某重力坝考虑混凝土拉压损伤的地震响应分析

Seismic response analysis of gravity dam considering concrete tensile and compressive damage

本文结合某实际重力坝工程,采用有限元软件ABAQUS的混凝土材料塑性损伤本构模型模拟了其混凝土材料在地震荷载作用下拉压损伤、拉压转换的全过程,并通过地震超载的方式使混凝土重力坝逐步达到极限状态,探讨了混凝土重力坝拉压损伤演化过程和变化趋势。通过与仅考虑混凝土受拉损伤在不同地震超载系数下的计算结果对比,还考虑混凝土受压损伤对重力坝强震破坏过程和极限抗震能力分析的影响。研究结果表明,同时考虑拉压损伤和只考虑拉损伤的极限抗震能力相同,且重力坝的强震损伤极限状态主要是由受拉损伤控制,同时在多轴应力状态下,拉压损伤有可能在同一部位同时出现。

Based on a practical gravity dam project,the plastic damage constitutive model of concrete material with finite element software ABAQUS is used to simulate the whole process of concrete material’s tensile and compressive damage and its transformation,and achieve the ultimate state of the concrete gravity dam by means of seismic overload gradually,probes into the concrete gravity dam and compressive damage evolution process and the change trend. By comparing with the calculation results of considering concrete tensile damage only under different seismic overload factors,the effects of concrete compression damage on the gravity damage process and ultimate seismic capacity analysis of gravity dam are addressed. The results show that the ultimate seismic capacity is very close when considering tensile and compressive damage and considering only tensile damage,and the limit state of strong earthquake damage of gravity dam is mainly controlled by tensile damage,and it is also possible to produce compressive damage in the damaged part.