考虑界面效应的钢-混凝土组合结构有限元模拟方法

Finite Element Simulation Method of Steel-Concrete Composite Structure Considering the Interface Effect

鉴于钢-混凝土接触界面剪切力传递问题的复杂性,当前对钢-混凝土组合结构有限元模拟方法多样,但大部分或过于复杂技术难度大,或过于经验化需要依赖大量的试验结果确定参数。考虑实用性和精确性相结合的理念,提出一种采用特定超弹性界面虚拟单元的钢箱混凝土组合结构有限元模拟方法,同时该方法建议混凝土采用混凝土塑性损伤模型。将该方法应用于某组合结构剪力键推出试验模拟中,对其力学性能及界面剪切力的发展全过程进行数值模拟。结果表明该界面模拟方法使用方便、结果可靠,适用于钢箱混凝土组合结构考虑界面黏结滑移效应的有限元模拟中。

Due to the complexity of a shear transfer problem of the contract interface between steel and concrete, there are various finite element simulation methods on the steel-concrete composite structure currently. However, most of the methods are either too complicated for technical problems or too experiential which depends on many test results to determine the parameters. Therefore, considering the idea of combination of practicality and accuracy, a method using specific hyper elastic virtual interface element was proposed to simulate the steel-concrete composite structure. And it also suggested the concrete plastic damage model can be adopted. The proposed method was applied to the numerical simulation of the mechanical property and interracial shear force in the whole development process of composite structure shear connector＇ s push-out tests. The results show that the proposed method is feasible and reliable, which is applicable to the FE simulation of the steel-concrete composite structure considering the interfacial bond slip effect.