不规则结构扭转风荷载
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摘要
对具有"靴型"造型的超高层建筑进行多点同步测压风洞试验,详细研究该类建筑的扭转风荷载.引入扭转向等效力偶的概念,比较扭转向等效力偶与水平风荷载之间的大小关系.结果表明:等效力偶与水平风荷载量级相当.比较分析各测点层平均和均方根扭矩系数随风向角的变化关系,发现两者都与截面的厚宽比有着密切的联系.最后,采用最小二乘法对超高层建筑扭转层风荷载规格化功率谱曲线进行了拟合,并通过拟合曲线直观反映了扭转风荷载受层高、厚宽比等参数的影响规律.
The torsional wind loads of the super high-rise buildings with the boot-like shape are researched by implementing the multi-point synchronous pressure test on the building.The concept of torsional equivalent couples is introduced to be compared with the corresponding lateral wind loads,and the result shows that they have equivalent importance.By comparing and analyzing the relationship between each average distribution law and root mean square of torque coefficients under different wind incidence angles,it suggests that both of them have a tight relationship with structure thickness-width ratio.Finally,the normalized power spectrum density of the torque wind load for super high-rise buildings is fitted with the least squares method and the correlation between the power spectrum to the story height or structure thickness-width ratio can be directly reflected.
The torsional wind loads of the super high-rise buildings with the boot-like shape are researched by implementing the multi-point synchronous pressure test on the building.The concept of torsional equivalent couples is introduced to be compared with the corresponding lateral wind loads,and the result shows that they have equivalent importance.By comparing and analyzing the relationship between each average distribution law and root mean square of torque coefficients under different wind incidence angles,it suggests that both of them have a tight relationship with structure thickness-width ratio.Finally,the normalized power spectrum density of the torque wind load for super high-rise buildings is fitted with the least squares method and the correlation between the power spectrum to the story height or structure thickness-width ratio can be directly reflected.
引文
[1]GIOVA S.Mathematical model to predict 3-D windloading on buildings[J].Journal of EngineeringMechanic,1985,111(2):254 275.
[2]KWOK K C S,MELBOURNE W H.Wind-inducedlock-in excitation of tall structures[J].Journal ofStructural Division,ASCE,1981,107(ST1):57 72.
[3]ISYUMOV N,POOPLE M.Wind induce torque onsquare and rectangular building shapes[J].Journal ofWind Engineering and Industrial Aerodynamics,1983,1/2/3(13):183 196.
[4]LIANG S G,LI Q S,LIU S C,et al.Torsional dynamicwind loads on rectangular tall buildings[J].EngineeringStructures,2004,26:129.
[5]唐意,顾明,全涌.高层建筑的扭转风荷载功率谱密度[J].同济大学学报:自然科学版,2007,35(4):435 439.TANG Yi,GU Ming,QUAN Yong.Power spectral densi-ties of torsional wind loads on tall buildings[J].Journal ofTJU:Natural Science,2007,35(4):435 439.
[6]金虎,楼文娟,沈国辉.X型超高层建筑扭转风荷载谱计算模型研究[J].空气动力学学报,2009,27(2):147 153.JIN Hu,LOU Wen-juan,SHEN Guo-hui.Computationalmodel investigation of torsional wind load on high-risebuilding with X-shape.[J].Acta Aerodynamica Sinica,2009,27(2):147 153.
[7]梁枢果,刘胜春,张亮亮,等.矩形高层建筑扭转动力风荷载解析模型[J].地震工程与工程振动,2003,23(3):74 80.LIANG Shu-guo,LIU Sheng-cun,ZHANG Liang-li-ang,et a1.Analytical model of torsional dynamic windloads on rectangular tall buildings[J].Earthquake Engi-neering and Engineering Vibration,2003,23(3):74 80.
[8]NING L,LETCHFORD C,TAMURA Y,et al.Char-acteristics of wind forces acting on tall buildings[J].Journal of Wind Engineering and Industrial Aerodynam-ics,2005,93(3):217 242.
[9]Recommendations for load on buildings and commentaries[S].Tokyo:Architectural Institute of Japan,1996.
[10]KAREEM A.Acrosswind response of buildings[J].Journal of Structural Division,ASCE,1982,108(ST4):869 887.
[2]KWOK K C S,MELBOURNE W H.Wind-inducedlock-in excitation of tall structures[J].Journal ofStructural Division,ASCE,1981,107(ST1):57 72.
[3]ISYUMOV N,POOPLE M.Wind induce torque onsquare and rectangular building shapes[J].Journal ofWind Engineering and Industrial Aerodynamics,1983,1/2/3(13):183 196.
[4]LIANG S G,LI Q S,LIU S C,et al.Torsional dynamicwind loads on rectangular tall buildings[J].EngineeringStructures,2004,26:129.
[5]唐意,顾明,全涌.高层建筑的扭转风荷载功率谱密度[J].同济大学学报:自然科学版,2007,35(4):435 439.TANG Yi,GU Ming,QUAN Yong.Power spectral densi-ties of torsional wind loads on tall buildings[J].Journal ofTJU:Natural Science,2007,35(4):435 439.
[6]金虎,楼文娟,沈国辉.X型超高层建筑扭转风荷载谱计算模型研究[J].空气动力学学报,2009,27(2):147 153.JIN Hu,LOU Wen-juan,SHEN Guo-hui.Computationalmodel investigation of torsional wind load on high-risebuilding with X-shape.[J].Acta Aerodynamica Sinica,2009,27(2):147 153.
[7]梁枢果,刘胜春,张亮亮,等.矩形高层建筑扭转动力风荷载解析模型[J].地震工程与工程振动,2003,23(3):74 80.LIANG Shu-guo,LIU Sheng-cun,ZHANG Liang-li-ang,et a1.Analytical model of torsional dynamic windloads on rectangular tall buildings[J].Earthquake Engi-neering and Engineering Vibration,2003,23(3):74 80.
[8]NING L,LETCHFORD C,TAMURA Y,et al.Char-acteristics of wind forces acting on tall buildings[J].Journal of Wind Engineering and Industrial Aerodynam-ics,2005,93(3):217 242.
[9]Recommendations for load on buildings and commentaries[S].Tokyo:Architectural Institute of Japan,1996.
[10]KAREEM A.Acrosswind response of buildings[J].Journal of Structural Division,ASCE,1982,108(ST4):869 887.
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