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为分析火灾全过程作用下钢-混凝土组合楼盖的力学性能,利用有限元分析软件ABAQUS,合理选取钢材和混凝土材料本构模型,并考虑不同构件之间相互接触等基础上,建立了考虑火灾和荷载共同作用下的钢-混凝土组合楼盖热-力耦合有限元模型,并与现有相关试验数据进行了模型验证。在此基础上,对经历常温、火灾升温、降温作用以及火灾后等不同阶段的组合楼盖受力性能和工作机理进行了研究,并对影响火灾全过程作用后钢-混凝土组合楼盖力学性能的影响因素进行了分析。分析结果表明:火灾高温作用使得组合楼盖的承载力相对于常温下有所降低,由于组合楼板的吸热作用,整个楼盖温度较低,受火后仍然具有较高的承载力;火灾升温时间比、钢梁的屈服强度、混凝土抗压强度和板厚度对火灾全过程作用后钢-混凝土组合楼盖的力学性能影响较显著。
In order to analyze the mechanical properties of the steel-concrete composite floor under the whole fire process, the finite element analysis software ABAQUS was used to select the constitutive models of the steel and concrete materials reasonably and to consider the mutual contact between the different components. And finite element model of thermo-mechanical coupling of steel-concrete composite floor under the combined action of load and load. The model is verified with the existing experimental data. On this basis, the mechanical properties and working mechanism of the composite floor at different stages such as room temperature, fire warming, cooling and post-fire are studied. The mechanical properties of the steel-concrete composite floor after the fire is affected The influencing factors were analyzed. The results show that: the fire caused by the high temperature effect of composite floor relative to the carrying capacity at room temperature decreased, due to the combined floor of the endothermic effect, the entire floor temperature is low, after the fire still has a high bearing capacity; fire heating The time ratio, the yield strength of steel beam, the compressive strength of concrete and the thickness of plate have a significant effect on the mechanical properties of steel-concrete composite floor after the whole process of fire.