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| Vibration response analysis of long-span footbridge to random walking loads generated by crowds |
| Received:September 17, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20105012 |
| KeyWord:pedestrain footbridge vibration random vibration walking the pseudo excitation method |
| Author | Institution |
| 李泉 |
清华大学 土木工程系 土木工程安全与耐久教育部重点实验室,北京 |
| 樊健生 |
清华大学 土木工程系 土木工程安全与耐久教育部重点实验室,北京 |
| 聂建国 |
清华大学 土木工程系 土木工程安全与耐久教育部重点实验室,北京 |
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| Abstract: |
| Excessive vibrations have become a major serviceability consideration in long-span footbridge with notable characteristics of light weight, high flexibility, small damping and low natural frequency. Based on the vertical walking load model and the multi-point loading model, the paper develops the fine time domain method to calculate footbridge vibration response excited by pedestrain, and further the more convenient spectral analysis method. In the spectral analysis, firstly, the vertical force time history in the standing point is formulated; then the load power spectrum is obtained by FFT technique; finally, the root-mean-square acceleration, which reflects walking comfort, is analytically deduced by the pseudo excitation method (PEM) brought forward by Professor Lin Jiahao. According to comparison of the two methods above, the paper validates the effectiveness and efficiency of the spectral analysis method. |
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