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| Parametric study on wind-induced stability of long-span steel arch bridges under construction |
| Revised:May 15, 2002 |
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| DOI：10.7511/jslx20041011 |
| KeyWord:Long-span steel arch bridges,stability,three components of wind loads,finite element method,nonlinear analysis,parametric study |
| Cheng Jin~ |
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| Abstract: |
| With the increasing span of steel arch bridges, evaluation of wind-induced instability during construction becomes especially important. This study investigates the wind-induced instability of a long-span steel arch bridge with a 550 m-long central span under construction in Shanghai, China. This will be the longest central span among all arch bridges in the world. Both geometric and material nonlinearities are involved in the analysis. Two different construction stages were chosen for this study, namely construction stages I and II. Construction stage I lasts until the closure of the main arch ribs. Construction stage II lasts until all parts have been completed except the stiffening girder of the main span. Three components of wind loads were assumed to act both on the steel girder and the arch ribs in the analysis, namely the drag force, lift force and pitch moment. The results show that the arch bridge is more susceptible to wind-induced instability at the stage II than at the stage I. The effects of various parameters on the wind-induced instability during construction are also discussed. |
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