基于现场实测的润扬悬索桥桥址区台风与强北风特性对比(英文)

Comparable study on typhoon and strong northern wind characteristics of the Runyang Suspension Bridge based on field tests

综合利用润扬结构健康监测系统(SHMS)风环境子系统实时记录的各种参数时程数据以及强风期间上桥实测强风样本,分析得到了桥址区实测强风的风速和风向、紊流强度、紊流积分尺度、紊流功率谱密度函数等特性,重点对比研究了台风与强北风特性之间的差异性.结果表明,与台风相比,强北风的平均风速略小、平均风向更加稳定;台风与强北风的实测紊流强度值均比规范建议值大;台风与强北风的紊流积分尺度之间无明显的规律性;就顺风向紊流功率谱而言,强北风与Kaimal谱更加吻合.研究结果为建立桥址区台风特性数据库,确定当地强风特性参数的合理取值提供了实测依据.

The strong wind characteristics of the Runyang Suspension Bridge（ RSB） including the wind speed and direction, the turbulence intensity, the turbulence integral length and power spectrum are analyzed based on measurement data from the wind environment monitoring subsystem of the structural health monitoring system （SHMS）of the RSB and field tests during strong winds. The differences between the typhoon and the strong northern wind are especially studied. It is found that the mean wind speed of the strong northern wind is a little smaller and the mean wind direction is more stable than that of the typhoon. The turbulence intensity of both the typhoon and the strong northern wind is greater than the values suggested in Chinese code, and the turbulence integral length difference between the typhoon and a strong northern wind is not clear. As for the along-wind turbulence power spectrum, the spectrum of the strong northern wind can fit the Kaimal spectrum better than that of the typhoon. The obtained results can provide measurement data for founding a strong wind characteristic database and determining the strong wind characteristic parameter values of the RSB.