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Opening email for Tall Bldgs e-Conference
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Dr. N. Subramanian
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PostPosted: Mon Nov 19, 2012 2:25 am    Post subject: Opening email for Tall Bldgs e-Conference Reply with quote

Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to the e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which 27.8 percent live in urban areas. India’s National Report for Habitat estimated that by 2021, the country would face a housing shortage of 44.9 million units.It is estimated that for urban housing alone, the housing shortage is about 7.57 million units. At the same time, the available land is limited. Already many cities are growing at an alaraming rate and agricultural lands are being converted to plots for buildings. If it continues, India will face a painful food crisis. Already Chennai is facing problems of getting food products from far off places. The only solution to solve all these problems is to go in for high rise buildings. Already More than 2500 high-rise buildings are already constructed in Mumbai Metropolitan Region (MMR). In addition more than thousand mid-rises exists already in the city. Mumbai is undergoing a massive construction boom, with thousands of high-rises and more than 15 super-talls under construction. Delhi and its surrounding regions are witnessing huge construction activities with 1500 already constructed high-rises in National Capital Region (NCR). Kolkata is emerging as India's next skyscraper city with 600 existing highrises and many more under construction[www.emporis.com] Hyderabad & Bangalore are also catching up and soon will match up with a city like Mumbai. High-rises are also becoming common in Chennai in recent times after the removal of height restrictions on constructions (height was restricted to 40 m until 1998). Many well known Builders of Mumbai (e.g. Hiranandani) are now constructing high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011 will dampen the construction of tall buildings all over the world. But on the contrary several super-tall buildings are being constructed all over the world, and India is not an exception (Now China has more super-tall towers than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with a height of 254m (833 ft) are the current tallest buildings in India and much taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and maintained properly. Though the analysis of these structures can be done easily with the available commercial software programs, other aspects need careful study. Unlike low rise structures, high rises may be more affected due to accidental loads.The wind loads may be affected by the configurations. Different structural systems have to be adopted for resisting wind loads effectively. Wind tower testing may be necessary to accurately determine the wind loads. Similarly earthquake as well as blast loads (due to the increased terrorist activities throughout the world) also need careful analysis, design and detailing. the construction of columns may need very high strength concrete which at the same time need to behave in a ductile manner (Interestingly reinforced/pre-stressed concrete is the choice for most of the recent high rise buildings). Vertical Transportation, as well as designing of transportation around the buildings and cleaning of windows of tall buildings also require attention. Water and Energy requirements may also pose problems. Current trend is to construct these buildings as 'green' buildings. There are also a number of other problems, which I have not mentioned in this short note. Hope we will discuss about many of these problems and their solutions in the coming week and that all of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

Maryland, USA


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SHEREEF M I
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PostPosted: Mon Nov 19, 2012 4:17 am    Post subject: Reply with quote

good morning sir....i am a final year structural engineering student.now i am doing my final project, topic" ANALYSIS OF COMPOSITE TALL BUILDING SUBJECTED TO SEISMIC AND WIND FORCES" in SERC chennai...sir is it possible to collect study materials from this site....if yes what is the procedure....thanking you..
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PostPosted: Mon Nov 19, 2012 5:16 am    Post subject: Reply with quote

Dear Er Shereef,

You should have posted it in General Discussions and not on this e-conf. SERC, Chennai is having a very good library- please read books/journals there. SERC Librarian will also be of great help.

Best wishes,
NS
SHEREEF M I wrote:
good morning sir....i am a final year structural engineering student.now i am doing my final project, topic" ANALYSIS OF COMPOSITE TALL BUILDING SUBJECTED TO SEISMIC AND WIND FORCES" in SERC chennai...sir is it possible to collect study materials from this site....if yes what is the procedure....thanking you..
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PostPosted: Mon Nov 19, 2012 9:50 am    Post subject: Opening email for Tall Bldgs e-Conference Reply with quote

Dear Dr. N. Subramania,

What are limitations for later drifts of high rise building?
Can you please mention any reference from ASCE/ACI/IS standards?


