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Design of large Cantilevers in seismic zone Iv and V
Posted March 20th, 2009 by ajay1804
Project: | www.sefindia.org |
Component: | Code |
Category: | support request |
Priority: | normal |
Assigned: | ajay1804 |
Status: | active |
Description
There is a perception that cantilevelrs are very critical in EQ zone IV and V, however on calculation of Seismic forces using BIS 1893-2002 clause 7.12.2.2 the Ah comes to only 0.20W for Sa/g of 2.5 anf I as 1 and R as 5 for the structure and forces as 10/3 Ah i.e.2/3Ah with R =1, in such a scenerio and the load combination as per codes the effect of EQ forces in normal cantivers i.e. say up to 4-5 meters,is minimal and the combination of 1.5 DL+1.5 LL is becoming critcal for cantilever, which is against the prevailing perception. Please advice whether I am wrongly understanding the codal provisions or how to calculate EQ forces in case of Cantilevers.