斜入射条件下V形河谷地震响应规律研究

Research on Seismic Response of V-shaped River Valley under Oblique Incidence Wave

合理给定不同V形河谷条件的地震波输入机制,是进行拱坝地震安全性评价的重要前提。基于地震波斜入射理论,研究不同V形河谷的地震P波斜入射问题,探讨V形河谷不同坡角、P波不同入射角度、不同频率对河谷地震响应的影响规律。结果表明,较缓的V形河谷地震响应较小;地震波入射角为60°时V形河谷的地震响应最大;地震波频率与河谷自振频率接近时地震响应最大。

It is an important premise for seismic safety evaluation of arch dam to reasonably determine the seismic wave input mechanism of different V-shaped river conditions.Based on the oblique incidence theory of seismic wave,the case of the oblique incidence of seismic P wave in different V-shaped river valleys was studied.And the seismic response of V-shaped river valleys was discussed under different slope angles of V-shaped river valleys,different incidence angles and different frequencies of P wave.The results show that the lower slope angles of V-shaped Valley has a smaller seismic response,the V-shaped Valley has the largest seismic response when the incident angle of the seismic wave is 60 degree,and the seismic response is the largest when the frequency of the seismic wave is close to the natural frequency of the valley.