摘要
本文采用理论数值模型严格模拟可压缩库水与拱坝、地基间的动力相互作用 ,提出了一种拱坝—可压缩库水—地基系统地震波动反应的时域显式分析方法 .针对位于Ⅸ度地震设防区、坝高 2 92m的小湾高拱坝 ,用本文方法进行了地震动力反应分析 ,得到如下结论 :考虑库水可压缩性将显著降低对小湾拱坝抗震起关键控制作用的部位的动拉应力 ,降低幅值可达 4 5 % ,表明附加质量模型过分夸大了小湾拱坝的地震动应力反应 ,对小湾拱坝的抗震安全评估是不合理的 .
Based on the numerical modeling of the dyanmic interaction among arch dam compressible water foundation, an explicit analysis method for seismic response of arch dam compressible water foundation systems is proposed.The method is applied to calculated the seismic response of Xiaowan arch dam,292m in height.It is concluded that the calculated dynamic tensile stress at crucial area of the dam is about 45% lower than that without consideration of compressiblity of water.it shows that the seismic stress in additional mass model is overestimated.
出处
《水利学报》
EI
CSCD
北大核心
2002年第6期83-90,共8页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目 (5 940 90 0 1
5 973 9180 )
关键词
地震波动
拱坝
可压缩库水
地震反应
arch dam compressible water foundation system
dynamic interaction
seismic response
