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Geometrical dimensions effects on the seismic response of concrete gravity dams

机译:几何尺寸对混凝土重力坝地震反应的影响

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This study presents the effects of geometrical dimensions of concrete gravity dams on the seismic response considering different base width/dam height (L/H) ratios. In the study, a concrete gravity dam with the height of 200 m is selected and finite element models of the dam are constituted including five different L/H ratios such as 0.25, 0.5, 0.75, 1.00, 1.25. All dams are modeled in ANSYS software considering dam-reservoir-foundation interaction. 1989 Loma Prieta earthquake records are applied to models in upstream-downstream direction and linear time history analyses are performed. Dynamic equilibrium equations of motions obtained from the finite element models of the coupled systems are solved by using Newmark time integration algorithm. The seismic response of the models is evaluated from analyses presenting natural frequencies, mode shapes, displacements and principal stresses. The results show that the L/H ratios considerably affect the seismic response of gravity dams. Also, the model where L/H ratio is 1.00 has more desirable results and most appropriate representation of the seismic response of gravity dams.
机译:这项研究提出了考虑不同基础宽度/坝高(L / H)比的混凝土重力坝的几何尺寸对地震反应的影响。在研究中,选择了高度为200 m的混凝土重力坝,并构建了包括五个不同的L / H比(例如0.25、0.5、0.75、1.00、1.25)的坝的有限元模型。考虑大坝-水库-地基相互作用,所有大坝均在ANSYS软件中建模。 1989年将Loma Prieta地震记录应用于上游-下游方向的模型,并进行了线性时程分析。通过使用Newmark时间积分算法求解从耦合系统的有限元模型获得的运动的动态平衡方程。该模型的地震响应是通过对呈现固有频率,振型,位移和主应力的分析进行评估的。结果表明,L / H比在很大程度上影响了重力坝的地震响应。此外,L / H比为1.00的模型具有更理想的结果,并且最能代表重力坝的地震响应。

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