考虑多种因素影响的重力坝地震响应分析  

Analyses of seismic response for gravity dam considering variable influence factors

作　　者：何建涛[1,2] 陈厚群[2] 马怀发[2,3] 

机构地区：[1]国核电力规划设计研究院,北京100095 [2]中国水利水电科学研究院工程抗震研究中心,北京100048 [3]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《振动工程学报》2012年第5期571-578,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51079164);水利部公益专项基金资助项目(201201053);中国水利水电科学研究院科研专项基金资助项目(KJ1133;KJ1242)

摘　　要：综合考虑坝体混凝土和坝基岩体的材料非线性、无限地基辐射阻尼等因素,对Koyna重力坝进行了地震响应分析,解释了实际震害。用传统方法对Koyna坝进行了地震响应分析,可以看出,坝体混凝土采用线弹性模型不能如实反映可能出现的裂缝分布,其结果只能对起裂位置进行一定的预测;考虑材料初始抗拉强度和抗剪强度的预设缝方法预测的开裂范围较大,考虑到实际工程都需要一定的安全储备,因此预设缝方法是合理可行的。Considering the material nonlinearity of dam concrete and foundation rock and radiation damping of infinite toundalion, a realistic seismic response analysis for Koyna gravity dam is carried out, which gives a reasonable explanation for actual earthquake damage. The same response was analyzed by using conventional methods. It can be seen that the linear elastic model for dam concrete can＇t truthfully reflect the possible crack distributions. It can only predict the crack location to some extent. Compared with the simulated results by using the conventional methods, the cracking scope is a little larger based on the pre-set crack method, in which initial tensile and shear strength of the material are taken into account. Therefore, the pre-set crack method is reasonable and feasible because the actual project requires some security reserves.

关 键 词：Koyna重力坝 材料非线性 地基辐射阻尼 黏弹性边界 地震响应 

分 类 号：TV642[水利工程—水利水电工程] TV312