水力发电学报2013，Vol.32Issue(2)：201-207,227,8.
强震持时对混凝土重力坝损伤累积破坏的影响
Influence of strong motion duration on accumulated damage of concrete gravity dam
摘要
Abstract
Ground motion duration is one of the three key elements--amplitude, spectral characteristics and duration of ground motion that significantly affect the accumulated damage of dam structures. In this paper, a damage mechanics model is put forth for simulation of the damage dissipation of concrete fracturing and the effects of strain softness after post-peak, and overall and local indices of accumulated damage for cracking damage development are established to compare the influence of different durations on the accumulated damage. The analysis reveals that strong motion duration has a significant impact on the accumulated damage and that longer duration leads to greater damage, which should draw great attention in aseismic design. Application of the local index that is an effective criterion for the weak parts of a dam, shows that the weakness of dam structure under seismic loading is concentrated on its upper part. Thus, the proposed model provides an effective tool for quantitative evaluation of the damage level of gravity dams under strong earthquakes and also for evaluation of seismic performances of gravity dams.关键词
水工结构/损伤评价/动力有限元法/混凝土重力坝/累积破坏/强震持时Key words
hydraulic structures/ dynamic finite element method/ damage evaluation/ concrete gravity dam/ accumulated damage/ strong motion duration分类
建筑与水利引用本文复制引用
张社荣,王高辉,庞博慧,杜成波..强震持时对混凝土重力坝损伤累积破坏的影响[J].水力发电学报,2013,32(2):201-207,227,8.基金项目
国家创新研究群体科学基金(51021004) （51021004）
