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.
出处
《振动工程学报》
EI
CSCD
北大核心
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)
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
Koyna gravity dam material nonlinearity
foundation radiation damping
visco-spring boundary
seismic response
