爆炸冲击作用下三种混凝土本构模型对比研究

Comparative study on three concrete constitutive models under blast loading

数值模拟是结构抗爆领域研究的重要方法,数值模拟效果在很大程度上取决于动态本构模型的选择。本文对混凝土主要的3种动态本构模型:HJC、RHT和K&C进行分析,针对不同模型的关键参数、优缺点进行了评述。采用3种不同动态本构模型模拟了文献中的钢筋混凝土板爆炸试验,对比分析了不同本构模型的模拟结果,为进一步完善抗爆数值模拟提供参考。分析结果表明:在爆炸冲击工况下,RHT和K&C在本构理论的表达上相对全面,HJC对破坏形态和最大挠度的描述更接近试验。

Numerical simulation is widely used in structural anti-blast research.The selection of dynamic constitutive model plays a decisive role in numerical simulations.The present study reviews the key parameters,advantages and disadvantages of three main types of dynamic constitutive models including HJC,RHT and K&C.The three models were adopted to simulate an explosion test of reinforced concrete slabs from literature.The simulation results of three models were then analyzed and compared to provide references for anti-blast simulations.Results show that both RHT and K&C models more comprehensively express the constitutive theory while the HJC model achieves higher accuracy in simulating failure forms and maximum deflections.