【摘要】 在对小湾拱坝的三维系统进行地震分析中，考虑坝体与库水的耦合作用，分别采用线弹性模型及非线性模型进行计算，得到了系统的自振特性及动力反应结果．结果表明：坝水耦合作用提高了坝的整体质量，降低了自振频率；伸缩横缝削弱了拱坝的整体刚度，对拱坝地震反应产生较强的非线性影响更多还原

【Abstract】 With consideration of the coupling reaction between the dam and the reservoir water,by use of the linear elastic model and the non linear model separately,the seismic responses of the 3 D system of Xiaowan arch dam is analysed,and the characteristics of free vibration and seismic response results of the system are obtained.The coupling reaction between the dam and the reservoir water improves the whole quality and reduces free vibration frequency of the dam.The presence of lateral contraction joints weakens the whole rigidness and exerts strong non linear effect on the dam.更多还原