基于不同本构模型的混凝土结构地震倒塌对比分析

Comparison study on seismic collapse of concrete structures with different constitutive models

基于混凝土材料本构模型,结合精细化结构单元模型和高效稳定的数值算法,实现了混凝土结构的动力倒塌全过程分析。对建模方法、结构分析方法、材料与构件失效准则等进行了简要介绍。以某钢筋混凝土框架-剪力墙结构为例,分别采用混凝土弹-脆性本构模型、弹塑性本构模型和随机损伤本构模型进行了结构地震倒塌全过程分析。结果表明:混凝土本构模型对结构倒塌分析具有重要的基础地位,本构模型选取不当,将给出错误的倒塌模式或分析结果;混凝土随机损伤本构模型能够准确地预测结构的强非线性行为,可用于复杂混凝土结构倒塌全过程的模拟。

Combining the refined structural element models with the efficient and robust numerical integration algorithm, a constitutive model-based dynamic whole-process analysis for RC structures was implemented. A brief introduction to the element modeling approach, the structural analysis method as well as the material and component failure criteria was provided. Taking a certain prototype reinforced concrete frame-shear wall structure as an example, different seismic collapse simulations with elasto-brittle, elasto-plastic and stochastic damage constitutive models of concrete were compared and investigated. Research results indicate that the concrete constitutive relationship plays a fundamental role in the collapse analysis of structures and improper selection of constitutive models of concrete will lead to wrong collapse modes and analysis results. Moreover, the stochastic damage constitutive model of concrete is capable of predicting the structural strong nonlinear behaviors and is available for the simulation of overall collapse process of complex concrete structures.