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| Based on P-M spectrum numerical simulation of wave load and dynamic responses of a cross-sea cable-stayed bridge |
| Received:January 02, 2022 Revised:March 19, 2022 |
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| DOI：10.7511/jslx20220102001 |
| KeyWord:wave loads wave spectrum numerical wave tank cable-stayed bridge dynamic response |
| Author | Institution |
| 罗浩 |
湖南科技大学 土木工程学院, 湘潭 |
| 徐楚懿 |
湖南科技大学 土木工程学院, 湘潭 |
| 杨彤麟 |
湖南科技大学 土木工程学院, 湘潭 |
| 郭辉 |
中国铁道科学研究院集团有限公司 铁道建筑研究所, 北京 |
| 郭向荣 |
中南大学 土木工程学院, 长沙 |
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| Abstract: |
| To study bridges subjected to wave loads in the ocean,a cross-sea cable-stayed bridge was taken as an example.Based on the P-M spectrum as the ideal wave spectrum,the numerical simulation of wave spectrum was estimated by Welch algorithm.Compared with the original P-M spectrum,it was shown that the simulation result was good.The fitting error of the power spectrum estimation was 1.22%.In order to accurately analyze the wave loads,a numerical wave tank was established by fluent software,and the numerical waveform was well fitted with the theoretical waveform.Therefore,three different wave conditions are set respectively,and the dynamic response results such as displacement and acceleration of different parts of the bridge under wave impact were obtained.The comparative results show that the longitudinal wave forces of the cable-stayed bridge under wave loads were far less than the lateral wave forces,because the longitudinal wave force was mainly caused by the diffraction effect of the lateral wave impact on the bridge.With the increase of wave height,the peak dynamic response of the cable-stayed bridge gradually increased.The growth rate of peak dynamic response in the mid-span and at the tower top were the highest,the growth rate of peak dynamic response in the secondary side span was the second highest,and the growth rate of peak dynamic response in the side span was the lowest.With the increase of wave load,the lateral displacement response of the tower top increased significantly,and the maximum displacement response of the tower top was 0.0598 m.The time history responses of base shear and moment value increased with the increase of wave load.The related research has some reference significance to the design and dynamic analysis of large-span deep-water bridges. |
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