超强地震作用下高拱坝损伤开裂行为研究  

Study on cracking behavior of high arch dam subjected to strong earthquakes

作　　者：龙渝川[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《水力发电学报》2012年第5期178-183,190,共7页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(50909109);教育部高等学校博士学科点科研基金(20090191120031);中央高校基本科研业务费资助项目(CDJRC10200005)

摘　　要：本文综合应用塑性-损伤耦合模型和接触边界方法,模拟拱坝坝体开裂与横缝开合行为,然后基于有限元仿真方法,分析某高拱坝的强震开裂行为。通过不同温度荷载工况的比较分析,研究温度荷载对拱坝非线性动力响应的影响。计算结果显示:在强震作用下,拱坝下游坝面损伤开裂出现在坝体中上部,而上游坝面损伤集中于坝基交界面附近,同时裂缝张开位移幅值较大,扩展深度较深,严重威胁拱坝整体安全。计算结果还表明:施加不同的温度荷载,拱坝的静力变形不同,导致强震作用下拱坝的横缝张开位移、坝体开裂区域、裂缝张开位移等动力响应存在显著差异。A numerical study is presented for cracking behaviors of high arch dam under strong earthquakes, using a plastic-damage model and a contact boundary method to model concrete cracking and opening/closing behaviors of contraction joint, respectively, and focusing on the influence of thermal loading on dynamic responses of the dam. Computations of the responses show that on the downstream face, concrete cracking occurs in the upper middle region of dam body, while on the upstream face, it concentrates near the dam- foundation interface. These cracks are large in magnitude and extend to the deep interior of the body, hence causing a potential threatening to instability of dam structure. The results indicate a significant influence of thermal loading on the dynamic responses of joint opening, cracks and crack opening displacement, etc.

关 键 词：水工结构 开裂损伤 数值仿真 高拱坝 超强地震 

分 类 号：TV313[水利工程—水工结构工程]