地震波斜入射对高拱坝地震反应的影响
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摘要
高坝地震反应分析通常假定地震波垂直入射,在显式有限元法结合黏弹性人工边界的时域波动分析方法的基础上,建立了三维平面地震波倾斜入射的输入方法。采用所建立的斜入射输入方法,研究了地震波斜入射对小湾拱坝地震反应的影响。分析结果表明:与垂直入射相比,地震波倾斜入射可能显著增加对拱坝抗震安全性起控制作用部位位移、速度、加速度反应的频谱幅值放大系数,应该在拱坝地震反应分析中考虑地震波斜入射的影响。
In seismic response analysis of high dam,the incidence of plane seismic waves is usually considered as vertical.To improve this assumption,an input method of oblique plane seismic waves for three-dimensional calculation is proposed in the frame of time-domain wave method that couples explicit finite-element method with viscous-spring artificial boundary condition.The new method was applied to the Xiaowan arch dam,and the effect of incidence angle was examined.The results show that in comparison with vertical incidence,oblique incidence of seismic waves may cause significant increases in the amplitude amplification factors of displacement,velocity and acceleration at key locations of the arch dam.Thus this study suggests that oblique incidence should be accounted in the response analysis.
In seismic response analysis of high dam,the incidence of plane seismic waves is usually considered as vertical.To improve this assumption,an input method of oblique plane seismic waves for three-dimensional calculation is proposed in the frame of time-domain wave method that couples explicit finite-element method with viscous-spring artificial boundary condition.The new method was applied to the Xiaowan arch dam,and the effect of incidence angle was examined.The results show that in comparison with vertical incidence,oblique incidence of seismic waves may cause significant increases in the amplitude amplification factors of displacement,velocity and acceleration at key locations of the arch dam.Thus this study suggests that oblique incidence should be accounted in the response analysis.
引文
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[2]Xiuli Du,Yanghong Zhang,Boyan Zhang.Nonlinear seismic response analysis of arch dam-foundation systems———part I dam-foundation rock interaction[J].Bulletin of Earthquake Engineering,2007,38(5):105～119.
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[7]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417～1423.CHEN Houqun.Discussion on seismic input mechanism at dam site[J].Journal of Hydraulic Engineering,2006,37(12):1417～1423.(in Chinese)
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[9]李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:中国地震局工程力学研究所,1993.LI Xiaojun.Study on the method for analyzing the earthquake response of nonlinear site[D]Harbin:Institute of Engineering Mechanics,China Earthquake Administration,1993.(in Chinese)
[10]吴兆营.倾斜入射条件下土石坝最不利地震动输入研究[D].哈尔滨:中国地震局工程力学研究所,2007.WU Zhaoying.Study of the worst seismic motion input for earth-dam seismic stability under the oblique incidence condition[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2007.(in Chinese)
[11]张如林,楼梦麟.基于FLAC3D的斜入射地震波作用的数值模拟方法研究[J].土木工程学报,2010,43(S1):22～27.ZHANG Rulin,LOU Menglin.Study on numerical simulation of obliquely incident seismic waves based on FLAC3D[J].China Civil Engineering Journal,2010,43(S1):22～27.(in Chinese)
[2]Xiuli Du,Yanghong Zhang,Boyan Zhang.Nonlinear seismic response analysis of arch dam-foundation systems———part I dam-foundation rock interaction[J].Bulletin of Earthquake Engineering,2007,38(5):105～119.
[3]杜修力,王进廷.拱坝-可压缩库水-地基地震波动反应分析方法[J].水利学报,2002,33(6):83～90.DU Xiuli,WANG Jinting.Analysis method for seismic response of arch dam-compressible water-foundation systems[J].Journal of Hydraulic Engineering,2002,33(6):83～90.(in Chinese)
[4]Xiuli Du,Jin Tu.Nonlinear seismic response analysis of arch dam-foundation systems———part II opening and closing contact joints[J].Bulletin of Earthquake Engineering,2007,5:121～133.
[5]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49～56.DU Xiuli,ZHAO Mi,WANG Jinting.A stress artificial boundary in fea for near-field wave problem[J].Chinese Journal of Theoretical and Applied Mechanics,2006,38(1):49～56.(in Chinese)
[6]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006,37(9):1063～1069.DU Xiuli,ZHAO Mi.Analysis method for seismic response of arch dams in time domain based on viscous-spring artificial boundary condition[J].Journal of Hydraulic Engineering,2006,37(9):1063～1069.(in Chinese)
[7]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417～1423.CHEN Houqun.Discussion on seismic input mechanism at dam site[J].Journal of Hydraulic Engineering,2006,37(12):1417～1423.(in Chinese)
[8]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213～1219.PAN Danguang,LOU Menglin,FAN Lichu.Status of seismic response analysis of long-span structures under multiple support excitations[J].Journal of Tongji University.2001,29(10):1213～1219.(in Chinese)
[9]李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:中国地震局工程力学研究所,1993.LI Xiaojun.Study on the method for analyzing the earthquake response of nonlinear site[D]Harbin:Institute of Engineering Mechanics,China Earthquake Administration,1993.(in Chinese)
[10]吴兆营.倾斜入射条件下土石坝最不利地震动输入研究[D].哈尔滨:中国地震局工程力学研究所,2007.WU Zhaoying.Study of the worst seismic motion input for earth-dam seismic stability under the oblique incidence condition[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2007.(in Chinese)
[11]张如林,楼梦麟.基于FLAC3D的斜入射地震波作用的数值模拟方法研究[J].土木工程学报,2010,43(S1):22～27.ZHANG Rulin,LOU Menglin.Study on numerical simulation of obliquely incident seismic waves based on FLAC3D[J].China Civil Engineering Journal,2010,43(S1):22～27.(in Chinese)
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