CAJ | 학술논문

基于刚性模型的高频天平测力风洞试验，对一外附网架的超高层建筑的基底弯矩和扭矩特性进行了分析，详细讨论了复杂的周边建筑环境和外附网架对近似椭圆形截面目标建筑的整体气动力特性的影响。研究结果表明，复杂周边建筑对目标建筑的气动力均值的影响主要表现为遮挡效应，但在一定条件下可能放大目标建筑所受到的脉动气动力；建筑两侧面绕流区的外附网架所受切向气动力使建筑顺风向气动力均值及脉动值增大，增大的程度与阻挡气流绕流的外附网架面积大小相关；外附网架对建筑表面粗糙度的改变使建筑两侧气流的旋涡脱落强度削弱，导致横风向脉动气动力减小，但对横风向脉动气动力均值没有影响；周期性旋涡脱落引起的外附网架上的脉动风力将部分抵消主体结构上的涡激力脉动导致的结构气动扭矩脉动值，对气动扭矩均值没有明显影响。这些结论为高层建筑的设计提供了参考。
기우강성모형적고빈천평측력풍동시험，대일외부망가적초고층건축적기저만구화뉴구특성진행료분석，상세토론료복잡적주변건축배경화외부망가대근사타원형절면목표건축적정체기동력특성적영향。연구결과표명，복잡주변건축대목표건축적기동력균치적영향주요표현위차당효응，단재일정조건하가능방대목표건축소수도적맥동기동력；건축량측면요류구적외부망가소수절향기동력사건축순풍향기동력균치급맥동치증대，증대적정도여조당기류요류적외부망가면적대소상관；외부망가대건축표면조조도적개변사건축량측기류적선와탈락강도삭약，도치횡풍향맥동기동력감소，단대횡풍향맥동기동력균치몰유영향；주기성선와탈락인기적외부망가상적맥동풍력장부분저소주체결구상적와격력맥동도치적결구기동뉴구맥동치，대기동뉴구균치몰유명현영향。저사결론위고층건축적설계제공료삼고。
With the high frequency force balance (HFFB)technique,a rigid model of an actual grids-attached super-tall building with an approximate ellipse cross section was tested to obtain effects of complex surrounding and attached grids on its base moments and torques.The results indicated that complex surroundings mainly have a sheltering effect on the mean value of aerodynamic force on the principle building;however,it may enlarger the fluctuating aerodynamic force on the principle building under some particular conditions;the tangential aerodynamic force on grids located in flow region of two sides of the principle building enlarges the mean value and RMS of aerodynamic force in along-wind direction,and the increased magnitude is determined by the area of the attached grids obstructing the flow;moreover,the varying of the surface roughness induced by attached grids of the principle building reduces vortex shedding strength,and causes the decrease in fluctuating aerodynamic force in cross-wind direction,and does not affect the RMS of fluctuating aerodynamic force;the fluctuating wind force on attached grids induced by periodic vortex shedding partially offsets fluctuating aerodynamic torque on the main structure induced by fluctuating vortex-induced force,and does not affect the mean value of aerodynamic torque.These conclusions provided a reference for the design of high-rise buildings.