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vikram.jeet
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PostPosted: Fri May 14, 2021 4:44 am    Post subject: Reply with quote

Column pedestal provisions - Avoidance

To avoid extra cost/ work due to provision of pedestals, following need to be seen , I think

(I) Plinth beams must exist at Plinth level.

(ii) In lieu of extra cover for column reinforcement ,  cement plaster with water proof can also act as protective layer.

(iii) Applying Epoxy paint directly on rcc column in contact with soil.
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vikram.jeet
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PostPosted: Fri May 14, 2021 10:45 am    Post subject: Reply with quote

Column Pedestals for steel columns of sheds :-

These are provided to keep steel work above plinth level thereby avoiding rusting problems of structural steel .  
As  per definition, pedestal is a compression member  having effective length less than three times the least lateral dimension.
Reinforcement is provided to take Compression / tension with bending under gravity/ wind cases.
Anchor bolts of sufficient length as per design shall be provided for steel column base plate.
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vikram.jeet
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PostPosted: Fri May 14, 2021 12:06 pm    Post subject: Reply with quote

Rcc pedestals for shed steel columns

These are designed as vertical cantilevers subject to tension and bending  under wind case which generally governs the reinforcement .  Also subject to compression under gravity loading case but compressive stress is much less.

Reinforcements needs to be worked out for direct tension and bending and 0.15% needs to be added to the this worked out reinforcement . As per IS 456 ,  cl. 25.5.3.1 (h) - in case Longitudinal reinforcement is not taken into account in strength calcs. nominal Longitudinal reinforcements not less than 0.15% of X sec area shall be provided.
Other alternative method for reinforcement is by treating pedestal as short column . Reinforcement of 0.8 % may not be required and hence a hypothetical section ( annular) with reduced area can be designed to see stresses , and  reinforcement will be 0.8% of this reduced hypothetical area. This is in spirit of cl. 25.5.3.1 (b).
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vikram.jeet
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PostPosted: Fri May 14, 2021 12:39 pm    Post subject: Reply with quote

Column sections requiring reinforcement % less than 0.8% due large dimensions , especially in Bridges  / Buildings upper floors ( not top)

The design of such columns is attempted with hypothetical annular section of same outer dimensions but inner core hollow with steel reinforcement of 0.8% of this annular area. The column is checked for compression load and bending and if stresses are within permissible limit, the reinforcement of 0.8% of this reduced hypothetical annular area needs to be provided.
This will certainly be less than 0.8% of actual area.

Reference : IRC 21 cl  306.2.2
                      IS456 Cl.25.5.3.1(b)
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vikram.jeet
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PostPosted: Fri May 14, 2021 2:59 pm    Post subject: Reply with quote

Importance of training , seminars , special short term courses /workshops

At present , we are in technolgicallte advanced stage with virtual meetings, webinars and so on. It is also very useful. But ,  in past, such facility was not there .  But attending such events were highly productive.
Training of civil engineer s started from outset even  during student stage as a part of curriculum. The five years engineering course included  3 months training during summer vacations AND full semester of 6 months training in 4 th year. Students were sent to various construction and design organisations. It happened to be very useful .(Now the course is 4 yrs due to 10+2 curriculum at school level.).

University of Roorkee was at top on organising  specialised courses through their Deptt. of Continuing Education. Engineers were invited from Govt, Pvt , Local bodies even from abroad for short term courses of two to three weeks with all staying facilities at their hostels.
This practice needs to continue & physical presence has very different impact.
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PostPosted: Fri May 14, 2021 3:50 pm    Post subject: Reply with quote

Courses / Seminars

Physical attendence of such events has a everlasting effect. During the short term courses , engineers  used to stay in University dedicated Hostel and get chance to interact on various technical issues. Faculty of Roorkee University along with special experts invitees used to lecture on such design/ construction aspects related to the subject.

Course material was distributed as a practice / gesture to the attendees.

Virtual attendence is though short cut to such events, impact is definitely low.
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vikram.jeet
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PostPosted: Fri May 14, 2021 4:11 pm    Post subject: Reply with quote

Courses/Seminars

Following courses were attended at Roorkee University:

A short term course on Design & Construction of CABLE STAYED BRIDGES.  ( A two weeks Course , Some time during winter of 1983 , Professor Dr Prem Krishna was Course Director)

A Short term Course on Design of Machine Foundations .
( It was three weeks International course , sometime during summer of 1985 or so , Professor Dr Gopal Ranjan was Course Director)

Workshop on detailing of RCC structures
( A Two weeks Course , sometime during winter of 1987 or so)


These courses were organised by Continuing Education Department..

Probably , many here on sefi must have attended  large nos of such events at Roorkee.
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PostPosted: Sat May 15, 2021 2:38 am    Post subject: Reply with quote

Courses / Seminars

Some short courses attended in physical presence were:-

Seminar on Design & Construction of ISBT Flyovers on west bank of Yamuna bridge. ( This three days seminar was organised by CPWD at Vigyan Bhavan , New Delhi in probably 1990 or so)

Short course  on Design & Construction of Rigid & Flexible Pavement s .( This was organised by CRRI, Delhi at their HQ in the year 1996 )

Seminar on Water  for Survival
( This was organised by CBIP in collaboration with pvt , three day seminar at Hotel Chankya, Delhi)


Idea is that the organization in which engineers work, take care to send them to such events  in rotation so that it could benefit individual, organization and Nation .
Organising Deptt always keep budget to organise such events with nominal participation fee.
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vikram.jeet
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PostPosted: Sat May 15, 2021 2:44 am    Post subject: Reply with quote

Course / Seminar s

Last but not the least, sending to these continuing education events, also act as an incentive to hard working engineers . Every one likes to attend to enhance technical knowledge , and a booster to the confidence if designed.
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vikram.jeet
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PostPosted: Sat May 15, 2021 2:49 am    Post subject: Reply with quote

Course / Seminar s

Last but not the least, sending to these continuing education events, also act as an incentive to hard working engineers . Every one likes to attend to enhance technical knowledge , and a booster to the confidence  of DESIGNER.
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