大跨桥梁非平稳台风风场数值模拟与验证  

Numerical simulation and verification of non-stationary typhoon field on long-span bridge

作　　者：武隽[1] 刘焕举 韩万水[1] 史文海[3] 刘晓东 WU Jun;LIU Huan-ju;HAN Wan-shui;SHI Wen-hai;LIU Xiao-dong(School of Highway Engineering,Chang′an University,Xi′an 710064,China;College of Civil Engineering,Hebei University of Engineering,Handan 056038,China;College of Civil Engineering and Architectural,Wenzhou University,Wenzhou 325035,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]河北工程大学土木工程学院,河北邯郸056038 [3]温州大学建筑工程学院,浙江温州325035

出　　处：《振动工程学报》2018年第4期662-670,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金青年基金资助项目(51408053);国家自然科学基金面上项目(51478366);中央高校基本科研业务费自然科学类项目(310821162008)

摘　　要：为实现大跨桥梁非平稳台风风场模拟,系统提出大跨桥梁台风风场模拟验证方法,并基于实测台风数据对进化谱作为风场验证风谱的适用性进行检验。首先提出台风风场模拟方法,基于进化谱理念,获取时变功率谱,采用谐波合成法,对非平稳台风风场进行模拟;其次基于Kaimal风谱和进化谱理论,推导非均匀调制函数,获取非均匀调制进化谱,验证模拟台风风场的合理性;再次基于实测脉动风场特性理论和经验模态分解(EMD)方法,构建非平稳风速模型,获取实测功率谱,对进化谱作为风场验证风谱的适用性进行检验;最后应用提出的台风风场模拟和验证系统方法对某沿海斜拉桥台风风场进行模拟和验证。研究结果表明:实测功率谱与进化谱吻合较好,进化谱适用于台风模拟风场的验证;应用提出的台风风场模拟方法对台风风场进行模拟,模拟风场的功率谱与进化谱吻合非常好,模拟方法合理有效。A simulation and verification system for the typhoon wind field of a long-span bridge is established.Firstly,the simulation method of the typhoon wind field is proposed.Integrating the theory of evolutionary spectrum,the power spectrum is obtained by updating the average wind speed in the Kaimal wind spectrum.The typhoon wind field is simulated by the method of harmonic synthesis.Secondly,based on the Kaimal wind spectrum and the evolutionary spectrum theory,the non-uniform modulation function is derived,and the evolutionary spectrum is obtained by modulation of the Kaimal wind spectrum.The rationality of the simulated wind field is verified by the evolutionary spectrum.Thirdly,based on the measured fluctuating wind field characteristic theory and empirical mode decomposition(EMD)method,the non-stationary wind speed model is constructed,and the measured data is decomposed by vector decomposition to acquire measured power spectrum.The applicability of evolutionary spectrum is tested based on the measured power spectrum for the first time.Finally,the proposed simulation and verification system is applied to the typhoon wind field of a cable-stayed bridge in a coastal area.The results show that the measured power spectrum is in good agreement with the evolutionary spectrum,so the evolutionary spectrum can be used to simulate the wind field.The power spectrum of the typhoon wind field which is simulated by the method of harmonic synthesis with the updated time-varying mean wind speed is in good agreement with the evolutionary spectrum,so the simulation method is reasonable and effective.

关 键 词：桥梁 风场系统模拟方法 谐波合成法 非均匀调制函数 非平稳 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]