设有横缝的高拱坝地震反应分析方法
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摘要
文中介绍了两种模拟拱坝径向横缝的力学模型 ,应用非直接对接的自由子结构方法 ,在模态子空间内建立了拱坝地震反应分析的非线性动力方程 ,提出了考虑动水压力影响的近似计算方法 .最后通过算例说明不同径向横缝模型对拱坝地震反应的影响
Two mathematical models for simulating the opening and closing of contraction joints in normal direction in arch dams are presented in this paper. Applying the modal synthesis technique of free\|substructures without directly coupling, the nonlinear equations of motion for seismic response analysis of arch dams is established in the new generalized coordinates spaced by the truncated modes of all monoliths substructures. Furthermore, a new approach, the modal perturbation method, is suggested to calculate approximately the effect of the dynamic pressure on the seismic responses of arch dams. The numerical results of a simple example show that different models of the contraction joints have significant influences on the seismic responses of the arch dams.
Two mathematical models for simulating the opening and closing of contraction joints in normal direction in arch dams are presented in this paper. Applying the modal synthesis technique of free\|substructures without directly coupling, the nonlinear equations of motion for seismic response analysis of arch dams is established in the new generalized coordinates spaced by the truncated modes of all monoliths substructures. Furthermore, a new approach, the modal perturbation method, is suggested to calculate approximately the effect of the dynamic pressure on the seismic responses of arch dams. The numerical results of a simple example show that different models of the contraction joints have significant influences on the seismic responses of the arch dams.
引文
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[1 0 ] 楼梦麟 .具有附加质量矩阵的广义特征值问题的近似解法 [J].大连理工大学学报 ,1 992 ,32 (2 ) :2 31
[2 ] HallJF ,DowlingMJ .ResponseofJointedArchestoEarthquakeExcitation [J].EarthquakeEngineeringandStructuralDynamics ,1 985 ,1 3:779- 7983.
[3] FenvesGL ,etal.ADAP 8AComputerProgramforNonlinearEarthquakeAnalysisofConcreteArchDams[R].ReportNo .UCB/EERC 89/1 2 ,1 989.
[4 ] ChenH ,etal.ModelTestandProgramVerficationonDynamicBehaviorofArchDamwithContractionJoints[R].ReportNo .SVL 94/0 2 ,1 994.
[5 ] 赵光恒 ,杜成斌 .分缝浇筑拱坝的地震响应分析 [J].河海大学学报 ,1 994,2 2 (5 ) :1 - 8.
[6 ] 楼梦麟 .分缝李家峡拱坝的振动台模型试验 [R].大连理工大学土木系抗震研究室研究报告 ,1 992 .
[7] 傅作新 ,张燎军 .考虑有键槽的施工缝时大体积混凝土结构的应力分析 [J].土木工程学报 ,1 994,2 7(4) :6 3- 6 9.
[8] 楼梦麟 .混凝土坝动力分析的自由子结构模态综合法 [J].水利学报 ,1 996 ,(7) :2 3- 30 .
[9] 楼梦麟 ,王东静 .设有纵缝的重力坝地震反应分析方法 [J].水利学报 ,1 997,(7) :78- 83.
[1 0 ] 楼梦麟 .具有附加质量矩阵的广义特征值问题的近似解法 [J].大连理工大学学报 ,1 992 ,32 (2 ) :2 31
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