水平荷载下型钢再生混凝土柱-钢梁组合框架受力性能非线性数值分析

在型钢再生混凝土柱-钢梁组合框架拟静力试验的基础上,采用Abaqus软件建立该组合框架有限元模型并进行非线性数值分析,获取组合框架的变形图、应力云图及荷载-位移骨架曲线,分析组合框架的受力破坏特征,验证了有限元模型的合理性,并对组合框架进行了参数分析。结果表明,数值模拟计算值和试验值对比误差较小,数值计算模型能够较好地模拟该组合框架的受力性能;组合框架符合强柱弱梁的破坏机制;另外,提高型钢强度或再生混凝土强度对组合框架承载力和刚度有利,但对其变形能力不利;框架承载力和刚度随着梁柱线刚度的增加而提高;增大轴压比对于组合框架的抗震性能和延性不利。研究结论可为该类绿色组合框架的工程应用提供参考。

Nonlinear numerical analysis on mechanical performance of steel reinforced recycled concrete columns-steel beams composite frame under horizontal loads

Based on the quasi-static test of a steel reinforced recycled concrete columns-steel beams composite frame,its finite element model was established in Abaqus software and a non-linear numerical analysis was carried out.The deformation diagrams,stress nephogram and load-displacement skeleton curves of the composite frame were obtained by finite element calculation.The failure characteristics of the composite frame were analyzed and the rationality of the finite element model was also verified,and the parameters of the composite frame are analyzed.The results show that the calculation results are in good agreement with the test results,and the numerical simulation model can simulate the mechanical behavior of the composite frame well.The composite frame conforms to the failure mechanism of strong column and weak beam.In addition,increasing the strength of steel products or recycled concrete is beneficial to the bearing capacity and stiffness of the composite frame,but the improvement of the material strength is disadvantageous to the deformation capacity of the frame.The bearing capacity and stiffness of the frame increase with the increase of beam-column linear stiffness.Increasing the axial compression ratio is unfavorable to the seismic performance and ductility of composite frames.The research conclusion can be provide a reference for the engineering application of this kind of green composite frames.