某大跨度拱桥的台风抖振响应分析  

Buffeting responses of a long-span arch bridge under typhoon

作　　者：张建国[1] 温祖坚 姚俊颖 张建霖[1] ZHANG Jianguo;WEN Zujian;YAO Junying;ZHANG Jianlin(School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学建筑与土木工程学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2022年第4期533-539,共7页Journal of Xiamen University：Natural Science

基　　金：福建省自然科学基金(2018J08015)。

摘　　要：沿海大跨度桥梁在台风作用下的抖振响应是造成桥梁构件疲劳破坏的重要原因,也是确定桥梁设计静力风荷载的重要依据.本文对影响厦门地区的台风“苏迪罗”的近地风场特性进行了实测和分析,指出近地台风顺风向和竖直方向的脉动风功率谱密度函数均符合Von-Karman谱的形式.以厦门地区某沿海大跨度拱桥为例,首先采用数值风洞的方法得到了拱桥各主要构件的三分力系数,然后建立了桥梁结构的ANSYS有限元模型并进行了验证,最后基于准定常假设,直接利用台风“苏迪罗”的某时段实测风速时程对拱桥的位移响应进行了时程分析.结果表明,采用本文方法计算沿海桥梁的风致抖振响应可得到较为合理的结果,可作为风洞试验的一种替代方案.As the key factor of fatigue failures in bridge structural members,the buffeting response of long-span bridges in coastal area under typhoon has drawn considerable research attention.In our study,characteristics of the near-ground typhoon"Soudelor"are analyzed.in detail.The power spectrum of wind velocity of near-ground typhoon satisfies the form of Von-Karman spectrum.Drag and lift coefficients of long-span arch bridge members are computed using the finite element method built in ANSYS.Measured typhoon wind velocities are used to represent buffeting wind loads acted on the bridge.Finally,the time-history method is carried out to obtain the response of the bridge.Results show that the buffeting response of bridges in coastal areas can be obtained efficiently and correctly by our simulation procedure.

关 键 词：台风实测 大跨度拱桥 抖振响应 时程分析 

分 类 号：TU311[建筑科学—结构工程]