型钢混凝土叠合梁恢复力模型研究

Model Research on Restoring Force of Prefabricated Steel Reinforced Concrete Beams

基于型钢混凝土叠合梁的抗震试验研究,对混凝土强度、浇筑类型及截面类型三个试验参数下6个试件的荷载-挠度滞回曲线展开分析。根据试验结果,运用数据拟合方法,建立型钢混凝土叠合梁的三折线骨架曲线模型,并给出了各段折线的方程表达式。对低周反复加载的各试件刚度退化规律进行线性回归,得到统一的加载和卸载刚度计算表达式,建立型钢混凝土叠合梁的恢复力模型。结果表明,通过所建议的恢复力模型计算得到的骨架曲线与试验得到的骨架曲线吻合度较好,说明该恢复力模型具有较好的适用性。

Based on the aseismic test of prefabricated steel reinforced concrete beam, the load-deflection hysteresis curve of six specimens under three test parameters of concrete strength, casting type and section form are analyzed.According to the experimental results, the model of three-fold line skeleton curve of prefabricated steel reinforced concrete beam is established by means of data fitting method, and the equation expressions of the fold lines are given. Linear regression is performed for the stiffness degradation rules of the specimens with low cyclic loading, and the expressions of uniform loading and unloading stiffness are obtained, then the restoring force model of the prefabricated steel reinforced concrete beam is established. The results show that the skeleton curve obtained by the proposed recovery model is close to the test results, which indicates that the restoring force model is applicable.