P波斜入射下非基岩场地中核岛结构地震响应规律研究

STUDY ON SEISMIC RESPONSES OF NUCLEAR ISLAND STRUCTURE IN NON-BEDROCK SITE UNDER OBLIQUELYINCIDENCE OF P WAVES

随着我国核电产业飞速发展,核电站厂址的选择将不可避免地遇到非基岩场地。针对地震动斜入射下非基岩场地中核电结构抗震问题,建立了包括CAP1400核岛结构和岩土场地的土-结构系统三维有限元模型,基于黏弹性人工边界和斜入射地震动输入方法,研究了P波斜入射角度和非基岩分层场地对核岛结构地震响应的影响规律。研究表明:非基岩场地将增大核岛结构加速度响应和楼层反应谱,多数条件下也将增大楼层相对位移;P波入射角度增大,核岛结构竖向响应减小、水平响应增大,楼层反应谱的频谱特性发生改变。

With the fast development of nuclear power industry in China,it is inevitable to encounter non-rock site during site selection.Focusing on the seismic response of the nuclear island in non-bedrock site under oblique incidence,a three-dimensional finite element model for the soil-structure system including the CAP1400 nuclear island structure and near-field rock site is established.Based on the viscous-spring artificial boundary and oblique incident ground motion input method,the influence of oblique incident angle of P-wave and non-rock layered site on the seismic response of the nuclear island is studied.Research shows that non-bedrock site will increase the acceleration response of the nuclear island structure and its floor response spectrum,and in most conditions will also increase the relative floor displacement;As the incident angle of P wave increases,the nuclear island structural vertical response decreases,the horizontal response increases,and the spectral characteristics of the floor response spectrum will change.