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钢管混凝土组合框架在局部火灾作用下可能会出现由于受火柱破坏而引发的结构连续性倒塌破坏。在合理选取钢材与混凝土的热-力本构模型的基础上,合理选取了组合框架中梁柱构件单元模型及其相互作用模型,基于ABAQUS软件用多尺度建模方法建立了局部火灾作用下三层三跨钢管混凝土平面组合框架的数值模型,对4种典型火灾工况下结构整体变形、内力分布、破坏机制等进行了分析研究,并在此基础上进行了不同火灾工况下组合框架的耐火极限计算。结果表明:框架中间层受火时,由于周围构件的约束作用明显而使得其耐火极限最大。
In the case of local fires, the CFST frame may collapse due to the continuous collapse of the structure caused by the destruction of the fire column. Based on the reasonable selection of thermo-mechanical constitutive model of steel and concrete, a reasonable selection of the beam-column element model and its interaction model in the composite frame was established. Based on the ABAQUS software, a multi-scale modeling method was used to establish a three- Based on the numerical model of three-span CFST plane composite frame, the overall structural deformation, internal force distribution and failure mechanism under four typical fire conditions were analyzed and studied. Based on the above analysis, Fire resistance calculation. The results show that the flame resistance of the middle layer of the frame is maximized due to the restraining effect of the surrounding members.