Regards
Waqar


On 11/19/12, Dr. N. Subramanian <forum@sefindia.org> wrote:
Quote:
Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to the
e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which
27.8 percent live in urban areas. Indiaís National Report for Habitat
estimated that by 2021, the country would face a housing shortage of 44.9
million units.It is estimated that for urban housing alone, the housing
shortage is about 7.57 million units. At the same time, the available land
is limited. Already many cities are growing at an alaraming rate and
agricultural lands are being converted to plots for buildings. If it
continues, India will face a painful food crisis. Already Chennai is facing
problems of getting food products from far off places. The only solution to
solve all these problems is to go in for high rise buildings. Already More
than 2500 high-rise buildings are already constructed in Mumbai Metropolitan
Region (MMR). In addition more than thousand mid-rises exists already in the
city. Mumbai is undergoing a massive construction boom, with thousands of
high-rises and more than 15 super-talls under construction. Delhi and its
surrounding regions are witnessing huge construction activities with 1500
already constructed high-rises in National Capital Region (NCR). Kolkata is
emerging as India's next skyscraper city with 600 existing highrises and
many more under construction[www.emporis.com] Hyderabad & Bangalore are also
catching up and soon will match up with a city like Mumbai. High-rises are
also becoming common in Chennai in recent times after the removal of height
restrictions on constructions (height was restricted to 40 m until 1998).
Many well known Builders of Mumbai (e.g. Hiranandani) are now constructing
high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011 will
dampen the construction of tall buildings all over the world. But on the
contrary several super-tall buildings are being constructed all over the
world, and India is not an exception (Now China has more super-tall towers
than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with a
height of 254m (833 ft) are the current tallest buildings in India and much
taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and
maintained properly. Though the analysis of these structures can be done
easily with the available commercial software programs, other aspects need
careful study. Unlike low rise structures, high rises may be more affected
due to accidental loads.The wind loads may be affected by the
configurations. Different structural systems have to be adopted for
resisting wind loads effectively. Wind tower testing may be necessary to
accurately determine the wind loads. Similarly earthquake as well as blast
loads (due to the increased terrorist activities throughout the world) also
need careful analysis, design and detailing. the construction of columns may
need very high strength concrete which at the same time need to behave in a
ductile manner (Interestingly reinforced/pre-stressed concrete is the choice
for most of the recent high rise buildings). Vertical Transportation, as
well as designing of transportation around the buildings and cleaning of
windows of tall buildings also require attention. Water and Energy
requirements may also pose problems. Current trend is to construct these
buildings as 'green' buildings. There are also a number of other problems,
which I have not mentioned in this short note. Hope we will discuss about
many of these problems and their solutions in the coming week and that all
of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

(http://www.oup.co.in/search_detail.php?id=144559) Maryland, USA
(http://www.sefindia.org/)









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PostPosted: Mon Nov 19, 2012 1:53 pm    Post subject: Opening email for Tall Bldgs e-Conference Reply with quote

This is good initiaion, india needs guidance & technical support at this juncture


