栓钉式钢-混凝土组合梁剩余承载力有限元分析

Finite Element Analysis for Residual Bearing Capacity of Studded Steel-concrete Composite Beam

为计算钢-混凝土组合梁剩余承载力,采用适用于组合梁的非线性有限元建模方法,提出疲劳简化分析法并用于组合梁剩余承载力计算中,通过与试验结果对比证明了该方法的有效性,在此基础上探究抗剪连接度与荷载幅值对组合梁剩余承载力的影响规律。结果表明:组合梁疲劳简化分析法用于计算组合梁剩余承载力可以简化计算过程,且计算结果与试验结果吻合较好,平均误差为15%;组合梁剩余承载力退化呈单调递减趋势,荷载幅值增大及抗剪连接度降低会提高组合梁剩余承载力退化速率,增大剩余承载力退化量,使处于加载末期的组合梁剩余承载力呈指数型退化。

In order to calculate the residual capacity of the steel-concrete composite beam,the nonlinear finite element modeling method suitable for composite beams is introduced,and the simplified fatigue analysis method is proposed and used in the calculation of the residual bearing capacity of composite beams.The comparison of test results proves the effectiveness of the method,and on this basis,the influence of shear connection and load amplitude on the residual bearing capacity of composite beams is explored.The results show that the simplified fatigue analysis method of composite beams to calculate the residual capacity of composite beams can simplify the calculation process,and the calculation results are in good agreement with the test results with an average error of 15%;the residual capacity of composite beams tends to decrease monotonically;with the increase of load amplitude and the decrease of shear connection,the degradation rate of residual capacity of the composite beam increases and the residual capacity of the composite beam at the end of loading is degraded exponentially.