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for normal structure for instance the building with 10 levels., should we use self-weight on three direction or just Y direction?Note that earthquake load accrue on X and Z direction.
It is always preferrable to have the mass defined on all the three possible directions of vibrations. That the structure is stiffer in the vertical direction, and the probable chance of having the mass vibrating in the vertical direction is only possible in the higher modes which is almost non-practical to consider - will be automatically taken care of by STAAD. You only need to ensure that the lateral modesof vibration reaches at least a mass participation value of 90%.
FWIW, you would be better served posting inquiries like this in the community's forum -- click on the Forum tab and then "New Post".
Is there any command in Staad " CALCULATE NATURAL FREQUENCY" AS STATED in one of the above postings. Please clarify.
can any one teach me staad pro ,,,,,for loading using IS codes
Please any one tale me when I define the mass on the all three direction i.e. X, Y, Z for 3D vertical cantilever stack of height 100m and applied response spectra for horizontal X-direction , then how the bending moment and shear force for another direction are come to zero. Whether STAAD automatically considered displacement in another horizontal direction to zero while calculating moment for response in X direction. Is it ant theoretical support is available to prove the same.