摘要
鉴于紊流空间相关系数尚难以准确获取的现状,以泰州长江公路大桥为研究对象,采用谐波合成法模拟了该桥的三维脉动风场,并基于ANSYS平台进行了该桥非线性抖振响应时域分析。在研究过程中,以Davenport相干函数中的无量纲衰减因子λ为控制参数,重点分析了紊流空间相关系数对大跨度三塔悬索桥风致抖振响应的影响。研究结果表明,紊流空间相关系数对桥梁抖振响应影响较大,主梁跨中侧向与扭转位移响应随着衰减因子的增大而减小,竖向抖振位移响应随着衰减因子的增大而略有增加,且不同的衰减因子λ所造成的抖振响应计算值的差值可达50%以上。结论可供大跨度三塔悬索桥的风致抖振研究参考。
In order to obtain the accurate spatial correlation coefficients of turbulent flow and to investigate its effect on buffeting responses of bridge,the Taizhou Yangtze River Highway Bridge was taken as a reasearch example.The three-dimensional fluctuating wind field of the bridge was simulated with the harmonic synthetic method.And the nonlinear buffeting analysis on the bridge was conducted in time domain based on the ANSYS.In the research the dimensionless decay factor λof Davenport correlation function was set as the control parameter and the influence of the spatial correlation coefficient of fluctuating wind on wind-induced buffeting responses of the long-span triple-tower suspension bridge was analysed.The results show that the spatial correlation coefficient of fluctuating wind has great influence on the wind-induced buffeting responses of bridge.The lateral and torsional buffeting displacements at the mid-span decrease with the augment of the decay factor,while the vertical one increases only slightly when the decay factor turns larger.The difference of buffeting responses caused by various decay factors could reach 50%.The results can provide references to the wind-induced buffeting analysis of long-span triple-tower suspension bridges.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第10期202-206,224,共6页
Journal of Vibration and Shock
基金
国家973计划青年科学家专题(2015CB060000)
国家自然科学基金项目(51378111)
教育部新世纪优秀人才支持计划资助项目(NCET-13-0128)
霍英东青年教师应用研究项目(142007)
同济大学桥梁结构抗风技术交通行业重点实验室开放课题资助项目(KLWRTBMC12-02)
关键词
三塔悬索桥
紊流空间相关系数
抖振响应
风场模拟
相干函数
triple-tower suspension bridges
turbulence spatial correlation coefficient
buffeting response
wind field simulation
correlation function
