摘要
为了解地震动持时对重力坝动力损伤特性的影响规律,以Koyna坝为例,建立坝体-坝基整体塑性损伤模型,从损伤区域分布、坝顶关键点位移以及损伤耗能情况3个方面出发,对比研究长、短持时地震动对重力坝坝体及坝基损伤特性的影响。结果表明,长持时地震动作用下坝体及坝基的损伤程度更为严重,坝顶关键点位移及损伤耗能更为明显;与坝基损伤情况相比,长持时地震动对坝体的损伤特性影响更为显著;考虑坝基塑性损伤时,坝踵处混凝土应力得到释放,不会产生损伤破坏,与实际震害情况更为符合。
In order to understand the influence of earthquake dynamic duration on the dynamic damage characteristics of gravity dams,this paper takes Koyna dam as an example to establish a dam foundation integral plastic damage finite element model.From the three aspects of damage area distribution,dam crest key point displacement and damage energy consumption,the effects of long-term and short-term ground motions on the damage characteristics of gravity dams are compared and studied.The results show that the damage degree of dam body and foundation is more serious,and the displacement and damage energy consumption of key points on dam crest are more obvious under long-term ground motion;compared with the dam foundation damage,the long-term ground motion has a more significant impact on the dam damage characteristics;when considering the dam foundation plastic damage,the concrete stress at the dam heel is released without damage,which is more consistent with the actual earthquake damage.
作者
陈锦
王琛
谢应兵
CHEN Jin;WANG Chen;XIE Ying-bing(Hunan First Engineering Co.Ltd.,Changsha 410001,China;Qingzhou Water Construction Engineering Construction Co.Ltd.,Qingzhou 262500,Shandong,China;School of Water Conservancy and Ecological Engineering,Nanchang Institute of Engineering,Nanchang 330099,China)
出处
《水利科技与经济》
2023年第3期40-43,52,共5页
Water Conservancy Science and Technology and Economy
关键词
重力坝
地震动持时
塑性损伤
损伤耗散能
位移
gravity dam
earthquake duration
plastic damage
damage dissipated energy
displacement
