地震荷载作用下水电站厂房结构的振动应力分析
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摘要
结合三峡右岸电站某机组段建立了三维数值计算模型,采用有限元与无限元耦合系统模拟水电站厂房结构无限域地基问题并应用时间历程分析法进行地震荷载作用下的动力响应计算。在蜗壳结构外围混凝土发生塑性损伤的基础上,分析了电站厂房在地震动荷载激励下各部位混凝土结构、流道系统金属结构的振动应力峰值。结果表明,地震荷载作用下混凝土结构的振动应力水平较低,对混凝土动力强度复核影响不明显,流道系统金属结构的振动应力水平较低,不会发生因强度不足而引起的破坏。
3-D FE-IE model(3-D finite element and infinite element coupling model) for the hydropowerhouse in the Three Gorges Hydropower Project is set up in utilizing infinite element to model the characteristic of unbounded media.The seismic response of the hydropowerhouse is studied by time-history analyzed method.On the basis that plasticity damage may take place in the concrete surrounding the spiral case,the vibration stresses of concrete and metal parts of the combined structure under earthquake loads were studied numerically.Results show that the maximum vibration stress of concrete and metal parts was low.The destruction will not take place because the intensity is insufficient.
3-D FE-IE model(3-D finite element and infinite element coupling model) for the hydropowerhouse in the Three Gorges Hydropower Project is set up in utilizing infinite element to model the characteristic of unbounded media.The seismic response of the hydropowerhouse is studied by time-history analyzed method.On the basis that plasticity damage may take place in the concrete surrounding the spiral case,the vibration stresses of concrete and metal parts of the combined structure under earthquake loads were studied numerically.Results show that the maximum vibration stress of concrete and metal parts was low.The destruction will not take place because the intensity is insufficient.
引文
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[2]伍鹤皋,蒋逵超,申艳,等.直埋式蜗壳三维非线性有限元静力计算[J].水利学报,2006,37(11):1 323-1 328
[3]张运良,马震岳,王洋,等.混凝土开裂对巨型水电站主厂房动力的影响[J].水利学报,2008,39(8):982-987
[4]Lubliner J,Oliver J,Oller S,et al.A Plastic-DamageModel for Concrete[J].International Journal of Sol-ids and Structures,1989,26(3):299-326
[5]Lee J,Fenves G L.Plastic-Damage Model for CyclicLoading of Concrete Structures[J].Journal of Engi-neering Mechanics,1998,124(8):892-900
[6]黄胜,陈卫忠,杨建平,等.地下工程地震动力响应及抗震研究[J].岩石力学与工程学报,2009,28(3):483-490
[7]Lysmer J,Kuhlemeyer R L.Finite Dynamic Modelfor Infinite Media[J].Jourmal of the EngineeringMechanics,Division,1969,95(4):859-877
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