双向地震波输入时振动方向对拱坝地震响应的影响  

Effect of earthquake wave vibration direction on seismic responses of arch dam under bidirectional earthquake wave input

作　　者：宋贞霞[1,2] 丁海平[1,2] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080 [2]苏州科技学院江苏省结构工程重点实验室,江苏苏州215011

出　　处：《地震工程与工程振动》2013年第3期64-70,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51278323)

摘　　要：拱坝-地基三维地震响应分析中大多只分析入射地震波在拱坝-地基系统坐标系方向输入时的地震响应,而事实上,垂直入射的剪切波其振动方向是不确定的,地震波动的合理输入对拱坝-地基系统的地震响应分析起着决定性的作用。本文研究了拱坝-地基系统在双向地震波输入时不同振动方向对拱坝-地基系统地震响应的影响。计算结果表明:在双向地震波输入情形时,拱坝位移及应力响应最大值均不是发生在传统方法的横河向或者顺河向,而是与输入地震波相关,所以在研究拱坝-地基三维地震响应时有必要考虑入射地震波振动方向的影响。The effects of incident earthquake wave vibration direction on three-dimensional arch dam seismic analysis are mostly confined to the cases： along the river,across the river or three-directional earthquake input.However,in fact,the main vibration direction of vertical incident shear waves is uncertain.Reasonable input of earthquake wave plays a decisive role in the seismic responses of arch dam and foundation system.The effects of different earthquake wave vibration directions on seismic response of arch dam-foundation system are studied in this paper.The results show that： in the case of bidirectional earthquake wave input,the maximum displacement and strain responses of arch dam don’t occur when the vibration direction is across or along the river.The maximum responses are relative to the input seismic wave.So it is necessary to consider the vibration direction of the incident earthquake wave in the study of 3D seismic responses of arch dam.

关 键 词：双向地震波 振动方向 拱坝 地震响应 

分 类 号：P315.3[天文地球—地震学] P315.93[天文地球—固体地球物理学]