台风作用下原型实测房的风效应阵风风洞模拟与验证

In this proposal project, active wind gust tunnel tests are conducted to simulate the wind parameters such as fluctuating wind direction, turbulence integral scale and gust factor. The effect of wind parameters on wind pressure in the separated flow regions and conical vortices regions on roofs of low-rise buildings will be evaluated, based on field measurements results. Meanwhile，the extreme wind pressure method for Non-Gaussian distribution for the separated flow regions and conical vortices regions on roofs considering low frequency larger scale turbulence is proposed. On the other hand, the different model scales wind tunnel tests for full scale buildings are conducted to evaluate the Reynolds number on wind pressure on low-rise buildings. The comparison for discrepancies between the model-scale and full-scale results may be caused by several factors and identify the main influence parameters. Moreover, the model test results are compared to the full scale measurements to evaluate the applicability and accuracy of the wind tunnel simulations. Furthermore, model scale pressure measurements are performed to evaluate the building aerodynamic and mechanical measures on mitigating these high suctions for the wind-resistant design of low-rise buildings. The outputs of the project are expected to provide useful information and reference on the wind loads determination for the wind-resistant design of on low-rise buildings and other structures in typhoon-prone regions using active wind tunnel simulation.

拟申请项目基于阵风风洞主动模拟方法，开展脉动风向角、湍流积分尺度及阵风效应等台风风场参数模拟研究，着重分析各湍流参数对平坡和双坡屋面实验房在气流分离和锥形旋涡作用下屋檐和屋脊区域的峰值负压及脉动风压系数的影响机理；探讨各参数对风压概率分布模型的影响，建立考虑低频湍流影响的非高斯极值风压分析方法；同时开展原型实测房不同缩尺比例模型测压实验，研究雷诺数效应对风压实验结果的影响及修正；以现场实测结果为基准，比较分析各湍流参数阵风风洞实验值与现场实测值的差异，评估和检验台风风场低矮建筑风荷载阵风风洞主动模拟方法的适用性和准确性；最后开展低矮建筑体型系数影响参数和减风措施的风洞实验研究；其研究成果可为台风风场低矮建筑和结构抗风设计风洞实验研究提供较好的参考。

低矮建筑的风洞试验通常需要采用大比例尺模型，常规风洞限于风洞截面和边界效应，低频湍流模拟能力缺失，难以满足湍流积分尺度相似性。项目基于阵风风洞主动模拟方法，开展脉动风向角、湍流积分尺度及阵风效应等台风风场参数模拟研究，着重分析各湍流参数对平坡和双坡屋面实验房在气流分离和锥形旋涡作用下屋檐和屋脊区域的峰值负压及脉动风压系数的影响机理；探讨各参数对风压概率分布模型的影响，建立考虑低频湍流影响的非高斯极值风压分析方法；同时开展原型实测房不同缩尺比例模型测压实验，研究雷诺数效应对风压实验结果的影响及修正；以现场实测结果为基准，比较分析各湍流参数阵风风洞实验值与现场实测值的差异，评估和检验台风风场低矮建筑风荷载阵风风洞主动模拟方法的适用性和准确性；最后开展低矮建筑体型系数影响参数和减风措施的风洞实验研究；其研究成果可为台风风场低矮建筑和结构抗风设计风洞实验研究提供较好的参考。