Signature: Y.P.R.Chodary, Hyderabad

-
Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to the e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which 27.8 percent live in urban areas. India√ʬĬôs National Report for Habitat estimated that by 2021, the country would face a housing shortage of 44.9 million units.It is estimated that for urban housing alone, the housing shortage is about 7.57 million units. At the same time, the available land is limited. Already many cities are growing at an alaraming rate and agricultural lands are being converted to plots for buildings. If it continues, India will face a painful food crisis. Already Chennai is facing problems of getting food products from far off places. The only solution to solve all these problems is to go in for high rise buildings. Already More than 2500 high-rise buildings are already constructed in Mumbai Metropolitan Region (MMR). In addition more than thousand mid-rises exists already in the city. Mumbai is undergoing a massive construction boom, with thousands of high-rises and more than 15 super-talls under construction. Delhi and its surrounding regions are witnessing huge construction activities with 1500 already constructed high-rises in National Capital Region (NCR). Kolkata is emerging as India's next skyscraper city with 600 existing highrises and many more under construction[www.emporis.com] Hyderabad & Bangalore are also catching up and soon will match up with a city like Mumbai. High-rises are also becoming common in Chennai in recent times after the removal of height restrictions on constructions (height was restricted to 40 m until 1998). Many well known Builders of Mumbai (e.g. Hiranandani) are now constructing high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011 will dampen the construction of tall buildings all over the world. But on the contrary several super-tall buildings are being constructed all over the world, and India is not an exception (Now China has more super-tall towers than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with a height of 254m (833 ft) are the current tallest buildings in India and much taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and maintained properly. Though the analysis of these structures can be done easily with the available commercial software programs, other aspects need careful study. Unlike low rise structures, high rises may be more affected due to accidental loads.The wind loads may be affected by the configurations. Different structural systems have to be adopted for resisting wind loads effectively. Wind tower testing may be necessary to accurately determine the wind loads. Similarly earthquake as well as blast loads (due to the increased terrorist activities throughout the world) also need careful analysis, design and detailing. the construction of columns may need very high strength concrete which at the same time need to behave in a ductile manner (Interestingly reinforced/pre-stressed concrete is the choice for most of the recent high rise buildings). Vertical Transportation, as well as designing of transportation around the buildings and cleaning of windows of tall buildings also require attention. Water and Energy requirements may also pose problems. Current trend is to construct these buildings as 'green' buildings. There are also a number of other problems, which I have not mentioned in this short note. Hope we will discuss about many of these problems and their solutions in the coming week and that all of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

(http://www.oup.co.in/search_detail.php?id=144559) Maryland, USA
(http://www.sefindia.org/)








"Dr. N. Subramanian" <forum@sefindia.org> wrote:

Quote:
Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to the e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which 27.8 percent live in urban areas. India√ʬĬôs National Report for Habitat estimated that by 2021, the country would face a housing shortage of 44.9 million units.It is estimated that for urban housing alone, the housing shortage is about 7.57 million units. At the same time, the available land is limited. Already many cities are growing at an alaraming rate and agricultural lands are being converted to plots for buildings. If it continues, India will face a painful food crisis. Already Chennai is facing problems of getting food products from far off places. The only solution to solve all these problems is to go in for high rise buildings. Already More than 2500 high-rise buildings are already constructed in Mumbai Metropolitan Region (MMR). In addition more than thousand mid-rises exists already in the city. Mumbai is undergoing a massive construction boom, with thousands of high-rises and more than 15 super-talls under construction. Delhi and its surrounding regions are witnessing huge construction activities with 1500 already constructed high-rises in National Capital Region (NCR). Kolkata is emerging as India's next skyscraper city with 600 existing highrises and many more under construction[www.emporis.com] Hyderabad & Bangalore are also catching up and soon will match up with a city like Mumbai. High-rises are also becoming common in Chennai in recent times after the removal of height restrictions on constructions (height was restricted to 40 m until 1998). Many well known Builders of Mumbai (e.g. Hiranandani) are now constructing high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011 will dampen the construction of tall buildings all over the world. But on the contrary several super-tall buildings are being constructed all over the world, and India is not an exception (Now China has more super-tall towers than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with a height of 254m (833 ft) are the current tallest buildings in India and much taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and maintained properly. Though the analysis of these structures can be done easily with the available commercial software programs, other aspects need careful study. Unlike low rise structures, high rises may be more affected due to accidental loads.The wind loads may be affected by the configurations. Different structural systems have to be adopted for resisting wind loads effectively. Wind tower testing may be necessary to accurately determine the wind loads. Similarly earthquake as well as blast loads (due to the increased terrorist activities throughout the world) also need careful analysis, design and detailing. the construction of columns may need very high strength concrete which at the same time need to behave in a ductile manner (Interestingly reinforced/pre-stressed concrete is the choice for most of the recent high rise buildings). Vertical Transportation, as well as designing of transportation around the buildings and cleaning of windows of tall buildings also require attention. Water and Energy requirements may also pose problems. Current trend is to construct these buildings as 'green' buildings. There are also a number of other problems, which I have not mentioned in this short note. Hope we will discuss about many of these problems and their solutions in the coming week and that all of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

