Dear sir/mam,

Question

I am having a problem regarding SEISMIC LOADING according to IS 1893 2002/05. 
 I have given seismic definition- zone , RF , damping, and all those things which were asked. 
 I have also given selfweight factor as 1. Now, my que. is shall i define joint weights, member weights, floor weights, etc. in definitions? 
 if yes, then how to apply or find the values of all these weights? please help me out. 
 I have defined load case details as: 
 1. EQX- 1893 load x1 
 2.EQZ - 1893 load z1 
 3.DEAD LOAD- 1.1 self weight 
 1.2 floor load 
 1.3 brick wall load in form of UDL on beams 
 1.4 cantilever slab weight in form of UDL on beams 
 4.LIVE LOAD- live load -3 KN/ m^2 
 5. and all combinations according to IS 1893. 
 Please Please help me out...............................

Sye · Answer

Apart from the selfweight, any dead load or imposed load which are permanent in nature should be included as part of the seismic weight. You may include a certain percentage of the LL too. The input for the various types of seismic weights are explained in Technical Reference Manual section 5.31.2.5 titled IS:1893 (Part 1) 2002 & Part 4 (2005) Codes - Lateral Seismic Load

DSANJU · Answer

If this is a building model, you need to follow IS:1893 part -I. For industrial structures, you need to follow IS:1893-Part IV. If you want to provide seismic weight, you need to consider 100% of DL and either 25% of LL or 50% LL depending on the live load intensity as recommended in Table 8 of IS: 1893. In your case, it will be 25% of LL to be considered for seismic weight.