摘要
利用高频天平技术,在两类不同风场中对14个角部进行了切角或圆角处理的方形截面高层建筑模型进行了测力风洞试验,分析风场湍流和切角或圆角大小对高层建筑的气动基底弯矩和扭矩系数的影响规律。试验结果表明,切角和圆角处理对气动基底弯矩和扭矩系数都有很大的影响;对于顺风向与横风向基底弯矩系数,在相同的切角和圆角率下,圆角比切角效果要好;但是对于基底扭矩系数,切角效果更好。基于试验数据,拟合得到不同切角和圆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。
A total of 14 square tall building models with chamfered comers or rounded corners were tested using high frequency force balance （HFFB） technique in two different simulated wind fields, to obtain aerodynamic base force coefficients. The effects of turbulence intensities and corner cut ratios on mean and RMS coefficients of the aerodynamic base moment and torque in typical wind directions were analyzed. The test results indicate that chamfered and rounded corner modifications have dramatic effects on the aerodynamic coefficients of base moment and torque. At the same comer cut ratio, For the mean and RMS coefficients of the downwind and across-wind aerodynamic base moment, with the same corner cut ratio, the effect of rounded corner is better; while for the aerodynamic base torque coefficient, chamfered comer is better. Empirical formulae are fitted for aerodynamic force coefficients of square tall buildings with different comer recession ratios, providing technical supports for the revisions and supplements of load codes.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第9期12-20,共9页
China Civil Engineering Journal
基金
国家自然科学基金(51278367
90715040
50878159)
关键词
基底气动力系数
切角
经验公式
圆角
风洞试验
aerodynamic force coefficients
chamfered corner
empirical formula
rounded corner
wind tunnel test