(http://www.oup.co.in/search_detail.php?id=144559) Maryland, USA
(http://www.sefindia.org/)








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PostPosted: Tue Nov 20, 2012 1:54 am    Post subject: Opening email for Tall Bldgs e-Conference Reply with quote

Dear Moderators,

As a person involved in IS:1893-2002, I would like attention drawn to
the inadequacies
for really tall buildings.

Since modelling was misused earlier [use of 1984 version], to obtain a
fictitious long period and thereby a reduced base shear, the punitive
clause was used to anchor at a empirical short period.

If, as I expect, a more accurate modelling would be used nowadays, the
punitive clause should now be deleted.

I also feel that the value of R as FIVE, cannot be achieved. Such
large reduction factor versus deflection ductility using results of
the Newmark/Blume SDOF model is not applicable. a Value of "R" of the
order of 5 would require a much larger deflection ductility
Experiments on models of RC frames have shown much less ductility

best wishes
ARC

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PostPosted: Tue Nov 20, 2012 1:23 pm    Post subject: Re: Opening email for Tall Bldgs e-Conference Reply with quote

Dear Er Waqar,

Please refer Er Alpa's email in which she has stated the drift limits for wind and EQ are different in Indian code and due to that Wind only governs in serviceability limit states.

I am giving the following data based on a PPP presentation by Thornton Tomasetti, a leading consulting firm in Tall buildings.

  • Overall Building: No P-Delta
          US (10-20 year wind) H/400 to H/500
  • Interstorey Wind Drift: No P-Delta
            US (10-20 year) h/350
  • Interstorey Seismic drift: with P-Delta
          Inelastic drift < 0.01h-0.02h (h/100-
h/50)

Best wishes

NS
engr.malikwaqar at gma... wrote:
Dear Dr. N. Subramania,

What are limitations for later drifts of high rise building?
Can you please mention any reference from ASCE/ACI/IS standards?


Regards
Waqar


On 11/19/12, Dr. N. Subramanian <forum> wrote:
Quote:
Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to the
e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which
27.8 percent live in urban areas. Indiaís National Report for Habitat
estimated that by 2021, the country would face a housing shortage of 44.9
million units.It is estimated that for urban housing alone, the housing
shortage is about 7.57 million units. At the same time, the available land
is limited. Already many cities are growing at an alaraming rate and
agricultural lands are being converted to plots for buildings. If it
continues, India will face a painful food crisis. Already Chennai is facing
problems of getting food products from far off places. The only solution to
solve all these problems is to go in for high rise buildings. Already More
than 2500 high-rise buildings are already constructed in Mumbai Metropolitan
Region (MMR). In addition more than thousand mid-rises exists already in the
city. Mumbai is undergoing a massive construction boom, with thousands of
high-rises and more than 15 super-talls under construction. Delhi and its
surrounding regions are witnessing huge construction activities with 1500
already constructed high-rises in National Capital Region (NCR). Kolkata is
emerging as India's next skyscraper city with 600 existing highrises and
many more under construction[www.emporis.com] Hyderabad & Bangalore are also
catching up and soon will match up with a city like Mumbai. High-rises are
also becoming common in Chennai in recent times after the removal of height
restrictions on constructions (height was restricted to 40 m until 1998).
Many well known Builders of Mumbai (e.g. Hiranandani) are now constructing
high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011 will
dampen the construction of tall buildings all over the world. But on the
contrary several super-tall buildings are being constructed all over the
world, and India is not an exception (Now China has more super-tall towers
than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with a
height of 254m (833 ft) are the current tallest buildings in India and much
taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and
maintained properly. Though the analysis of these structures can be done
easily with the available commercial software programs, other aspects need
careful study. Unlike low rise structures, high rises may be more affected
due to accidental loads.The wind loads may be affected by the
configurations. Different structural systems have to be adopted for
resisting wind loads effectively. Wind tower testing may be necessary to
accurately determine the wind loads. Similarly earthquake as well as blast
loads (due to the increased terrorist activities throughout the world) also
need careful analysis, design and detailing. the construction of columns may
need very high strength concrete which at the same time need to behave in a
ductile manner (Interestingly reinforced/pre-stressed concrete is the choice
for most of the recent high rise buildings). Vertical Transportation, as
well as designing of transportation around the buildings and cleaning of
windows of tall buildings also require attention. Water and Energy
requirements may also pose problems. Current trend is to construct these
buildings as 'green' buildings. There are also a number of other problems,
which I have not mentioned in this short note. Hope we will discuss about
many of these problems and their solutions in the coming week and that all
of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

