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Drift limitations in IS 16700

 
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chiragchaudhari
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Joined: 18 Jul 2017
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PostPosted: Wed Mar 14, 2018 3:35 am    Post subject: Drift limitations in IS 16700 Reply with quote

Dear sir/ Madam,

As per section 5.4.1 the lateral drift ratio (under factored wind load combinations) is given as H/500 and for single story it is given as h/400. For earthquake load (factored) combinations it is given as h/250.
H=total ht of the building
h=ht of one story


My question is for which unfactored wind load combinations and factored earthquake load combinations the drift value is to be considered. 


Also does H/500 states the limitation for maximum deflection of building as tatal height is considered. 


Kindly give some clarity on this clause....


Regards,
Chirag Chaudhari.

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alpa_sheth
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Joined: 26 Jan 2003
Posts: 259
Location: Mumbai

PostPosted: Wed Mar 14, 2018 5:27 am    Post subject: Drift limitations in IS 16700 Reply with quote

​The use of factored/unfactored needs to be understood. 


Unfactored wind  loads are easy to understand. They are the design wind loads without any load combination factors of 1.5, 1.2 etc. 
Factored  earthquake loads are also the design earthquake loads without any load combination factors of 1.5, 1.2 etc. The reason they are called "factored" loads is because you have used a response reduction factor R to factor down the earthquake force levels.


regards,
A






​

best regards,Alpa Sheth 




VMS Consultants Pvt. Ltd.
83 Sakhar Bhavan
230 Nariman Pt. 
Mumbai 400021
Tel: 91-22-61725200
w (vmsb@vakilmehtasheth.com)ww.vakilmehtasheth.com










On Wed, Mar 14, 2018 at 9:06 AM, chiragchaudhari <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear sir/ Madam,

As per section 5.4.1 the lateral drift ratio (under factored wind load combinations) is given as H/500 and for single story it is given as h/400. For earthquake load (factored) combinations it is given as h/250.
H=total ht of the building
h=ht of one story


My question is for which unfactored wind load combinations and factored earthquake load combinations the drift value is to be considered. 


Also does H/500 states the limitation for maximum deflection of building as tatal height is considered. 


Kindly give some clarity on this clause....


Regards,
Chirag Chaudhari.
     



     



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hemalmistry
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Joined: 01 Jul 2009
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PostPosted: Wed Mar 14, 2018 5:52 am    Post subject: Reply with quote

Alpa mam, Thanx for the clarification regarding "factored seismic load", as generally we mean factored load combinations are load combinations with PSF for loads applied to each load.

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hemal
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chiragchaudhari
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Joined: 18 Jul 2017
Posts: 3

PostPosted: Wed Mar 14, 2018 6:53 am    Post subject: Drift limitations in IS 16700 Reply with quote

Thank you for making it more clear.

I have one more query.
The same clause suggest the relaxation of drift limitation to h/400 for single story.
What exactly it is for..??


Regards,
Chirag Chaudhari


On Wed, Mar 14, 2018, 11:03 alpa_sheth <forum@sefindia.org (forum@sefindia.org)> wrote:

[quote]            Ã¢â‚¬â€¹The use of factored/unfactored needs to be understood. 


Unfactored wind  loads are easy to understand. They are the design wind loads without any load combination factors of 1.5, 1.2 etc. 
Factored  earthquake loads are also the design earthquake loads without any load combination factors of 1.5, 1.2 etc. The reason they are called "factored" loads is because you have used a response reduction factor R to factor down the earthquake force levels.


regards,
A






​

best regards,Alpa Sheth 


]https://drive.google.com/uc?id=0B4BXntATUzLzTWdET1NuSmJtUTA&export=download">

VMS Consultants Pvt. Ltd.
83 Sakhar Bhavan
230 Nariman Pt. 
Mumbai 400021
Tel: 91-22-61725200
w (vmsb@vakilmehtasheth.com (vmsb@vakilmehtasheth.com))ww.vakilmehtasheth.com










On Wed, Mar 14, 2018 at 9:06 AM, chiragchaudhari forum@sefindia.org (forum@sefindia.org))> wrote:
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