Wind Field and Structural Performance of Sutong Bridge under Typhoon 'Haikui'

摘要

Sutong Bridge was the first cable-stayed bridge in the world with a main span longer than one thousand meter, thus had a milestone meaning in the development of bridge engineering. Due to its super long span of 1088m, wind resistance problems had been focused with great attentions during bridge design. After the opening of the bridge, the wind field around the bridge has been observed and it was found that wind induced vibration had not been a significant problem although the bridge had gone through several serious typhoon attacks. In last year, the typhoon "Haikui" had generated an obvious influence on Sutong Bridge. In this paper, the distribution characteristics of the wind field around Sutong Bridge under the influence of typhoon "Haikui" which happened in August, 2012, were studied and investigated. Thus, the structural response of Sutong Bridge was obtained and analyzed based on its structural health monitoring system (SHMS). The results showed that, the maximum wind speed at bridge deck under this typhoon was 24.0m/s and the lateral deformation of bridge deck was the largest response which was 19cm. It was also found that, when the wind speed was larger than 14m/s, the vibration of the bridge will be dominated by wind excitation. Through comparison with results obtained from wind tunnel tests, the response of the bridge agreed well with the results which were predicted by full aeroelastic bridge model tests.