矩形高层建筑横向湍流脉动风压谱密度函数的分析计算

目的 为计算矩形高层建筑在湍流脉动风压作用下横风向风振动力反应值，推求横向湍流脉动风压谱密度函数．方法 从湍流理论的基本方程出发，在一定假设条件下，根据Taylor关于湍流的“冻结”假定，从湍流基本方程的傅氏变换解可以导出脉动风压谱密度函数的计算公式，并考虑了全部的剪切项．结果 据此计算出的结果在一定条件下其组合值与原型观测数据相吻合．结论 湍流脉动风压谱与日本规范中的扰力谱幅频特性有差别．可以采用CFD（Computational Fluid Dynamics）风场数值模拟结果计算湍流脉动风压谱密度函数与均方根值．

An Analytical Solution to the Spectral Density Function of Across-Wind Load Fluctuation on Rectangle High Rise Buildings

An analytical solution to spectral density function of across-wind load fluctuation acting on the structure flank is presented from the original fluid movement equation in turbulence theory under certain assumptions.The spectral density function of wind load fluctuation could be derived from the CFD wind average velocity and fluctuating velocity distribution according to Taylor's Frozen Assumption of turbulence.All the T-M contributions have been taken into account in the analysis process.This could be regarded as an effective verification of the datum from wind tunnel test and datum from full scale observation.The analysis of structure dynamic response induced by this kind of wind load fluctuation could then be achieved without the expensive wind tunnel test.