TIME DOMAIN BUFFETING ANALYSIS OF SUSPENSION BRIDGES SUBJECTED TO TURBULENT WIND WITH EFFECTIVE ATTACK ANGLE
✍ Scribed by Q. DING; P.K.K. LEE; S.H. LO
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 219 KB
- Volume
- 233
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Suspension bridges are long-span #exible structures susceptible to various types of wind-induced vibrations such as bu!eting actions. In this paper, a three-dimensional "nite element model formulated to deal with suspension bridges under turbulent wind with e!ective attack angle is presented. In this model, all sources of geometric non-linearity such as cable sag, force-bending moment interaction in the bridge deck and towers as well as changes in bridge geometry due to large displacements are fully considered. The wind loads which include bu!eting loads and self-excited loads are converted into the time domain by using a computer simulation technique to form aerodynamic damping and sti!ness matrices as well as element loading vectors. Furthermore, a more re"ned model of wind loads is constructed in order to investigate the e!ect of an instantaneous change in e!ective attack angle of turbulent wind on bridge bu!eting response. By comparing the results with those obtained by classic bu!eting theory through an example bridge, the validity of the presented method is veri"ed.