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给出用于轴心受压圆钢管混凝土柱火灾响应仿真分析的纤维梁模型。该模型由两部分组成,一种是圆钢管,另一种是核心混凝土。构件受端部非线性纵向和横向连接相互影响。单元采用不考虑刚体模态的系统进行计算,并通过由连接单元建立的结点的纵向和横向共同旋转方程对几何大变形进行计算。该模型适用于不同混凝土填充的钢管混凝土柱:普通或高强的素混凝土、加固混凝土、钢筋混凝土,利用柱试件的火灾试验数据对模型进行了验证。其结果也与能够准确模拟火灾响应的三维有限元模型进行了比较。
The fiber beam model for simulating the fire response of concrete-filled steel tubular columns under axial compression is given. The model consists of two parts, one is a round pipe and the other is core concrete. The members are affected by the non-linear longitudinal and transverse connections of the ends. The unit is calculated using a system that does not consider rigid-body modalities, and the large geometric deformation is calculated by the common longitudinal and transverse rotation equations of the nodes established by the connecting elements. The model is applied to CFST columns filled with different concrete: normal or high-strength plain concrete, reinforced concrete and reinforced concrete. The model is validated by fire test data of column specimens. The results are also compared with a three-dimensional finite element model that can accurately simulate the fire response.