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| Pseudo-excitation method for internal forces analysis of long-span bridges induced by buffeting |
| Revised:April 12, 2002 |
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| DOI：10.7511/jslx20036125 |
| KeyWord:long-span bridge,buffeting,structural internal forces,multi-mode coupling,random vibration,pseudo-excitation method |
| Liu Gao~ |
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| Abstract: |
| The analysis of buffeting-induced internal forces for long-span bridges is one of the important tasks in wind resistant design. Currently, the structural buffeting-induced internal forces are usually computed with the static analysis approach by presenting buffeting loading in the form of equivalent static load. In this paper, the pseudo-excitation method (PEM) is applied in the buffeting-induced internal forces analysis, and a high effective computation method is established directly by the random vibration method, which naturally involves the effect of multi-mode coupled vibration. With a long-span cable-stayed bridge as an example, the analysis of the buffeting-induced internal forces is carried out. The computation results show that the internal forces increase when the contributions of high order modes is taken into account, and the peck factors of the internal forces are between 3.4 and 4.0. |
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