强台风登陆过程大跨桥梁风特性特征及其抖振响应分析  

Wind field characteristics and wind-induced buffeting response of a long-span bridge during the landing of a strong typhoon

作　　者：赵林[1,2] 吴风英 潘晶晶[1] 宋丽莉 葛耀君[1,2] ZHAO Lin;WU Fengying;PAN Jingjing;SONG Lili;GE Yaojun(State Key Lab of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Transport Industry of Wind Resistant Technology for Bridge Structures,Tongji University,Shanghai 200092,China;Chinese Academy of Meteorological Sciences,Beijing 100081,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学桥梁结构抗风技术交通运输行业重点实验室,上海200092 [3]中国气象科学研究院,北京100081

出　　处：《空气动力学学报》2021年第4期86-97,共12页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(52078383,52008314);土木工程防灾国家重点实验室自主课题(SLDRCE19-B-11)。

摘　　要：台风环境条件的风场特征对沿海大跨桥梁结构的风致响应影响显著。结合强台风黑格比(0814)的登陆演变全过程风场逐时记录数据,对台风气候条件下的实测近地平均风特性(平均风速、风向角和风攻角)和脉动风功率谱进行了统计分析,研究了中心过境强台风的风场演变特征。随后分别采用规范谱和实测台风谱对位于台风影响区内的一座大跨斜拉桥(主跨448 m)进行了三维风致抖振响应分析,研究了台风演变过程中桥梁结构抖振响应特征。采用实测台风谱计算的桥梁抖振响应与仅考虑规范谱的结果差异显著。进一步研究了来流大攻角效应对桥梁抖振响应的影响,结果显示,结构竖向和扭转抖振位移分别为仅考虑规范谱响应结果的204.12%和264.87%,横向位移增加67.27%。研究表明:强台风气候条件下,来流大攻角和高频湍流能量卓越的脉动风速对桥梁抖振响应影响突出。因此,关于桥梁风致抖振的相关研究亟需慎重对待,并应加强桥梁风致安全评估。Characteristics of typhoon wind fields have a predominant influence on the wind-induced response of large-span bridges.Based on the time-history records of the strong typhoon Hagupit(0814)which passed through the territory of China,statistical analysis and comparative study were conducted on the measured data including the mean wind speed,wind direction,angle of attack,and pulsating wind power spectrum during the landing.Subsequently,in order to explore the buffeting response of bridge structures induced by strong typhoons,the specification spectrum and the measured typhoon spectrum were applied to study the three-dimensional wind-induced buffeting response of a long-span cable-stayed bridge with a main span 448 m in the typhoon-prone area.The results of buffeting response calculated by the measured typhoon spectrum and the specification spectrum show considerable differences.Furtherly,considering the impact of large angle-of-attack wind fields on the bridge buffeting response,the vertical and torsional displacements were 204.12% and 264.87% of the results of bridge buffeting responses by only considering the specification spectrum.The results show that the buffeting responses,even for medium-span bridges,would be significantly affected by large angle of attack and pulsating wind power with large high-frequency turbulence energy under typhoon environments.

关 键 词：台风登陆过程 现场实测 大攻角效应 脉动风功率谱 风致抖振响应 

分 类 号：TU279.72[建筑科学—建筑设计及理论]