Effect of Foundation Flexibility on the Seismic Performance of a High-Rise Structure under Far-Field and Near-Field Earthquakes

In this study, the seismic performance of a 20-storey steel structure with mat foundation located on layered soil is investigated under an array strong ground excitations, which includes 6 far-fault and near-fault earthquakes. Eight different modes for layering have been considered in numerical simulation. FLAC 2D nonlinear platform has used to model near-realistic behavior. To end, hundred lines codes sub-routines developed perform analysis. The results analyzes include absolute displacement floors, ratio relative shear force, axial bending moment columns. It was concluded that 20-story both far-field near-field earthquakes, most reliable type dense sandy critical case soft clay soil. also observed motions imposed more structural responses compared records.