摘要
为深入了解主余序列对重力坝损伤特性的影响,依托某拟建重力坝,采用混凝土塑性损伤模型,根据规范反应谱拟合了30条人造主余震作为地震动输入,以损伤耗能为评价指标定量分析了主余震对大坝上部、坝踵以及大坝整体的损伤累积破坏的影响。研究表明:余震更易加深大坝上部的损伤破坏程度,其中使大坝上部的损伤程度增加了15.8%,使大坝坝踵的损伤程度增加了6.9%,使大坝整体的损伤程度增加了9.3%;大坝在主余震作用下,有明显的二次破坏现象,在大坝的抗震设计中应重视主余震对结构产生的破坏效应。
In order to further understand the impact of mainshock-aftershock sequences on the damage characteristics of gravity dam,this paper takes a proposed gravity dam as the research object to establish a damage simulation model.30 artificial mainshock-aftershock sequences are fitted according to the normative response spectrum as ground motion input,and the damage energy consumption is took as the evaluation index to quantitatively analyze the impact of mainshocks and aftershocks on the damage accumulation of the upper part of the dam,the heel of the dam and the whole dam.The research shows that aftershocks increase the damage degree of the upper part of the dam by 15.8%,the damage degree of the dam heel by 6.9%,and the damage degree of the whole dam by 9.3%.Aftershocks are more likely to deepen the damage degree of the upper part of the dam.The dam has obvious secondary failure phenomenon under the action of the mainshock-aftershock,and the damage effect of the mainshock-aftershock on the structure should be emphasized in the seismic design of the dam.
作者
徐乐意
黄海斌
郁怀光
XU Leyi;HUANG Haibin;YU Huaiguang(Huashi Design Group Co.,Ltd.,Nanjing 210000,China;Nanjing Water Resources Planning and Design Institute Co.,Ltd.,210000 Nanjing,China)
出处
《华北地震科学》
2024年第2期9-13,共5页
North China Earthquake Sciences
基金
2021年江苏省水利科技项目(2021068)
2022年江苏省水利科技项目(2022011)。
关键词
重力坝
主余震
塑性损伤
损伤耗能
gravity dam
mainshock-aftershock
plastic damage
damage energy consumption
