钢筋混凝土简支梁结构破坏过程的损伤模型与数值模拟

将损伤力学理论与有限元法相结合,研究钢筋混凝土简支梁静载作用下的损伤破坏过程.基于弹性损伤一般理论,考虑了混凝土材料在受拉与受压状态下损伤行为的不同,建立了含三个独立参数的损伤力学模型.运用损伤力学-附加荷载-有限元法,对钢筋混凝土简支梁结构的损伤破坏过程进行了数值分析,其破坏模式和位移的理论结果与试验结果相吻合.研究结果表明,该损伤本构模型可较好地描述钢筋混凝土简支梁结构的损伤与破坏行为.

Damage model and numerical simulation for failure process of reinforced concrete free beam

Failure process for the reinforced concrete free beam under static loading is formulated based on the elastic damage theory with the finite element method.By taking account of the different damage behaviors of concrete under tension and compression conditions,a damage mechanics model with 3 independent parameters is derived from the elastic damage theory.By combining the proposed damage model with the FEM,the damage mechanics-additional load-finite element method is developed to analyse the failure process of the reinforced concrete free beam.The theoretical results for the failure modes and displacements are in good agreement with the experimental observations.This indicates that the proposed damage constitutive model can be applied to describe the damage and fracture behaviors of the reinforced concrete free beam.