【摘要】 为分析混凝土重力坝的抗震能力,基于Koyna地震波设置若干地震工况,先利用混凝土塑性损伤模型(CDP模型),基于ABAQUS计算大坝的地震响应,并提取关键区域混凝土的应变时程曲线,再使用基于可靠度的混凝土最大应变与损伤关系曲线(P-D-ε曲线)分析混凝土的损伤程度,进而判断混凝土大坝在不同状态下可承受的峰值加速度。结果表明,在地震输入加速度峰值较小时,坝体会出现局部损伤,但未破坏,当达到较大峰值加速度时,坝颈混凝土破坏,大坝安全性降低。更多还原

【Abstract】 In order to analyze the seismic capacity of concrete gravity dam,Koyna seismic waves was applied to set several seismic conditions.The concrete plastic damage model and ABAQUS were used to simulate the seismic response of the dam.The strain time-histories curve of the concrete in the key areas was extracted.The damage of the dam was analyzed by using the maximumP-D-εcurve based reliability.So,the maximum acceleration that the dam can withstand under each seismic condition can be judged.The results show that the dam could be damaged in some areas under low seismic acceleration,but the dam neck could be destroyed when the ultimate seismic acceleration comes,and the safety of the dam decreased.更多还原