Basrah Journal for Engineering Science

Abstract

The goal of the present paper is to study the adequacy
of torsional provisions in the international buildings code (IBC)
for irregular building taken into account effect of the angles of
seismic attacks. The responses of the frame-shear-wall twelvestory asymmetric building under earthquake loading by using
equivalent lateral force procedure and dynamic response
spectrum analysis have been studied intensively in this present
research paper. This study performs static and dynamic
response analyses of building models under earthquake ground
motions compatible with the design response spectrum defined
in the international buildings code. The dynamic response
spectrum was scaled according to the code static base shear. The
static and dynamic base shear with different angles of seismic
attacks has been calculated. The scaling factors, angles of
seismic attacks, accidental storey torsions, storey shear,
dynamic and static base shear have been evaluated here. The
torsional moment at different storey levels for dynamic analysis
has been estimated and compared with the static values.