基于备用荷载路径法的钢管混凝土框架抗连续倒塌机制非线性动力分析
发布时间：2019-06-15 21:16
【摘要】：根据GSA2003提出的备用荷载路径法,采用非线性动力分析方法对12层钢管混凝土空间框架当关键柱失效后,其剩余结构的抗连续倒塌机制进行分析。基于用户自定义材料开发平台(UMAT),进行了钢材和混凝土单轴本构滞回模型的二次开发,并与已有试验结果进行了对比验证。研究结果表明:关键柱失效后,失去支撑的框架梁在小变形范围内主要通过梁受弯承载力提供抗倒塌能力;在大变形范围内,失去支撑并贯通节点的框架梁,通过其受拉承载力提供抗连续倒塌能力。根据失效柱位置的不同,抗连续倒塌机制也不相同,角柱失效后,X/Y方向的框架边梁均为梁机制作为主要抗力来提供抗连续倒塌的能力,未出现悬链线效应。
[Abstract]:According to the standby load path method proposed by GSA2003, the nonlinear dynamic analysis method is used to analyze the anti-continuous collapse mechanism of the remaining structures of 12-story concrete-filled steel tubular spatial frames when the key columns fail. Based on the user-defined material development platform (UMAT), the secondary development of uniaxial constitutive hysteretic model of steel and concrete is carried out, and the results are compared with the existing test results. The results show that after the failure of the key column, the frame beam with lost support mainly provides anti-collapse ability through the bending bearing capacity of the beam in the small deformation range, and in the large deformation range, the frame beam that loses support and passes through the joint provides the ability to resist continuous collapse through its tensile bearing capacity. According to the position of the failed column, the mechanism of resistance to continuous collapse is also different. After the failure of the angular column, the frame side beam in the direction of X 鈮，
本文编号：2500526
[Abstract]:According to the standby load path method proposed by GSA2003, the nonlinear dynamic analysis method is used to analyze the anti-continuous collapse mechanism of the remaining structures of 12-story concrete-filled steel tubular spatial frames when the key columns fail. Based on the user-defined material development platform (UMAT), the secondary development of uniaxial constitutive hysteretic model of steel and concrete is carried out, and the results are compared with the existing test results. The results show that after the failure of the key column, the frame beam with lost support mainly provides anti-collapse ability through the bending bearing capacity of the beam in the small deformation range, and in the large deformation range, the frame beam that loses support and passes through the joint provides the ability to resist continuous collapse through its tensile bearing capacity. According to the position of the failed column, the mechanism of resistance to continuous collapse is also different. After the failure of the angular column, the frame side beam in the direction of X 鈮，
本文编号：2500526
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