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Torsional behaviors of asymmetric and irregular R.C.C structures are one of the most frequent sources of structural failure during strong ground motions. In this paper G+ 9 stories irregular shape building considered with mass, stiffness irregularity. For the evaluation of critical angle of seismic incidence for torsion by using dynamic analysis response spectrum method in STAAD PRO as per I.S 1893-2002. Set values from 0 to 90 degree with increment of 10 degree interval have been used for angle of excitation. Building column divided into three main categories including corner, side and middle column. The angle at which maximum torsional moment is obtain that is considered as a critical angle and results are compared in terms of axial force, bending moment and shear force for column.

Evaluation of Angle of Excitation for Torsion by Using Irregularities in R.C.C Frame