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IS800:2007 - Response Reduction Factor for Building system
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Hemalmodi
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Joined: 23 Jul 2009
Posts: 43

PostPosted: Thu Sep 30, 2010 10:27 pm    Post subject: BRBF cost benefits Reply with quote

Dear fellow SEFIans,
I just stumbled upon this old discussion, and found the discussion interesting because of two different questions that I thought were intriguing.

Most of the discussions eventually leads to the US codes and makes one wonder if there is an urgent need to update the Indian Standards and also ensure that they are implemented appropriately for public safety. Secondly, there seems to be a lot of interest in steel design, yet steel buildings are not built very often in India and makes me speculate if it is because concrete has been widely popular in the past and we donít have the required expertise to build steel structures or is it because of lack of availability of steel fabricators & erectors?

Anyways, to answer your question on the cost benefits, I have personally been involved in a project and recommended the use of BRBF system that saved about $10 million over a concrete shear wall system on a $550 million project, with an estimated half of that accounted for the use of BRBF over the traditional SCBF system. Unfortunately I donít have the exact cost of the steel, so it is actually a significant saving when you compare it to the cost of structural steel instead of the total project cost.

http://www.modernsteel.com/Uploads/Issues/August_2008/082008_30780_world_furniture_web.pdf
Hope it helps you have a slightly better perspective and look forward to an explanation for the two questions I mentioned above.

Hemal.
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R Khandekar
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Joined: 06 May 2010
Posts: 5

PostPosted: Fri Jul 03, 2020 8:44 am    Post subject: Re: IS800:2007 - Response Reduction Factor for Building syst Reply with quote

Does IS800 section 12 applicable for ductile detailing only? Can detailing of OMRF ignore Section-12?


Dr. N. Subramanian wrote:
Dear Er Pisal,

It is a very good question. Similar to RC frames, the detailing for special and ordinary Moment or Braced frames differ. IS 800 in section 12 give some detail. But AISC 341 (a free download from AISC web site-www.aisc.org) gives more details.

Many seminars on seismic design have concentrated primarily on moment frame systems. There are many cases in moderate to high seismic regions where the designer might prefer the lower cost and more efficient braced frame option.  AISC has developed a seminar that concentrates specifically on seismic braced frames. This AISC online seminar will focus on the design requirements in the 2005 AISC Seismic Provisions for Structural Steel pertaining to Special Concentrically Braced Frames (SCBF), Ordinary Concentrically Braced Frames (OCBF), and Buckling-Restrained Braced Frames (BRBF). Example problems and solutions for each type of the three braced frames will be covered.

The speaker is Rafael Sabelli, S.E., Principal at DASSE Design in San Francisco. He is a member of the AISC Task Committee on the Seismic Provisions for Structural Steel Buildings, and is the author of numerous publications on concentrically braced frames including analytical studies and design guides on buckling-restrained braced frames. He was the 2000 NEHRP Professional Fellow in Earthquake Hazard Reduction, and is the Past Chair of the Seismology Committee of the Structural Engineers Association of California.
Anyone interested may listen to this free online seminar from http://www.aisc.org/content.aspx?id=4520

Hope it is useful.

Regards,
Subramanian


Yogesh.Pisal wrote:
Dear Friends,

Refer Tb 23, IS800:2007

What is the difference in following terms
1. Ordinary Concentrically Braced Frames (OCBF) and Special Concentrically Braced Frames (SCBF)
2. Ordinary Moment Frame(OMF) and Special Moment Frame(SMF)

As per IS1893
OMRF is for the design and detailing as per IS456 and IS800
SMRF is for the design and detailing as per IS13920, IS4326, SP6. But I have doubt whether SP6 is valid for IS800:2007

Thanks & Regards,
Yogesh Pisal
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