大跨度中承式拱桥时域抖振分析  

Buffeting Analysis for Long Span Half-Through Arch Bridges in Time Domain

作　　者：晏致涛[1] 李正良[1] 祁仁俊 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆江北城开发建设公司,重庆400020

出　　处：《湖南大学学报（自然科学版）》2008年第1期21-25,共5页Journal of Hunan University:Natural Sciences

基　　金：重庆市科委攻关项目(CYB-DQ-H-0002)

摘　　要：根据大跨度中承式拱桥的三维空间结构形式及主拱风荷载相互干扰的特点,提出了抖振响应的非线性时域分析方法.通过节段模型风洞试验,确定了前后拱在相互干扰下的静力三分力系数.结合试验得出的两榀拱的抖振力时程数据,求出前后拱在相互干扰下的脉动风速功率谱.采用谐波合成法模拟大跨度中承式拱桥的三维风场,通过FFT变换、功率谱插值等技术提高了模拟效率.以重庆菜园坝长江大桥为工程实例,进行了考虑几何非线性的时域抖振分析,计算结果与风洞试验结果吻合较好.According to the features of the structural style and the wind load interaction between two arches, a nonlinear time domain method of long span half-through arch bridge buffeting analysis was proposed. Based on the section model wind tunnel tests, the static force coefficients of two fore-and-aft arches were measured. According to the time history buffeting forces measured by wind tunnel tests, turbulent wind power spectrum density on two fore - and - aft ai-ches were analyzed. The three dimension wind fields for long span arch bridges were simulated in the wave superposition method. By means of the Fast Fourier Transform （FFT） and PSD interpolation, the efficiency was promoted. The buffeting analysis of Chongqing Yangzi River Bridge in time domain, which was used as a numerical simulated example, was carried out. A comparison of the calculated results with those obtained by wind tunnel tests has showed little difference between them.

关 键 词：拱桥 抖振 时域分析 风效应 风洞 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]