分缝拱坝的地震响应分析
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摘要
采用非线性有限无法研究了带有横缝的拱坝在ＥｌＣｅｎｔｒｏ波地震作用下的响应。研究中认为坝体混凝土是线弹性体，对于横缝模拟了其连续、张开、闭合、相对滑移以及初始压力等多种受力状态。用有限元和半无限元相结合求解拱坝与库水的动力相互作用问题，算例给出了拱坝关键部位的应力和位移响应，考虑了不同水位、初始压力、抗拉强度等因素的影响，并与相应的线弹性情况的结果进行比较，最后通过综合分析对带有横缝拱坝的地震响应提出了一些有益的看法。
arthquake response of arch dams with transverse joints excited by EI Centro waves is studied with nonlinear FEM.In the study, the elements of the dam body are assamed to be linear elastic.For the joints some nonlinear FEM formulas are derived,and several working states such as the continuity,opening.closing.relative sliding and initial pressure of the joints are considered in the nonlinear FEM model. Dam-water dynamic interactions are solved by combining FE with semi-infinite elements. Dynamic stresses and displacements at the key location of the dam are given in the numerical example. The influence on nonlinear responses of water level,initial pressure and tensile strength of the joints is considered. For comparison,the linear elastic results corresponding to nonlinear cases are also calculated out.After synthetlcal analysis some conclusions are drawn.
arthquake response of arch dams with transverse joints excited by EI Centro waves is studied with nonlinear FEM.In the study, the elements of the dam body are assamed to be linear elastic.For the joints some nonlinear FEM formulas are derived,and several working states such as the continuity,opening.closing.relative sliding and initial pressure of the joints are considered in the nonlinear FEM model. Dam-water dynamic interactions are solved by combining FE with semi-infinite elements. Dynamic stresses and displacements at the key location of the dam are given in the numerical example. The influence on nonlinear responses of water level,initial pressure and tensile strength of the joints is considered. For comparison,the linear elastic results corresponding to nonlinear cases are also calculated out.After synthetlcal analysis some conclusions are drawn.
引文
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