I've made the slab base (with the required thickness), attached it to the roof slab with 4 columns.. i've manually calculated all the loadings possible, and assigned them to the roof slab (as a floor load), and the self weight for all members.. but i get an error which says the structure is unstable.... please give me ur suggestions on how to move about with the model..
thanks in advance
heres the file
i'm not able to create a picture of the model as exactl how it appears in real.. i'm having difficulties in assigning the columns at a distance of 1.5 inches from the corners of the bottom slab !!! please guide me how to move about the task,, i'm new to staad ..
Would you attach your staad file?