08-06-2010, 02:04 PM
(08-06-2010, 10:43 AM)imran Wrote: How do I find the critical load combination for moment in
Beam
Column and
slab in etabs
hi
for beams and slabs create a new load combination and use "envelope " option as combination type ans use as load all the desired loads combination for which you want to know the critical moments. this will produce a bending moment diagram that is an envelope of all the load combinations you defined.
For columns there is no such thing as critical load/forces/stresses ,, since columns are subject to axial+bending moment forces you have to create iteration diagrams. you cannot use, for example, the maximum axial load with the maximum moment because they, eventually, do not occur in the same load combination. create an iteration diagram a see if the combined loads from your analysis fail or not. see/search the forum for excel spreadsheets that can do this for you. hope i can helped.
PS.. ETABS, also creates/draws the iteration diagram for columns but i prefer to use excel sheets
regards