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RE: Download Comments On Proposed Draft Provisions For Seismic Design Of ESR

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First a couple of questions: Are the seismic force levels that these
R-values are used with at strength-levels or at service-levels? And are
any added factors applied, such as Importance Factors, for water storage

I would agree that R=1.50 seems rather low. But there is still much
debate about how high R-values should go for such structures. 

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)

	From: Bhavin Shah [mailto:vmscons(--nospam--at)] 
	Sent: Wednesday, November 24, 2004 4:54 AM
	To: seaint(--nospam--at)
	Subject: Download Comments On Proposed Draft Provisions For
Seismic Design Of ESR
	( Gujarat State Centre )
	Web :,  e-mail: secy(--nospam--at)
	Date : 24-11-2004
	Message for Structural Engineers in India 
	Dear Sir,
	Sub :Download Comments On Proposed Draft Provisions For Seismic
Design Of Elevated  Tanks supported on R.C. shafts       
	This has reference to the proposed draft code for seismic
analysis & design of E.S.R.. The same may be downloaded by going to : It has been observed that response reduction factor for
tank supported on the shaft is reduced to 1.5. This leads to increase in
earthquake force in the water tanks by almost 3 times than as calculated
by IS:1893-1984. This is the opinion of the authors of the code that
water tanks supported on the shaft do not perform well during earthquake
as compared to that supported on beam - column staging. On the other
hand, several tanks with shafts have performed well in the recent
	The meeting was organised by Indian Association of Structural
Engineers (Gujarat State Centre) for discussions on the above mentioned
subject on 25-09-04. Based on the meeting, the report is prepared. The
report has been submitted to IAStructE Head Office (New Delhi) for
further submission to Bureau of Indian Standards.
	The report may be downloaded by going to : 
	Kindly go through the same and send us your
views/suggestions/questions at : Iaseforum(--nospam--at) 
	Bhavin Shah
	Hon. Secretary
	Indian Association of Structural Engineers, Gujarat Centre

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