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wave passage and incoherency effects on seismic response of high arch dams

Earthquake Engineering and Engineering Vibration 2012年第4期11卷 567-578页

作者： H. Mirzabozorg M. Akbari M. A. Hariri Ardebili Department of Civil Engineering K.N.Toosi University of Technology

The effects ofincoherency and wave-passage on the nonlinear responses of concrete arch dams are investigated in this study. A double curvature arch dam is selected as a numerical example. The reservoir is modeled as a compressible material and the foundation is modeled as a massless medium. Ground motion time-histories are artificially generated using the Monte Carlo simulation approach. Four different finite element models （FEM） are considered： uniform excitation; incoherence effect; wave passage effect; and both incoherence and wave passage effects. It was revealed that modeling multiple-supports excitation could have a significant impact on the structural response of the dam by inducing a pseudo-static effect. Also, it was concluded that the coherency effect overshadows the wave passage effect and the results obtained from non-uniform excitation of FEM, including the wave passage effect, is close to the results of the FEM when it is uniformly excited.

关键词： concrete arch dam incoherency nonlinear analysis wave passage

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Influence of earthquake ground motion incoherency on multi-support structures

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Earthquake Engineering and Engineering Vibration 2002年第2期1卷 167-180页

作者：杨庆山 M.Saiid Saiidi 王航 Ahmad Itani School of Civil Engineering and Architecture Northern Jiaotong University.Beijing.100044.China. Department of Civil Engineering University of NevadaRenoNV89557USA Beijing General Municipal Engineering Design and Research Institute.China Department of Civil Engineering University of Nevada.RenoNV.89557USA

A linear response history analysis method is used to determine the influence of three factors:geometric incoherency,wave-passage,and local site characteristics on the response of lnulti-support structures subjected to differential ground motions.A one-span frame and a reduced model of a 24-span bridge,located in Las Vegas,Nevada are studied,in which the influence of each of the three factors and their combinations are *** is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response,which does not exist in structures subjected to uniform *** total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation.

关键词： earthquake bridges ground motion incoherency wave passage local site characteristics multi-support structures

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