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Response analysis of flexible MDF systems for multiple-support seismic excitations

✍ Scribed by Nobumichi Yamamura; Hiroshi Tanaka

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
640 KB
Volume
19
Category
Article
ISSN
0098-8847

No coin nor oath required. For personal study only.

✦ Synopsis

Two practical approaches, response spectrum and time-history methods, are developed to evaluate the response of flexible multi-degree-of-freedom (MDF) systems, notably long-span bridges, to multiple-support seismic excitations. For practical convenience, ground motions within a group of adjacent supports on continuous soil or rock are assumed to be uniform and synchronized, while those of different groups are treated as non-uniform and uncorrelated. The response spectrum analysis is extended to include the cross-correlation of modal responses, which prove important when closely spaced modal frequencies exist. An example of the significance of multiple-support excitations is illustrated by application to a suspension bridge. Qualitatively comparable effects can be expected for other bridges of similar type or dimensions.

*Chief technical supervisor. 'Senior Structural Engineer.

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