DYNAMICS OF MULTI-SPAN CONTINUOUS STRAIGHT BRIDGES SUBJECT TO MULTI-DEGREES OF FREEDOM MOVING VEHICLE EXCITATION
✍ Scribed by S. MARCHESIELLO; A. FASANA; L. GARIBALDI; B.A.D. PIOMBO
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 304 KB
- Volume
- 224
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
The paper presents an analytical approach to the problem of vehicle}bridge dynamic interaction. Starting from early studies based on a simply supported beam interacting with a lumped mass moving at constant speed, in recent years researchers have improved the models of both the bridge and the vehicle. On this basis, the bridge is modelled here as a multi-span continuous isotropic plate; its response to external loads is de"ned by applying the mode superposition principle and takes into account both #exural and torsional mode shapes, the latter being usually neglected in the literature. The plate is considered proportionally damped and its modes are computed by means of the Rayleigh}Ritz method. The scheme adopted for the vehicle consists of a seven degrees-of-freedom system moving at constant speed over the isotropic rough bridge surface. The numerical investigation, based on these analytical models, refers to a three-span bridge and includes the importance of torsional mode shapes, of road surface irregularities and of vehicle speed.