【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。更多还原

【Abstract】 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.更多还原