Assessment of seismic responses toward multi-story buildings of steel special moment resisting frame by considering the setback irregularities

Setback irregularities are considered where discontinuity between adjacent stories is excessive. This irregularity caused the probability of high damage at structures subjected to strong earthquake motion. For this purpose, study was conducted by modeling steel special moment frame (SMF) using a finite element calculation program with nonlinear static analysis compared Padang city’s response spectrum. The buildings also modeled two types setbacks: single and multiple setbacks. results paper discussed including explanation many parameters that relate elastic inelastic seismic responses (SMF). Based on results, setback irregularities, both setbacks, adequately sufficient SNI 1726 2019 regarding drift limit. other in terms fundamental periods, inter-story drifts, story stiffness, base shear. Referred Indonesian Seismic Provision, 2019, it found building has more adequate than setbacks responses. Then, assessments these explained address recommendations about future prevention toward damages failures buildings.