(http://www.oup.co.in/search_detail.php?id=144559) Maryland, USA
(http://www.sefindia.org/)









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PostPosted: Wed Nov 21, 2012 8:48 am    Post subject: Opening email for Tall Bldgs e-Conference Reply with quote

hi all†

when we are discussing the tall buildings , would it not be prudent to discuss as to when the buildings can be classified as tall ?


1 , Is it only with respect to height , if so what height would be ideal to call it tall ?


2, any other parameter like height to width ratio etc are to be considered as well†


regards


vasudevan†

On Mon, Nov 19, 2012 at 8:00 AM, Dr. N. Subramanian <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to the e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which 27.8 percent live in urban areas. India’s National Report for Habitat estimated that by 2021, the country would face a housing shortage of 44.9 million units.It is estimated that for urban housing alone, the housing shortage is about 7.57 million units. At the same time, the available land is limited. Already many cities are growing at an alaraming rate and agricultural lands are being converted to plots for buildings. If it continues, India will face a painful food crisis. Already Chennai is facing problems of getting food products from far off places. The only solution to solve all these problems is to go in for high rise buildings. Already More than 2500 high-rise buildings are already constructed in Mumbai Metropolitan Region (MMR). In addition more than thousand mid-rises exists already in the city. Mumbai is undergoing a massive construction boom, with thousands of high-rises and more than 15 super-talls under construction. Delhi and its surrounding regions are witnessing huge construction activities with 1500 already constructed high-rises in National Capital Region (NCR). Kolkata is emerging as India's next skyscraper city with 600 existing highrises and many more under construction[www.emporis.com] Hyderabad & Bangalore are also catching up and soon will match up with a city like Mumbai. High-rises are also becoming common in Chennai in recent times after the removal of height restrictions on constructions (height was restricted to 40 m until 1998). Many well known Builders of Mumbai (e.g. Hiranandani) are now constructing high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011 will dampen the construction of tall buildings all over the world. But on the contrary several super-tall buildings are being constructed all over the world, and India is not an exception (Now China has more super-tall towers than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with a height of 254m (833 ft) are the current tallest buildings in India and much taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and maintained properly. Though the analysis of these structures can be done easily with the available commercial software programs, other aspects need careful study. Unlike low rise structures, high rises may be more affected due to accidental loads.The wind loads may be affected by the configurations. Different structural systems have to be adopted for resisting wind loads effectively. Wind tower testing may be necessary to accurately determine the wind loads. Similarly earthquake as well as blast loads (due to the increased terrorist activities throughout the world) also need careful analysis, design and detailing. the construction of columns may need very high strength concrete which at the same time need to behave in a ductile manner (Interestingly reinforced/pre-stressed concrete is the choice for most of the recent high rise buildings). Vertical Transportation, as well as designing of transportation around the buildings and cleaning of windows of tall buildings also require attention. Water and Energy requirements may also pose problems. Current trend is to construct these buildings as 'green' buildings. There are also a number of other problems, which I have not mentioned in this short note. Hope we will discuss about many of these problems and their solutions in the coming week and that all of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

