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sangeeta_wij ...
Joined: 21 Apr 2016 Posts: 59
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Posted: Thu Feb 15, 2018 6:18 am Post subject: Liabilities for Clients in the wake of Revised Seismic Codes and the New Tall Buildings Code 16700 |
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From: Sangeeta Wij <sangeetawij@gmail.com (sangeetawij@gmail.com)>
Date: Sat, 20 Jan 2018 at 6:29 PM
Subject: Liabilities for Clients in the wake of Revised Seismic Codes and the New Tall Buildings Code 16700
To: <econf@sefindia.org (econf@sefindia.org)>
Dear SEFI friends and colleagues
My first post in 2018 and I wish all of you a very Happy New Year!
I have been reading the revised Codes-1893, 13920, 16700 and the Hospital Safety Guidelines from NDMA, and trying to discuss with the Code makers at BIS, and the Professors behind such significant changes. A Brief highlight of the same is as follows:
1. All Buildings in seismic zones are expected to follow regular geometries as per detailed recommendations in IS1893, as they have performed much better than Irregular structures in earthquakes.
2. In seismic Zones IV and V, buildings in 50-250 m range will be now NOT BUILT with Beams and Columns alone, and will preferably have RCC Structural walls, Tube in tube system etc as per 16700 Table 1.
3. Height to width of building as well as length to width of the building must now conform to Tables in 16700.
4. 13920, cl 1.1.2, clearly recommends against use of Precast, PT and Flat Slabs which are considered to be non ductile systems as against the monolithic RCC construction. Such systems maybe used only after adequate experimentation and a Non Linear Dynamic Analysis using Specialist Literature proves that they are as ductile as Monolithic RCC works.
5. Min grade of concrete for 16700 buildings is M30 and Max Grade is M70; couplers must replace lapping for column bars>=16mm
6. Minimum width of column is 20 times the dia of bars used in connecting beams; so for 25 dia bars, columns need to be at least 500mm wide, and Column strenght ratio with connecting beams should be greater than 1.4
7. Hospital Safety Guidelines goes a step further and makes it mandatory to design all buildings with RCC Shear Walls(to carry 100% Eq Shear, even in a steel structure), and PT,PEB,Precast and Flat Slabs have been totally prohibited, along with Stub Columns and large cantilevers or hidden beams.
8. All Critical Units of the Hospitals are thus required to conform to Immediate Occupancy Level and the rest to at least a Life Safety standard.
Will share with you in my next email how disappointed I feel to know that most Mega Projects are being constructed by teams of Clients/Architects/Structural Engineers happily ignorant of these important provisions.
Regards
Sangeeta Wij
spread awareness amongst our friends and colleagues in this Profession about how we need to take a fresh look at the way our industry works.
Best Regards
Sangeeta Wij
President,WISE India
Managing Partner
SD Engineering Consultants LLP
Vice President(North),Indian Association of Structural Engineers,
Fellow and Chartered Engineer, Institution of Engineers
H333 New Rajinder Nagar(Lower Ground Floor),
New Delhi-110060
01145128530
From: abhio [mailto:forum@sefindia.org (forum@sefindia.org)]
Sent: 20 May 2017 09:59
To: econf@sefindia.org (econf@sefindia.org)
Subject: [E-CONF] Re: Econf for RERA
Dear Sefians,
The impassioned statements made so far are unfortunately deviating from the topic of this e-conference, which ought to be limited to RERA. Market forces, fees, etc are topics we can discuss at our leisure later (in fact, there has been a lot of discussion on these issues already).
I would suggest that we ought to analyse the Act clause by clause to see how it affects us. I hope this should be acceptable.
One thing which struck me in Sangeetaji's post was a defect liability period of 5 years. Is this true as per the Act? If so, it is quite a change from the current practice where the Engineer is responsible for the design to the end of his/ her life!
Regards,
Abhijeet Oundhakar
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