再生混凝土波形腹板PEC柱(弱轴)-钢梁中节点抗震性能研究OA

Based on previous research on corrugated web PEC columns,this study designed a recycled aggregate concrete corrugated web PEC column(weak axis)-steel beam interior joint specimen subjected to low-cycle reversed loading.A total of 15 finite element models were established to analyze the influence of several variables,including the concrete strength in the joint panel zone,the thickness of the vertical stiffener plate,the flange thickness,the web configuration,and the axial compression ratio.The results indicate that,compared with flat web joint specimens,the corrugated web joint specimens reached their peak load capacity at a later stage and exhibited a more rapid strength degradation after the peak.Significant shear failure was observed in the recycled concrete within the joint core area,significant buckling was observed in the column flanges on both sides of the panel zone,and the weld at the steel beam-to-end-plate connection fractured.Variations in the flange thickness and vertical stiffener plate thickness in the joint region had a considerable influence on both the joint bearing capacity and cumulative energy dissipation.In contrast,changes in the concrete strength and axial compression ratio in the joint zone had relatively minor effects.The shear capacity of the joint was primarily controlled by the restraining action provided by the flanges and the vertical stiffener plate.Based on mechanical analysis of the joint,a formula for predicting the shear capacity of recycled concrete corrugated web PEC column(weak axis)-steel beam joints was proposed.The calculated results showed good agreement with both experimental data and finite element simulations.