Maryland, USA

     



     



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PostPosted: Thu Nov 22, 2012 9:27 am    Post subject: Opening email for Tall Bldgs e-Conference Reply with quote

sir
can u suggest me any alternative for sand because sand is unavailable
in punjab and
site work is not going on
fine sand for plastering
and coarse sand for concrete mix
please reply as soon as possible

On 11/20/12, engr.malikwaqar at gma... <forum@sefindia.org> wrote:
[quote]Dear Dr. N. Subramania,

What are limitations for later drifts of high rise building?
Can you please mention any reference from ASCE/ACI/IS standards?


Regards
Waqar


On 11/19/12, Dr. N. Subramanian <forum@sefindia.org> wrote:

Quote:
Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to
the
e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which
27.8 percent live in urban areas. Indiaís National Report for Habitat
estimated that by 2021, the country would face a housing shortage of 44.9
million units.It is estimated that for urban housing alone, the housing
shortage is about 7.57 million units. At the same time, the available
land
is limited. Already many cities are growing at an alaraming rate and
agricultural lands are being converted to plots for buildings. If it
continues, India will face a painful food crisis. Already Chennai is
facing
problems of getting food products from far off places. The only solution
to
solve all these problems is to go in for high rise buildings. Already
More
than 2500 high-rise buildings are already constructed in Mumbai
Metropolitan
Region (MMR). In addition more than thousand mid-rises exists already in
the
city. Mumbai is undergoing a massive construction boom, with thousands of
high-rises and more than 15 super-talls under construction. Delhi and its
surrounding regions are witnessing huge construction activities with 1500
already constructed high-rises in National Capital Region (NCR). Kolkata
is
emerging as India's next skyscraper city with 600 existing highrises and
many more under construction[www.emporis.com] Hyderabad & Bangalore are
also
catching up and soon will match up with a city like Mumbai. High-rises
are
also becoming common in Chennai in recent times after the removal of
height
restrictions on constructions (height was restricted to 40 m until 1998).
Many well known Builders of Mumbai (e.g. Hiranandani) are now
constructing
high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011
will
dampen the construction of tall buildings all over the world. But on the
contrary several super-tall buildings are being constructed all over the
world, and India is not an exception (Now China has more super-tall
towers
than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with
a
height of 254m (833 ft) are the current tallest buildings in India and
much
taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and
maintained properly. Though the analysis of these structures can be done
easily with the available commercial software programs, other aspects
need
careful study. Unlike low rise structures, high rises may be more
affected
due to accidental loads.The wind loads may be affected by the
configurations. Different structural systems have to be adopted for
resisting wind loads effectively. Wind tower testing may be necessary to
accurately determine the wind loads. Similarly earthquake as well as
blast
loads (due to the increased terrorist activities throughout the world)
also
need careful analysis, design and detailing. the construction of columns
may
need very high strength concrete which at the same time need to behave in
a
ductile manner (Interestingly reinforced/pre-stressed concrete is the
choice
for most of the recent high rise buildings). Vertical Transportation, as
well as designing of transportation around the buildings and cleaning of
windows of tall buildings also require attention. Water and Energy
requirements may also pose problems. Current trend is to construct these
buildings as 'green' buildings. There are also a number of other
problems,
which I have not mentioned in this short note. Hope we will discuss about
many of these problems and their solutions in the coming week and that
all
of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

(http://www.oup.co.in/search_detail.php?id=144559) Maryland, USA
(http://www.sefindia.org/)










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B.V.Harsoda
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Joined: 19 Jan 2009
Posts: 2291
Location: RAJKOT,GUJARAT, INDIA

PostPosted: Thu Nov 22, 2012 4:40 pm    Post subject: Re: Opening email for Tall Bldgs e-Conference Reply with quote

For Alternative of sand refer below links:-
http://www.sefindia.org/forum/viewtopic.php?t=11702
http://www.sefindia.org/forum/viewtopic.php?t=11667

Regards,
Er. B. V. Harsoda

[quote="sankalp marwaha"]sir
can u suggest me any alternative for sand because sand is unavailable
in punjab and
site work is not going on
fine sand for plastering
and coarse sand for concrete mix
please reply as soon as possible

On 11/20/12, engr.malikwaqar at gma... <forum> wrote:
Quote:
Dear Dr. N. Subramania,

What are limitations for later drifts of high rise building?
Can you please mention any reference from ASCE/ACI/IS standards?


