CAJ | 학술논문

用高频测力天平技术，对不同锥度比的方形截面高层建筑进行了风洞试验，分析了锥度比、湍流度和风向角对方形截面高层建筑基底弯（扭）矩系数、基底弯（扭）矩谱密度与基底弯（扭）矩间相关性的影响．试验结果表明：锥度化措施能减小方形截面高层建筑基底弯（扭）矩系数幅值25％以上，但不能改变基底气动力随风向角的变化规律；锥度化措施能减小所有折减频率范围内顺风向与扭转向基底弯矩谱，但只能减小低频区域横风向基底弯矩谱和谱峰高度，却增大旋涡脱落频率和高频区横风向基底弯矩谱；随来流湍流度增大，锥度化措施对风荷载的抑制效果减弱；折减频率在0．10到0．15时，锥度化措施能增大横风向基底弯矩与基底扭矩间的相关性．
용고빈측력천평기술，대불동추도비적방형절면고층건축진행료풍동시험，분석료추도비、단류도화풍향각대방형절면고층건축기저만（뉴）구계수、기저만（뉴）구보밀도여기저만（뉴）구간상관성적영향．시험결과표명：추도화조시능감소방형절면고층건축기저만（뉴）구계수폭치25％이상，단불능개변기저기동력수풍향각적변화규률；추도화조시능감소소유절감빈솔범위내순풍향여뉴전향기저만구보，단지능감소저빈구역횡풍향기저만구보화보봉고도，각증대선와탈락빈솔화고빈구횡풍향기저만구보；수래류단류도증대，추도화조시대풍하재적억제효과감약；절감빈솔재0．10도0．15시，추도화조시능증대횡풍향기저만구여기저뉴구간적상관성．
Square tall buildings with different taper ratios were tested using the high frequency force balance (HFFB ) technique in two different simulated wind fields. The effects of taper ratio, turbulence intensity and wind direction on aerodynamic base moment and torque coefficients,the power spectrum densities (PSD)of along- and across-wind base moments and torques,and the correlation between base moment and torque were analyzed systematically. The test results indicate that tapering of square tall buildings can reduce the amplitudes of the aerodynamic base moment and torque coefficients by 25% or more,but can not change the law of aerodynamic wind loads varying with wind directions. The tapering measure can reduce the PSDs of along-wind base moment and torque within all the reduced frequencies,but it can only reduce the spectral peak value of the PSD of across-wind base moment in low frequency region,and increase the frequency of the vortex shedding and the PSD value in high frequency region. With the turbulence intensity increasing,the effect of the tapering measure becomes weak. The coherence between across-wind base moment and torque is increased by the tapering measure when the reduced frequency is between 0 . 10 and 0 . 15 .