基于三维黏弹性边界的混凝土重力坝抗震性能分析  

3-D viscoelastic boundary-based analysis on seismic performance of concrete gravity dam

作　　者：李金友 成卫忠[1] 李同春 LI Jinyou;CHENG Weizhong;LI Tongchun(Shanghai Investigation,Design and Research Institute Co.,Ltd.,Shanghai 200434,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu,China;National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Hohai University,Nanjing 210098,Jiangsu,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434 [2]河海大学水利水电学院,江苏南京210098 [3]河海大学水资源高效利用与工程安全国家工程研究中心,江苏南京210098

出　　处：《水利水电技术》2018年第10期59-66,共8页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51579083;51579085);水利部公益性行业科研专项经费项目"高混凝土坝抗震安全研究"(20155015412);水文水资源与水利工程科学国家重点实验室开放基金(2017491811)

摘　　要：为进一步推动三维黏弹性人工边界在坝工抗震领域的研究和应用,更为方便地实现边界设置和波动输入方法与大型商业软件相结合,基于黏弹性边界基本理论及ANSYS有限元软件中的弹簧—阻尼单元,编制了三维黏弹性人工边界程序,该程序可有效求出边界结点的等效荷载,从而可以实现黏弹性边界单元的波动输入。然后,通过数值算例验证得出地表位移最大值接近入射波幅值的2倍,说明该程序的计算结果具有较高的精度。最后,将黏弹性边界单元及地震波入射方法应用到巴基斯坦玛尔水电站典型溢流坝段的抗震分析中,计算结果显示,在设计地震作用下坝体的动力响应峰值较固定边界下可减小20%~40%,说明考虑无限地基阻尼影响是很有必要的。Based on the basic theory of viscoelastic boundary and spring-damper element in ANSYS,a program of 3-D artificial viscoelastic boundary is made;from which the equivalent load at the boundary node can be effectively calculated and then the fluctuated input of the viscoelastic boundary element can be realized as well.Whereafter,it is demonstrated through the relevant numerical calculation case that the maximum ground surface displacement is close to two times of the amplitude of the incident wave,which indicates that the calculation result from the program has high accuracy.Finally,the viscoelastic boundary element and the incidence of seismic wave method are applied to the seismic analysis made on a typical overflow dam section of Mahl Hydropower Station in Pakistan,of which the result shows that the peak dynamic response of the dam body under the design earthquake action can be decreased by 20%~40%when compared with that under the condition of the fixed boundary,thus it is indicated that the consideration of the influence from infinite foundation damping is quite necessary.

关 键 词：混凝土重力坝 黏弹性边界 地震波 动力响应 固定边界 

分 类 号：TV642[水利工程—水利水电工程]