长期运行老化混凝土重力坝地震反应分析  

Seismic analysis of concrete gravity dams with aging effects

作　　者：王怀亮[1,2] 周志宇[3] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]大连大学建筑工程学院,辽宁大连116622 [3]大连大学材料破坏力学数值试验研究中心,辽宁大连116622

出　　处：《地震工程与工程振动》2015年第1期183-188,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50908026);武汉大学水资源与水电工程科学国家重点实验室开放基金(2012B102)

摘　　要：早期建造的混凝土重力坝随着运行年限的增加,坝体的老化特征和损伤积累日益突出,其承载能力和抗震性能的评价问题已成为研究的重点内容。本文基于化学-湿-力耦合作用原理的连续损伤力学理论,考虑了由于力学性能退化和环境条件引起的老化因素对坝体动力损伤的影响,使用二维动力有限元-边界元混合法对丰满大坝的某溢流坝段进行了计算分析。结果表明,本文所提出的数值模型能够体现出混凝土性能的退化过程,能够预测长期运行老化混凝土重力坝的地震反应,从而为现正运行的混凝土大坝的抗震安全评价和鉴定探索了新的方法和途径。The aging characteristics and accumulation of damage of the concrete gravity dam built in the early years is obvious with increasing age. The evaluation of structural capacity and seismic performance of old dams has be- come the major concerning in engineering. A time-dependent isotropic degradation index is evaluated on the basis of hygro-chemo-mechanical effect for aged dams. The proposed two-dimensional dynamic finite element/boundary element methods can be used to analyse the seismic responses of a spillway section of the Fengman dam by taking into account the influence of mechanical degradation and harsh environmental effect. The numerical procedure pres- ented in this paper can account for the concrete degradation process and can predict the seismic behavior of the dam at a certain age, in order to explore new ways and means for the seismic safety evaluation and identification of ac- tive-dutv concrete dam.

关 键 词：混凝土坝 损伤变量 老化 地震反应 

分 类 号：TV33[水利工程—水工结构工程] TV642