Regards
Waqar


On 11/19/12, Dr. N. Subramanian <forum> wrote:

Quote:
Hi All,

On behalf of the Structural Engineering Forum of India, I welcome all to
the
e-conference on Tall Buildings.

The population of India as per 2001 Census is 1,027 million, out of which
27.8 percent live in urban areas. Indiaís National Report for Habitat
estimated that by 2021, the country would face a housing shortage of 44.9
million units.It is estimated that for urban housing alone, the housing
shortage is about 7.57 million units. At the same time, the available
land
is limited. Already many cities are growing at an alaraming rate and
agricultural lands are being converted to plots for buildings. If it
continues, India will face a painful food crisis. Already Chennai is
facing
problems of getting food products from far off places. The only solution
to
solve all these problems is to go in for high rise buildings. Already
More
than 2500 high-rise buildings are already constructed in Mumbai
Metropolitan
Region (MMR). In addition more than thousand mid-rises exists already in
the
city. Mumbai is undergoing a massive construction boom, with thousands of
high-rises and more than 15 super-talls under construction. Delhi and its
surrounding regions are witnessing huge construction activities with 1500
already constructed high-rises in National Capital Region (NCR). Kolkata
is
emerging as India's next skyscraper city with 600 existing highrises and
many more under construction[www.emporis.com] Hyderabad & Bangalore are
also
catching up and soon will match up with a city like Mumbai. High-rises
are
also becoming common in Chennai in recent times after the removal of
height
restrictions on constructions (height was restricted to 40 m until 1998).
Many well known Builders of Mumbai (e.g. Hiranandani) are now
constructing
high rises in the OMR area of Chennai.

Many thought that the terrorist attacks on WTC towers on Sept.11, 2011
will
dampen the construction of tall buildings all over the world. But on the
contrary several super-tall buildings are being constructed all over the
world, and India is not an exception (Now China has more super-tall
towers
than in USA). The Imperial Towers 1 & 2, completed in 2010 at Mumbai, with
a
height of 254m (833 ft) are the current tallest buildings in India and
much
taller buildings are in the offing.

Such high rise buildings have to be planned, designed, constructed, and
maintained properly. Though the analysis of these structures can be done
easily with the available commercial software programs, other aspects
need
careful study. Unlike low rise structures, high rises may be more
affected
due to accidental loads.The wind loads may be affected by the
configurations. Different structural systems have to be adopted for
resisting wind loads effectively. Wind tower testing may be necessary to
accurately determine the wind loads. Similarly earthquake as well as
blast
loads (due to the increased terrorist activities throughout the world)
also
need careful analysis, design and detailing. the construction of columns
may
need very high strength concrete which at the same time need to behave in
a
ductile manner (Interestingly reinforced/pre-stressed concrete is the
choice
for most of the recent high rise buildings). Vertical Transportation, as
well as designing of transportation around the buildings and cleaning of
windows of tall buildings also require attention. Water and Energy
requirements may also pose problems. Current trend is to construct these
buildings as 'green' buildings. There are also a number of other
problems,
which I have not mentioned in this short note. Hope we will discuss about
many of these problems and their solutions in the coming week and that
all
of you will be participating enthusiastically in the e-conference.

With best wishes,
Subramanian



Dr.N.Subramanian,Ph.D.,F.ASCE, M.ACI,

(http://www.oup.co.in/search_detail.php?id=144559) Maryland, USA
(http://www.sefindia.org/)










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