苏通大桥实测典型台风特性对比分析  

Comparative analysis on measured wind characteristics of typical typhoons at Sutong bridge

作　　者：王浩[1] 邹仲钦 陶天友[1] 茅建校[1] 徐梓栋 Wang Hao　;Zou Zhongqin　;Tao Tianyou　;Mao Jianxiao　;Xu Zidong(Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2018年第2期342-349,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金优秀青年科学基金资助项目(51722804);国家重点基础研究发展计划(973计划)青年科学家专题资助项目(2015CB060000)

摘　　要：为研究台风不同区域风特性的特征及差异,基于苏通桥址区实测"海鸥"与"海葵"台风各72 h的风速样本,开展了风眼经过/未经过桥址区2类台风实测风特性的对比分析.首先,基于矢量分解法对2类台风的平均风速与平均风向进行了对比分析.然后,计算了2类台风的紊流强度、阵风因子和紊流积分尺度,并采用最小二乘法对阵风因子与紊流强度的非线性关系以及紊流积分尺度的概率密度进行了拟合.最后,计算了2类台风的紊流功率谱密度,并与规范推荐的风谱模型进行了对比.研究结果表明,与台风中心更接近的区域紊流强度与阵风因子值更大,紊流积分尺度值更小,且阵风因子与紊流强度之间存在较强的相关性.桥址区紊流功率谱密度不仅与风速大小相关,还与紊流强度大小有关.2类台风的实测风特性参数与规范建议值均存在一定偏差.In order to investigate the features and differences of wind characteristics of typhoon in different regions,a comparative study on the wind characteristics of typhoon whether the typhoon eyes passing by the bridge site or not is carried out based on 72 h measured wind samples of Kalmaegi and Haikui at Sutong bridge.First,the mean wind speeds and the mean wind directions of these two kinds of typhoon are compared by the vector decomposition method.Then,the turbulence intensities,the gust factors and the turbulence integral scales of these two kinds of typhoon are calculated,and the nonlinear relationship between the gust factors and the turbulence intensities as well as the probability density of the turbulence integral scales are fitted by using the least square method.Finally,the turbulence power spectral densities of these two kinds of typhoon are calculated,and compared with the spectral model recommended by the specification.The analytical results indicate that when the measurement field is closer to the typhoon center,the turbulence intensity and the gust factor are larger while the turbulence integral scale is smaller.There is a strong correlation between the gust factor and the turbulence intensity.The power spectral density is related to the mean wind speed and the turbulence intensity.There is a certain deviation between the measured wind characteristics of these two kinds of typhoon and the recommended values by the specification.

关 键 词：台风 风特性 风眼 苏通大桥 现场实测 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] V321[交通运输工程—道路与铁道工程]