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地震波斜入射作用下重力坝地震响应分析

Seismic Response Analysis of Gravity Dam Under Oblique Incident Seismic Wave
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摘要 为了研究地震波斜入射作用下重力坝的地震响应,本文基于黏弹性边界及相应的地震动输入方法,分别推导了P波和SV波倾斜入射时的等效地震力,构建了考虑地震波斜入射的黏弹性静-动力统一型人工边界.以黄登混凝土坝为研究对象,研究了P波和SV波在不同斜入射角度下混凝土坝的地震响应,重点分析了重力坝在地震作用下的水平、竖直相对位移与主应力.研究结果表明:混凝土重力坝的地震响应中在斜入射情况下P波与SV波有明显的差异,考虑地震波的斜入射很有必要;P波斜入射时,随着入射角度的增加,坝体关键点的水平、竖直相对位移与主应力值逐渐增加(60°时达到最大);SV波斜入射时随着角度的增加关键点相对位移与坝体主应力变化不大,但整体来看入射角度为0°时(即垂直入射)与其他入射角度相比无论是竖直、水平相对位移或坝体关键点主应力均为最大. In order to study the seismic response of gravity dam under oblique incidence of seismic waves,based on the viscous-spring boundary and the corresponding ground motion input method,the equivalent seismic forces of P wave and SV wave with oblique incidence are derived respectively.The unified viscous-spring static-dynamic artificial boundary with oblique incidence of seismic wave is constructed.Taking the Huangdeng concrete dam as the research object,the dynamic response of concrete dam under reservoir water and seismic load at different oblique incidence angles of P wave and SV wave is studied.The horizontal and vertical relative displacement and principal stress of gravity dam during an earthquake are analyzed.The results show that there is a significant difference between P wave and SV wave in the seismic response of concrete gravity dam under oblique incident,therefore,it is necessary to consider the oblique incident of seismic wave.When P wave is incident at an oblique angle,the horizontal and vertical relative displacements and principal stress values of key points in the dam increase gradually as the incident angle increases(i.e.,they reach the maximum at 60°).When SV wave is incident at an oblique angle,the relative displacement of the key points and the principal stress of the dam body remain relatively stable as the angle increases.However,when the incident angle is 0°(i.e.,the vertical incident angle),compared with other incident angles,both the vertical and horizontal relative displacements and the principal stress at the key point of the dam body are at their maximums.
作者 陈灯红 曾怡阳 赵艺园 刘云龙 岳梦 CHEN Denghong;ZENG Yiyang;ZHAO Yiyuan;LIU Yunlong;YUE Meng(Hubei Key Laboratory of Disaster Prevention and Mitigation(China Three Gorges University),Yichang 443002,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)
出处 《三峡大学学报(自然科学版)》 北大核心 2024年第1期14-22,共9页 Journal of China Three Gorges University:Natural Sciences
基金 国家自然科学基金项目(52079072) 土木工程防灾减灾湖北省引智创新示范基地项目(2021EJD026)。
关键词 黏弹性边界 斜入射 重力坝 地震响应 地震动输入 viscous-spring boundary oblique incidence gravity dam seismic response ground motion input
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