摘要
基于风洞试验实测的风参数采用改进谐波合成法模拟了杭州湾跨海大桥全桥风场.风场模拟涉及的风参数主要包括脉动风谱和空间相关函数,对风洞中的风场参数进行了实测拟合并应用于风场模拟当中.谐波合成法模拟大跨桥梁的风场耗时过长、应用不便,用拉格朗日插值法改进谐波合成法可大大提高风场模拟效率,编制了基于改进谐波合成法的风场模拟流程图和相应程序Improved-WAWS,为大跨桥梁的风场模拟提供了切实可行的方法.试验结果表明:衰减因子λ在不同间距D时,存在一定差异,且随风速U的增加,衰减因子不断增加;用改进谐波合成法模拟的风速样本时程的功率谱、互功率谱、相关函数及互相关函数与相应目标值吻合良好.
Turbulent wind field of the Hangzhou Bay Bridge is simulated by improved WAWS with wind field parameters measured in wind tunnel. Wind field parameters involved in wind field simulation include mainly turbulent wind power spectrum density and spatial -correlation function, which is measured and applied to wind simulation. Simulating wind field of long - span bridges must overcome the problem of accounting quantity, and Lagrange interpolation can improve WAWS and enhance simulation efficiency. The flow chart is put forward for the turbulent wind field simulation on the basis of improved spectral representation and correspond- ing programming is written, which provide the feasible method to wind field simulation of long - span bridges. Testing results show that decay factor varies with spatial distance D different and increase with mean wind velocity adding. And power spectrum density, cross power spectrum density, correlation function and cross correlation function of simulated wind velocity sample coincide with corresponding target ones.
出处
《郑州大学学报（工学版）》
CAS
2008年第1期56-60,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(50578014)
关键词
风场模拟
谐波合成法
衰减因子
拉格朗日插值
wind field simulation
spectral representation
decay factor
Largrange interpolation
