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Re: problem with ETABS
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- Subject: Re: problem with ETABS
- From: "Michael Bryson" <mbryson(--nospam--at)bnflinc.com>
- Date: Tue, 04 Apr 2000 11:24:28 -0700
ETABS allows you to add a torque to your diaphragm and do load combinations on your load cases. Calculate the torques from the Static load distribution for each floor level: Txi = Fxi * eyi where Fxi is the force at level i for the x-direction eyi is the 5% eccentricity at level i in the y-direction Tyi = Fyi * exi where Fyi is the force at level i for the y-direction exi is the 5% eccentricity at level i in the x-direction Use these torques as separate load cases, for example: LC1 = Seismic in x-direction with no eccentricity LC2 = Seismic in y-direction with no eccentricity LC3 = Torque Txi only for y-direction eccentricity LC4 = Torque Tyi only for x-direction eccentricity LC5 = max. gravity loads LC6 = min. gravity loads The load combinations you would have to look at for walls and columns are: Comb1= |LC1| + |LC3| + LC6 max. tension for x-direction seismic Comb2= -( |LC1| + |LC3| ) +LC5 max. compression for x-direction seismic Comb3= |LC2| + |LC4| + LC6 max. tension for y-direction seismic Comb4= -( |LC2| + |LC4| ) +LC5 max. compression for y-direction seismic And for beams: Comb5= |LC1| + |LC3| + |LC5| max. moment for x-direction seismic Comb6= |LC2| + |LC4| + |LC5| max. moment for y-direction seismic You could do all this for dynamic analysis as well, but there are some options. HAKAN EZCAN wrote: > hi all.., i have a question to all who especially use > etabs program , we are using the structural analysis > program that own written about 20 years, i want to use > etabs but im very new on it and i dont know yet how to > fix that : in our code we must check the building for > quake loads when they effect center of gravity of > slabs and 0.05 percent eccentricity + and - for each > directions x ,y so we design the building for most > significant forces of total 12 load cases (3 of each > direction x,y -x,-y ) im workin on it, can any body > tellme how to calculate that on etabs , because etabs > has only 3 lateral load cases as ive seen > thanks :) > > __________________________________________________ > Do You Yahoo!? > Talk to your friends online with Yahoo! Messenger. > http://im.yahoo.com >
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