基于长期监测数据的苏通大桥桥址区风特性研究

Wind characteristics of Sutong bridge based on long-term monitored data

苏通长江大桥地处我国东部沿海地区,自2008年5月建成通车至今,其结构健康监测系统(SHMS)已采集到一年多的风特性数据。为建立桥址区风特性数据库,通过对现场实测数据的分析,得到10min平均风速年最大值的风玫瑰图、紊流强度、紊流积分尺度以及紊流功率谱函数等风特性。结合与桥梁抗风规范建议值的比较,总结了桥址区的风特性及其规律。研究结论为苏通大桥的抗风安全性评价提供了实测依据,同时可为该地区其他工程结构的抗风研究提供参考。

Located in the coastal area of eastern China,the structural health monitoring system of Sutong Bridge has collected more than one year's wind data since the opening of the bridge in May 2008.In order to build the wind characteristic database of the bridge spot,the measured data were analyzed to obtain the wind rose plots of the annual maximum 10-min mean wind velocity,the turbulence intensity,the turbulence integral length and its power spectrum,etc.Comparing with the suggested values of the bridge wind-resistance codes,the wind characteristics and rules of the bridge spot were summarized.The results could provide the measured basis for the wind-resistance evaluation of Sutong Bridge,and provide a reference for the wind-resistance study on other engineering structures in the region.