型钢再生混凝土柱-钢梁组合框架节点受力性能非线性分析

在型钢再生混凝土柱-钢梁组合框架节点拟静力试验基础上,采用ABAQUS有限元软件建立了组合框架节点的数值计算模型,对该组合框架节点在水平荷载作用下的受力非线性行为进行了有限元分析,获取了组合框架节点的破坏过程、破坏形态、应力云图、荷载-位移曲线及荷载特征值,并对节点的承载力计算值与试验值进行了比较,验证了有限元计算模型的合理性,进而分析了有限元拓展参数对组合框架节点受力性能的影响规律。结果表明:有限元计算结果与试验结果吻合较好,该有限元模型能较好地模拟该组合框架节点在水平荷载作用下的受力性能;另外,提高再生混凝土强度或者箍筋强度对组合框架节点的抗剪承载力是有利的,但节点的延性变形能力有所降低;组合框架节点的抗剪承载力随着型钢强度的提高而显著增加,但节点的变形能力变化不大;增加体积配箍率或型钢配钢率可以明显提高组合框架节点的抗剪承载力和变形能力。

Nonlinear finite element analysis on steel reinforced recycled concrete columns-steel beams frame composite joints

Based on the quasi-static test of steel reinforced recycled concrete column-steel beam frame composite joints, a numerical calculation model of composite frame joints was established by using ABAQUS finite element software, and finite element analysis was carried out on the nonlinear behavior of the joint under horizontal load. Besides, the failure process, failure pattern, stress nephogram, load-displacement curve and load characteristic values of joint specimens were obtained. The calculated value of the bearing capacity of the joint was compared with the experimental value, and the rationality of the finite element model was verified. Finally, the influence rule of finite element expansion parameters on the mechanical behavior of the composite frame joints was analyzed. The analysis results show that the finite element results agree well with the experimental results, and the finite element model can well simulate mechanical performance of the composite frame joints under horizontal load. In addition, increasing the strength of recycled concrete or stirrup is beneficial to the shear capacity of composite frame joints, but the ductility deformation capacity of joints is reduced. The shear capacity of composite frame joints increases significantly with the increase of section steel strength, but the deformation capacity of composite frame joints has a little change. Increasing volume-stirrup ratio or steel ratio can obviously improve the shear capacity and deformation capacity of composite frame joints.