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you don,t need to delete the static load combinations. as long as you don't include them in the design combinations they don't affect your design. Dynamic analysis results are always positive while the reactions on the foundation due to earthquake can be either positive or negative. therefore...

Excuse me Brian, what do you mean by actual eigenvector? How can I work it out?

So is the number of eigenvalues actually the number of modes?

Hey friends I want to do a buckling analysis of a simply supported beam. I have defined the beam section as shell elements and the type of buckling analysis is Lanczos. How mush should be the number of Eigenvalues requested and after analysis how can I work out the buckling moments

I don't understant. but for sure you can't release the shear. foir moment it depends on the type of structure. steel or concrete

How much is the difference. some times there are some parts that are not connected to the floor diaphragms. their weight is considered in Auto seismic loads but not in diaphragm mass. its netter to compare it with the story mass.

1. As long as you run a P-delta analysis you don't need to be worry about if it is sway or non-sway since if it is nonsway then according to ACI-318 10.12 we have k=1 and Mc=Delta ns *M2 which is completely the same as etabs. if it is sway according to 10.13.4 the magnified delta s*Ms is the...

hi Etabs has an approach which you can see in it's help and tutorial. based on that it is assumed that you have run a P-Delta analysis. therefore K is always considered as 1 as well as delta s. Hope helps