任意排列两方形断面高层建筑风致干扰机理研究

发布时间：2018-04-20 23:26

本文选题：方形断面高层建筑 + 任意排列　；参考：《建筑结构学报》2014年12期

【摘要】：风致干扰效应是高层建筑群抗风设计中的常见难点问题之一。采用刚性模型测压试验,研究了均匀层流和两种大气边界层风场条件下任意排列两方形断面高层建筑的风致干扰效应,通过平均和脉动基底弯矩系数的干扰因子、风力系数、风压系数分布以及风荷载功率谱的研究,解释了其风致干扰效应的机理。结果表明,任意排列的两方形断面高层建筑风致干扰中,至少存在横风向静力干扰、顺风向静力干扰和横风向动力干扰三个值得注意的干扰区域。窄道形成的加速效应使受扰结构上形成指向施扰建筑横风向平均吸力和阻塞形成的受扰建筑的横风向平均推力;遮挡效应使得受扰建筑承受指向位于上游的施扰建筑的顺风向风力;漩涡叠加增强位于尾流区受扰建筑上的横风向脉动荷载。不同风场的试验结果表明,提高来流的紊流度有助于减弱上述干扰效应。
[Abstract]:Wind-induced disturbance is one of the most difficult problems in the wind-resistant design of high-rise buildings. In this paper, the wind-induced interference effects of high-rise buildings with arbitrary arrangement of two square cross-sections under uniform laminar flow and two kinds of atmospheric boundary layer wind field are studied by using rigid model pressure measurement test. Through the interference factor of average and pulsating base moment coefficient, the wind force coefficient is studied. The distribution of wind pressure coefficient and the study of wind load power spectrum explain the mechanism of wind disturbance effect. The results show that there are at least three noticeable disturbance areas in the arbitrary arrangement of wind disturbance in tall buildings with two square cross-section: static disturbance in crosswind direction static disturbance in downwind direction and dynamic disturbance in crosswind direction. The acceleration effect of narrow channel formation makes the disturbed structure form the mean suction pointing to the cross wind direction of the disturbed building and the average cross wind thrust of the disturbed building formed by blocking. The blocking effect makes the disturbed building bear the wind wind in the direction of the upstream disturbed building, and the vortex superposition enhances the transverse wind pulsating load on the disturbed building in the wake region. The experimental results of different wind fields show that increasing the turbulence of the incoming flow can help to weaken the above disturbance effect.
【作者单位】：石家庄铁道大学河北省大型结构健康诊断与控制实验室;
【基金】：国家自然科学基金项目(51108280) 河北省自然科学基金青年基金项目(E2013210132)
【分类号】：TU312.1

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