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mehro SEFI Member
Joined: 26 Jan 2003 Posts: 6
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Posted: Tue Mar 25, 2003 5:49 pm Post subject: [None] |
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SUB: Load Combination of 1.5 (DL+EL) in clause 6.3 and Computation of Characteristic Value of Earthquake Force, as per clause 7.3 and 7.4 of IS:1893-2002.
The characteristic value of Earthquake Force is to be computed with “Seismic Weight” present on each floor, which according to clause 7.3, 7.4 and by definition 3.29, consists of full Dead Load (i.e characteristic Dead Load) plus an appropriate amount of specified Imposed Load assumed as a percentage of the characteristic value of Imposed Loads given in IS:875 for the particular occupancy of the building. This percentage of Imposed Load (25% or 50% as per table 8 of IS:1893-2002) is assumed such that it reasonably covers the weight associated with furniture, artifacts, stored materials, machinery and such components of the Imposed Load which are of a semi permanent nature and the weight of occupants, which in all probability is likely to exist in a building during an Earthquake. In majority of cases, this semi-permanent component of Imposed Load will be substantially higher than the weight of occupants during normal times.
UBC 1997 also specifies that seismic dead load,W,is total dead loads plus 25% of LL etc.
So the % of Live Load Specified in IS:1893-2002 must be considered along with Dead loads in seismic weight for the computation of Earthquake Load in the load combination 15(DL +EL).
From:
Prof. K.K. Nayar, S.C. Mehrotra, Mehro Consultants mehro@bol.net.in
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ishacon1 ...
Joined: 26 Jan 2003 Posts: 52
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Posted: Wed Mar 26, 2003 2:02 am Post subject: [None] |
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Prof. Nayar, & Mr. Mehrotra,
I am delighted to see your response. I hope this also goes to Prof arya alongwith our comments & solutions after the Workshop held in Jan. 2003. Regards,
V.P.Agarwal ishacon@vsnl.net
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roark.sol1 Diamond Sponsor
Joined: 26 Jan 2003 Posts: 70
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Posted: Wed Mar 26, 2003 5:01 am Post subject: [None] |
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Dear Prof. K.K. Nayar and S.C. Mehrotra,
Can you please guide me to the clause # and the page # in the UBC 1997 where it is stated that "seismic dead load,W,is total dead loads plus 25% of LL etc."
I would be obliged for the information, and please respond to the forum, so others can also have the information.
Thanks in advance.
Regards
Pankaj Gupta
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mishramk at hotmail.com Guest
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Posted: Thu Mar 27, 2003 2:42 pm Post subject: [None] |
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Gentlemen,
I too have a copy of UBC1997 and went thafter this posting of Pankaj but could not find the reffered clasue # and page #. It seems Prof Nayar and Mr. Mehrotra are awrea of it. Could they please drop a line informing the page and the clause number?
Thanks and regards,
M.K.Mishra New Delhi
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