中文摘要：

为探讨环境风场长期作用下大跨悬索桥的抖振疲劳,基于东海某大跨度悬索桥的风场监测系统,对桥址处的平均风速进行了现场的连续观测,针对两年的实测结果,探讨了桥位处“疲劳风”的风速风向分布规律;同时基于风速分解,提出考虑风向影响的结构抖振疲劳时域分析方法,并以东海悬索桥为对象进行了探讨.结果表明,疲劳风速分布表现为正偏态,同时能很好地采用Weibull分布进行拟合;该桥加劲梁的风振疲劳损伤对风速的变化非常敏感,在运营过程中,强风作用下加劲梁损伤应受到重视;根据桥位处的疲劳风速风向分布,得到各风向风速的发生概率及持续时间,该桥加劲梁的风振疲劳寿命远大于桥梁结构的设计使用期100年.

英文摘要：

To analyze the buffeting fatigue of the long-span suspension bridge under the environmental wind action,the wind field monitoring system was installed on a long-span suspension bridge in the East China Sea and the long-term wind speeds were collected.Based on two years experimental results,the distributions of wind speed at different wind directions were discussed; also the time-domain fatigue analysis method considering the wind direction effect was proposed based on the wind speed decomposition.The suspension bridge in the East China Sea is analyzed in detail and the results indicate that the fatigue wind speed can be well fitted by Weibull distribution.The stiffening girder＇s fatigue is very sensitive to the wind speed and the role of strong winds should be taken seriously,the bridge＇s buffeting fatigue life is much longer than the bridge＇s structural design life of 100 years according to the probability of occurrence and duration of the wind speed in different directions.