混凝土重力坝整体抗震及破坏特性分析
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摘要
强震荷载作用下混凝土重力坝各坝段间的动力相互作用不可忽视。利用能考虑混凝土软化特性并可反映实际损伤能量耗散的混凝土塑性损伤本构模型,通过建立重力坝整体3维有限元模型,考虑地基辐射阻尼作用和坝体接缝非线性动力接触作用,采用时域分析方法对官地碾压混凝土重力坝进行整体3维非线性地震反应分析,研究大坝整体抗震特性,得到大坝的损伤破坏区域及抗震薄弱部位,揭示横河向地震输入对大坝地震反应的影响。研究表明:考虑坝段间的动力相互作用后,大坝整体抗震性能得到提高;考虑横河向地震输入后,大坝的动力响应及损伤破坏范围均有所增大。
The effect of dynamic interaction between adjacent monoliths should be considered under strong loading conditions.A damage mechanics model associated with strain softness after post-peak for concrete was proposed to reflect reasonable damage dissipation of concrete fracturing.A three-dimensional integral dam FEM model was established to analyze the seismic response and the integral anti-seismic characteristics of Guandi RCC gravity dam,with the consideration of the energy radiation and dynamic contact of the monoliths.The damage region and the seismic weak parts were obtained.The influence of the cross-stream ground motion input was discussed.The results showed that the integral seismic performance of dam is improved with consideration of the dynamic contact of the monoliths.Considering the cross-stream ground motion input,the dynamic response and damage region are increased.
The effect of dynamic interaction between adjacent monoliths should be considered under strong loading conditions.A damage mechanics model associated with strain softness after post-peak for concrete was proposed to reflect reasonable damage dissipation of concrete fracturing.A three-dimensional integral dam FEM model was established to analyze the seismic response and the integral anti-seismic characteristics of Guandi RCC gravity dam,with the consideration of the energy radiation and dynamic contact of the monoliths.The damage region and the seismic weak parts were obtained.The influence of the cross-stream ground motion input was discussed.The results showed that the integral seismic performance of dam is improved with consideration of the dynamic contact of the monoliths.Considering the cross-stream ground motion input,the dynamic response and damage region are increased.
引文
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[3]Wang Haibo,Yang Huichen.Seismic analysis of concretegravity dam with 3D full-dam model[J].Journal of Hydroe-lectric Engineering,2011,30(6):133-137.[王海波,杨会臣.混凝土重力坝全坝段三维动力分析[J].水力发电学报,2011,30(6):133-137.]
[4]Cervera M,Oliver J,Manzoli O.A rate-dependent isotropicdamage model for the seismic analysis of concrete dams[J].Earthquake Engineering and Structural Dynamics,1996,25(9):987-1010.
[5]Lee J,Fenves G L.A plastic-damage concrete model forearthquake analysis of dams[J].Earthquake Engineeringand Structural Dynamics,1998,27(9):937-956.
[6]ABAQUS,Inc.ABAQUS/Standard user’s manual[M].Ver-sion 6.10.Providence,RI,2010.
[7]Lee J,FenvesG L.Plastic-damage model for cyclic loading ofconcrete structures[J].Journal of Engineering Mechanics,1998,124(3):892-900.
[8]Liao Zhenpeng,Huang Kongliang,Yang Baipo,et al.Transi-ent wave transmission boundary[J].Science in China:SeriesA,1984(6):556-564.[廖振鹏,黄孔亮,杨柏坡,等.暂态波透射边界[J].中国科学:A辑,1984(6):556-564.]
[9]Du Xiuli,Zhao Mi,Wang Jingting.A stress artificial bounda-ry in FEA for near-field wave problem[J].Chinese Journalof Theoretical and Applied Mechanics,2006,38(1):49-56.[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.]
[10]Du Xiuli,Zhao Mi.Analysis method for seismic response ofarch dams in time domain based on viscous-spring artificialboundary condition[J].Journal of Hydraulic Engineering,2006,37(9):1063-1069.[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.]
[11]Zhang Sherong,Huang Hu.Analysis on seismic response ofhigh intake tower group considering the effect of travelingwave[J].Journal of Hydraulic Engineering,2009,40(9):1120-1126.[张社荣,黄虎.考虑地震行波效应的大型水电站高耸进水塔群响应分析[J].水利学报,2009,40(9):1120-1126.]