高进水塔地震波斜波入射有限元分析
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摘要
在水工结构抗震动力分析中,反应谱和时程分析都是基于地震波垂直入射来考虑地震荷载的影响,而实际地震波的传播方向往往是斜波入射。斜入射地震波会引起地面运动的非一致变化,从而对结构产生很大的影响。基于波动理论和黏弹性人工边界波动输入方法,采用有限元模拟地震波斜波入射,并比较在45°斜波入射情况下进水塔与基岩接触的上游建基面、塔背回填混凝土与塔身接触位置等关键部位的顺水流向和竖向加速度、位移、应力时程曲线,结果表明,采用黏弹性人工边界等效荷载方法可以实现地震波斜入射的输入,计算结果与理论分析结果一致。
In hydraulic structure seismic dynamic analysis,response spectrum and time history analysis are based on normal incidence seismic wave simulation the impact of the earthquake in the specification.The actual direction of seismic waves are often obliquely incident waves,which cause the ground motion of non-uniform changes and have a significant impact on the structure.Based on the wave motion theories and visco-elastic artificial boundary seismic wave data input methods,finite element method was used to simulate of seismic wave oblique wave incidence.The downstream flow and the vertical direction acceleration,displacement and stress time history were compared with 45 degrees seismic wave oblique wave incidence of the key parts of the high intake tower,such as the bedrock foundation surface contact with the intake tower upstream and backfilling concrete position of intake towers.The numerical simulation results show that the visco-elastic artificial boundary equivalent load method can realize obliquely incident of seismic waves,the calculation results are consistent with the theory analysis.
In hydraulic structure seismic dynamic analysis,response spectrum and time history analysis are based on normal incidence seismic wave simulation the impact of the earthquake in the specification.The actual direction of seismic waves are often obliquely incident waves,which cause the ground motion of non-uniform changes and have a significant impact on the structure.Based on the wave motion theories and visco-elastic artificial boundary seismic wave data input methods,finite element method was used to simulate of seismic wave oblique wave incidence.The downstream flow and the vertical direction acceleration,displacement and stress time history were compared with 45 degrees seismic wave oblique wave incidence of the key parts of the high intake tower,such as the bedrock foundation surface contact with the intake tower upstream and backfilling concrete position of intake towers.The numerical simulation results show that the visco-elastic artificial boundary equivalent load method can realize obliquely incident of seismic waves,the calculation results are consistent with the theory analysis.
引文
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[3]姜燕,乐金朝.动水动土共同作用下重力坝的地震响应分析[J].人民黄河,2010,32(2):105-106.
[4]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[5]刘晶波,王艳.成层半空间出平面自由波场的一维化时域算法[J].力学学报,2006,38(2):219-225.
[6]杜修力.工程波动理论与方法[M].北京:科学出版社,2009.
[7]杜修力,赵密,王进廷.近场波动模拟的应力人工边界条件[J].力学学报,2006,38(1):49-56.
[8]赵密.粘弹性人工边界及其与透射人工边界的比较研究[D].北京:北京工业大学,2004.
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