Effect of bending and shear performance of steel coupling beams under near-field and far-field earthquakes

Abstract

This study examines the bending and shear performance of steel coupling beams under near-field and far-field earthquakes using ETABS Software. For this purpose, four sample 10-story buildings with coupled walls and coupling beams with different heights are modeled in 2D form, and the results of the analysis of the buildings are compared and investigated. These analyses compare shear forces, bending anchors, and lateral displacements resulting from lateral loads in the coupled shear walls in each sample building. Then the seismic behavior of coupling beams is examined. The analyzed 2D structures are 10-story, the length of the shear wall equals 600cm, and the length of the coupling beams is 180cm. The same height of 350cm was considered for each floor. The height of coupling beams was different in each structure, so it equaled 220cm, 180cm, 140cm, and 100cm in the first, second, third, and fourth structures, respectively. The results revealed the greater effect of near-field earthquakes on the displacement history response based on the average response graph of structure displacement history under the far- and near-field earthquake records. In the case of a near-field earthquake, the average history of base shear would be about 0.182ton, so this rate would be about 0.086ton in the far-field earthquake. In the near-field earthquake, the average displacement history is around 0.124 of the earth’s gravity acceleration.