中文摘要：

为研究重力坝在地震动力荷载作用下的一般反应规律,以万家寨水利工程挡水坝段为分析对象,基于附加质量法对其进行动力时程分析,分析坝体关键点在地震过程中的应力、位移、损伤等地震响应的变化规律。结果表明：坝体不同部位的应力变化趋势基本相同,其中最大应力值出现在下游折坡点处,峰值应力9.78 MPa;随着坝体高度的增加位移增大,位于同一高度时,下游位移高于上游位移;损伤主要集中在下游折坡点处,随着地震的持续增大,从F点逐渐向坝体内部扩展。

英文摘要：

To study the general laws on reaction of gravity dam under the seismic dynamic loading, the retaining dam section of Wan Jiazhai water conservancy projects is taken as the analysis object. A two-dimensional finite element model is built for dynamic time history analysis based on the added mass standard. Variation rules of seismic responses on the key points of dam are analyzed, such as stress, displacement, damage , and so on. The result shows that the stress changing trend of different parts of the dam body is basically the same and the peak stress value with 9.78 MPa is appeared on the downstream slope point. Displacement increases with the dam height increasing and the displacement of the upstream is higher than that of the downstream at the same height. Damage is mainly concentrated on the downstream slope point and will gradually expand to the internal dam body from F-point with the earthquake increasing.