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+---- Thread: ETABS - seismic weight (/thread-230.html)
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ETABS - seismic weight - juice - 02-04-2009
Here's another tip to newbie ETABS user; always make a rough estimate of your seismic weight and compare this to what ETABS is giving you. :idea:
RE: ETABS - seismic weight - aslam - 02-05-2009
Mass source :
Full dead load
some percentage of live load as per code.
RE: ETABS - seismic weight - juice - 02-05-2009
(02-05-2009, 01:20 PM)aslam Wrote: Mass source :
Full dead load
some percentage of live load as per code.
hi aslam, try to make an estimate of your seismic weight outside of ETABS' results for you to get a good feel on what ETABS had outputted.
RE: ETABS - seismic weight - juice - 02-14-2009
ETABS newbies: check your definition of seismic mass source; it may be doubling your self-weight. :D
RE: ETABS - seismic weight - robertsas - 02-27-2009
My Opinion :
Separated your DEAD LOAD become Self Weight Dead Load and Super Imposed Dead Load.
The Dead Load for mass source is Super Imposed Dead Load (exclude Self Weight Dead Load).
I think double value of self weight because you do not separate the DEAD LOAD for calculate the mass source.
Please correct me if I wrong..
Regards,
robertsasmita
RE: ETABS - seismic weight - Elijah - 02-27-2009
Look at http://www.youtube.com/watch?v=JRvoU-35SL8
RE: ETABS - seismic weight - juice - 02-28-2009
if you intend to use the third option for mass source definition, you have to separate self weight from your superimposed dead load. and define your mass source as superimposed dead load, part of live load. any mass defined in the model will also be included internally by ETABS aside from the building self weight.
regards,
juice
RE: ETABS - seismic weight - robertsas - 02-28-2009
yes..
any other opinion from other member ?
regards,
robertsasmita
RE: ETABS - seismic weight - piscesa - 05-12-2009
Yups... that's right any additional dead load besides the selfweight needs to be separated to prevent double calculating of selfweight in mass source. Additional dead load which known as superimposed load should be added when third option of mass source is used with load factor 1 and life load should be added with load factor according to the spesific code (Usually 0.3).
CMIIW,
regards
RE: ETABS - seismic weight - iceman84 - 05-18-2009
I usually use the second option (from loads). All the coeficients are those given in the seismic codes (1 for dead loads and permanent loads and 0.4/0.3 for live loads). The third option can also be used (in this case only the dead load is 0, the rest of the loads have the same coeficients).