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介绍一种立体的有限元模型,可用来评估受重力和火灾荷载的组合梁-板组件的响应。使用有限元分析软件模拟典型梁-板组件在不同剪切条件(栓焊混合连接和全部螺栓连接的双角钢节点)和不同火灾场景下的性能。有限元模型中包含随温度变化的组成材料的热力学性能、连接件和混合作用。使用瞬态时域热应力耦合分析来获得组合梁-板组件的温度分布和变形响应。通过对所预测的和所测量的火灾情况下3个组合梁-板组件热学参数和结构响应参数进行对比,验证了这个有限元模型。通过对比显示,所提出的有限元模型可以很准确地预测梁-板组件的火灾响应。分析研究可知,梁和板的混合作用很大程度上提升了组合梁-板组件的耐火性能。因此,可以推论出所提出的有限元模型可用来评估组合楼板结构火灾响应。
Describes a three-dimensional finite element model that can be used to evaluate the response of composite beam-plate assemblies subjected to gravity and fire loads. The finite element analysis software was used to simulate the behavior of a typical beam-plate assembly under different shear conditions (double angle joint with bolted and fully bolted joints) and different fire scenarios. The finite element model contains the thermodynamic properties of the constituent materials as a function of temperature, connectors, and mixing effects. Transient temporal thermal stress coupled analysis was used to obtain the temperature distribution and deformation response of the composite beam-plate assembly. This finite element model was verified by comparing the predicted and measured thermal and structural response parameters of the three composite beam-plate assemblies. The comparison shows that the proposed finite element model can accurately predict the fire response of the beam-plate assembly. Analysis shows that the mixing effect of beams and slabs greatly enhances the fire resistance of the composite beam-slab assembly. Therefore, it can be deduced that the proposed finite element model can be used to evaluate the fire response of composite floor structures.