凹角对方形截面高层建筑基底气动力系数的影响研究  

Effects of corner recession modification on aerodynamic coefficients of square high-rise buildings

作　　者：张正维[1,2] 全涌[1] 顾明[1] 熊勇[3] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]奥雅纳工程咨询(上海)有限公司,上海200031 [3]四川公路桥梁建设集团有限公司勘察设计分公司,四川成都610042

出　　处：《土木工程学报》2013年第7期58-65,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(90715040;50878159)

摘　　要：利用高频天平技术,在两类不同风场中对14个角部进行凹角处理的方形截面高层建筑模型进行测力风洞试验,分析风场湍流和凹角大小对典型风向角下气动基底弯矩和扭矩系数的均值及均方根值的影响规律。试验结果表明,两类凹角处理对气动基底弯矩和扭矩系数有较大的影响,凹角的尺寸为边长的7.5%时能够最大程度地减小基底气动力系数。基于试验数据,拟合得到不同凹角率下方形截面高层建筑的基底气动力系数经验公式,为荷载规范的修订和补充提供参考。With High-Frequency Force Balance （HFFB） technique, 14 square high-rise building models with corner recession were tested in two different simulated wind fields to obtain aerodynamic forces. The effects of turbulence intensities and corner recession ratios on mean and RMS coefficients of the aerodynamic base moment and torque in typical wind directions were analyzed. The test results indicate that two types of corner recessions have dramatic effects on the aerodynamic coefficients of base moment and torque, and the model with a corner recession ratio of 7.5% is the best one in cutting down the aerodynamic force coefficients. Empirical formulae are fitted for aerodynamic force coefficients of square high-rise buildings with different corner recession ratios, providing technical support for the revisions and supplements of load codes.

关 键 词：基底气动力系数 凹角 经验公式 高层建筑 风洞试验 

分 类 号：TU973.213[建筑科学—结构工程] TU317.1