Research Article
Apr 1982
Suspension Bridge Response to Multiple-Support Excitations
Publication: Journal of the Engineering Mechanics Division
Volume 108, Issue 2
Abstract
The earthquake-induced vertical response of suspension bridges when subjected to, correlated or uncorrelated, multiple-support excitations is analyzed by means of random vibration theory. Appropriate ground motions describing the basic inputs to such structures are defined through finite Fourier transforms of existing recorded ground displacements at locations within distances similar to the spans of such structures. Spectral correlation analysis of the multiple-support excitations are estimated via these Fourier transforms. It is found that studies of earthquake-induced vertical motion of suspension bridges need to take into account the influences of ground excitations in the longitudinal directions of such bridges. An example is presented in which the response of an existing bridge (in a seismically active area) to earthquake ground motions with characteristics significantly different at the supports is examined. It is observed that the participation of higher modes in the total response is essential to reliably assess the seismic behavior of such structures and that the response values associated with correlated multiple-support excitations are significantly different from those obtained through the uncorrelated case.
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Published In
Journal of the Engineering Mechanics Division
Volume 108 • Issue 2 • April 1982
Pages: 419 - 435
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Apr 1982
Published online: Feb 3, 2021
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Ahmed M. Abdel-Ghaffar, AM.ASCE
Asst. Prof., Civ. Engrg. Dept., Princeton Univ., Princeton, N.J.
Lawrence I. Rubin
Grad. Student, Civ. Engrg. Dept., Princeton Univ., Princeton, N.J.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.