Abstract— Earthquakes are a natural calamity, feared by most and cause great destruction in and around the seismic zone where they occur. In seismic design of buildings, the earthquake motions are considered in principle directions of building which may not be true in all cases. The present study is focused on the earthquake incidence angle and its effect on the structure’s column axial force and to obtain the critical angle using Non Linear Time History Analysis. A set of values from 0 to 90 degrees, with an increment of 10 degrees, have been used for angle of excitation. An asymmetrical structure of 10 storeys was considered. It can see that the critical angle may vary the column axial force from column to column. The models are analysed using ETABS 15 software. The structural parameters such as column axial force, displacement and story shear in columns are studied. The paper concludes that the internal forces of structural elements depend on the angle of incidence of seismic wave data. There are different critical angles for different parameters, not necessarily that it should be the same of the column axial force.
Keywords— Incidence angle, Non Linear Time History, Column axial force, Displacement, Story shear.
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