环境风场长期作用下某大跨悬索桥抖振疲劳寿命分析

发布时间：2018-09-13 07:13

【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。
[Abstract]:In order to investigate the buffeting fatigue of long-span suspension bridge under the environmental wind field for a long time, based on the wind field monitoring system of a long-span suspension bridge in the East China Sea, the average wind speed at the bridge site was continuously observed. The distribution of wind speed and wind direction of fatigue wind at bridge position is discussed, and based on wind speed decomposition, a time-domain analysis method of buffeting fatigue of structure considering wind direction is put forward, and the East China Sea suspension bridge is taken as an example. The results show that the distribution of fatigue wind speed is positive skew and can be fitted by Weibull distribution, and the fatigue damage of the bridge stiffened beam is very sensitive to the change of wind speed. According to the distribution of fatigue wind speed wind direction at bridge location, the occurrence probability and duration of wind speed of each direction are obtained. The fatigue life of the stiffened beam is much longer than the design life of bridge structure for 100 years.
【作者单位】：重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;重庆交通大学土木建筑学院;大连理工大学土木工程学院;
【基金】：国家自然科学基金重点资助项目(90815022) 山区桥梁与隧道工程国家重点实验室培育基地(重庆交通大学)开放基金资助项目(CQSLBF-Y13-7)
【分类号】：U448.25;U441.4

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