NONSTATIONARY ANALYSIS OF SUSPENSION BRIDGES FOR MULTIPLE SUPPORT EXCITATIONS . DEVELOPMENTS IN STRUCTURAL ENGINEERING. PROCEEDINGS OF THE FORTH RAIL BRIDGE CENTENARY CONFERENCE, HERIOT-WATT UNIVERSITY, ENDINBURGH, SCOTLAND, AUGUST 21-23, 1990. VOLUMES 1 AND 2

A method for the nonstationary response analysis of suspension bridges subjected to earthquake ground excitations at multiple supports is developed in this paper. The equation of motion is formulated for the vertical motion of the bridge girder using a continuous coordinate system. The nonstationarity of the earthquake excitation is modelled by utilizing a time varying envelope function. The correlation effects between ground excitations at different supports are investigated, for various cases of travelling seismic waves with different wave propagation velocities. The nonstationary responses are obtained in terms of time dependent variance functions. Expected peak responses are also evaluated thereafter. Numerical results from example analysis indicate that the correlation effects between different support excitations play a very important role in the response of the suspension bridge. In general, uncorrelated support motions give conservative responses. On the other hand, fully correlated support excitations yield very unconservative responses. It is also found that the effect of the horizontal (earthquake) component on the responses of the suspension bridge is more significant than that of the vertical component. (TRRL)

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    Spon (E and FN) Limited

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  • Authors:
    • Hyun, C-H
    • Yun, C-B
    • Shinozuka, M
  • Publication Date: 1990

Language

  • English

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  • Accession Number: 00609512
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-419-15240-7
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1991 12:00AM