Seismic analysis of high-rise steel frame building considering irregularities in plan and elevation

摘要: Irregularities of a building in plan and elevation, which results the change stiffness on different floors highly affect seismic performance resistance structure. This study motivated to investigate responses high-rise steel-frame buildings twelve stories with various irregularities. The has five spans 3200 mm distance both X- Z-directions plan. design package SAP2000 was adopted for beams columns resulted profile IPE500 all box sections columns. column cross-section dimensions vary concerning number story; one three: 0.50 X0.50X0.05m, four seven: 0.45X0.45X0.05 m, eight twelve: 0.40X0.40X0.05 m. Real recorded ground accelerations obtained from Vrancea earthquake Romania together dead live loads corresponding each story were considered applied load. model validated by comparing current method literature considering three-bay steel moment-resisting frame eight-story height subject To buildings, time-history analysis performed using ABAQUS. Deformed shapes negative positive peaks provided followed drifts fragility curves used examine probability collapse building. From results, it concluded that regular much better than irregular buildings. Furthermore, observed torsional irregularity more vulnerable failure.