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为模拟高温下钢筋与混凝土、压型钢板与混凝土之间的粘结-滑移性能,本文分别建立了四节点粘结-滑移空间单元刚度方程和八节点粘结-滑移单元刚度方程,给出了高温下混凝土的破坏模型和非线性本构关系及结构钢在高温下的应力-应变关系和屈服模型;然后建立了用于模拟钢.混凝土组合楼盖在火灾下的结构性能的有限元格式,并编制了相应的分析程序。通过与常温下和高温下试验结果进行对比,初步验证了本文分析理论和程序的正确性和可靠性。
In order to simulate the bond-slip behavior between steel bars and concrete, profiled steel plates and concrete at high temperature, four-node joint-slip space element stiffness equations and eight-node bond-slip element stiffness equations were established in this paper. The failure model and nonlinear constitutive relation of concrete under high temperature and the stress-strain relationship and yield model of structural steel under high temperature are given; then the finite structure used for simulating the structural performance of steel-concrete composite floor under fire is established. Meta format, and compiled the corresponding analysis program. By comparing with the test results at room temperature and at high temperatures, the correctness and reliability of the analytical theory and procedure of this paper are preliminarily verified.