Seismic evaluation of special steel moment frames subjected to near-field earthquakes with forward directivity by considering soil-structure interaction effects

Abstract

Assuming that the bottom soil of the foundation is rigid and exibility effect is ignored, the seismic response of a structure is inuenced by its dynamic properties and soil exibility does not affect the mentioned response. Hence, considering the analytical results only based on the fixed base buildings can result in an unsafe structure design. Therefore, near-field earthquakes produce many seismic needs to force the structure to dissipate this input energy with relatively large displacements. Accordingly, the primary objective of the present paper is to determine the seismic response of the 3-, 5-, and 8-story steel buildings with the special moment frame system, considering the soil-structure interaction and panel zone modeling. To this end, selected records of the near- and far-field earthquakes were used to facilitate the nonlinear time history analysis of the structures, whose responses to earthquakes were compared in both of the mentioned states. The results showed that the average drift of all three structures under the effect of near-field earthquakes was two times larger than the drift of the structures under the effect of the far-field earthquakes.