论文部分内容阅读
为了研究不同风场下低矮房屋墙面的风压分形特性,利用分形理论分析风洞中A,B,C类风场下低矮房屋墙面的风压盒维数,对比分析了风压变异系数、风压系数功率谱与风压盒维数的关系.结果表明:风场类别的变化会引起风压盒维数的变化,背风面之外的3墙面风压变异系数的增大使得风压自相似性减小,风压盒维数减小;背风面风压时程的变化主要由漩涡脱落控制,风压自相似性相对更大,风压盒维数更大;风压系数功率谱的能量相对越集中,则风压时程的自相似性越大,风压盒维数也越大.
In order to study the fractal characteristics of the wind pressure on low-rise buildings in different wind fields, fractal theory was used to analyze the dimensions of wind-pressure boxes on low-rise buildings in wind tunnels of type A, B and C, The coefficient of variation, the power spectrum of the wind pressure coefficient and the dimension of the pressure box.The results show that the change of the wind field category will lead to the change of the dimension of the pressure box, the increase of the coefficient of variation of the wind pressure outside the leeward side The self-similarity of wind pressure is reduced and the dimension of wind-pressure box is reduced. The variation of wind-pressure duration of leeward surface is mainly controlled by shedding of vortex, the self-similarity of wind pressure is relatively larger and the dimension of wind-pressure box is larger; The energy of the coefficient power spectrum is relatively concentrated, the greater the self-similarity of the wind pressure time history is and the larger the dimension of the wind pressure box is.