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MOVING FORCES IDENTIFICATION ON A MULTI-SPAN CONTINUOUS BRIDGE

✍ Scribed by X.Q. ZHU; S.S. LAW

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 305 KB
Volume: 228
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.1999.2416

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✦ Synopsis

A continuous bridge is modelled as a multi-span continuous Timoshenko beam with non-uniform cross-section. The vibration behaviour of this beam subjected to moving loads is analyzed by Hamilton's principle with the intermediate point constraints represented by very sti! linear springs. A method based on the modal superposition and optimization technique is developed to identify the moving forces in the time domain. The damped least-squares method is used in the identi"cation to provide bounds to the results. The errors in the moving force identi"cation are discussed in the paper. Both computation simulations and laboratory tests show that the method is e!ective for identifying the moving loads using di!erent combinations of measured responses 1999 Academic Press # (x) * (x, t) *t dx, ; C " 1 2 * EI(x) * (x, t) *x # GA(x) *y(x, t) *x ! (x, t) dx,

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