02-05-2009, 12:28 AM
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:
ETABS - seismic weight Current time: 04-16-2021, 01:41 AM |
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ETABS - seismic weight
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02-05-2009, 12:28 AM
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:
02-05-2009, 02:20 PM
Mass source :
Full dead load some percentage of live load as per code.
02-06-2009, 12:36 AM
02-14-2009, 11:01 PM
ETABS newbies: check your definition of seismic mass source; it may be doubling your self-weight. :D
02-27-2009, 04:12 PM
(This post was last modified: 02-27-2009, 04:24 PM by robertsas. Edit Reason: )
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
02-27-2009, 06:29 PM
02-28-2009, 01:34 AM
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
02-28-2009, 01:44 AM
(This post was last modified: 02-28-2009, 01:50 AM by robertsas. Edit Reason: )
yes..
any other opinion from other member ? regards, robertsasmita
05-12-2009, 04:45 PM
(This post was last modified: 05-12-2009, 04:47 PM by piscesa. Edit Reason: )
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
05-18-2009, 08:34 AM
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).
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