矩形高层建筑表面风压特性研究

发布时间：2018-06-09 22:23

本文选题：高层建筑 + 矩形截面　；参考：《建筑结构学报》2016年10期

【摘要】：通过刚性模型风洞测压试验,对短边迎风和长边迎风时的矩形截面高层建筑表面风压特性及作用机理进行研究。对比了不同风向角下建筑表面风压分布及相关特性:短边迎风时,锥形涡是建筑侧面风压脉动的主要诱因,侧面脉动风压较大值出现在底边缘附近的瓣状区域内,该区域内风压互相关性显著;长边迎风时,旋涡脱落是导致建筑侧面风压脉动的主要因素,侧面吸力较大值集中在迎风前缘附近,且风压横向互相关性突出。基于风压时程的高阶矩,探讨了建筑表面风压非高斯脉动特性:短边迎风时,风压非高斯区位于迎风面角部、锥形涡作用区及尾流作用区;长边迎风时,非高斯区位于侧面迎风前缘附近的分离区。分析了建筑侧面脉动风压谱和风压相干性,结果表明:短边迎风时,建筑侧面风压脉动能量主要集中在低频段,风压强相干区域仅存在于迎风前缘附近;长边迎风时,旋涡脱落使得建筑侧面脉动风压谱和风压横向相干函数均在折减频率0.1处出现峰值,加之该频率所对应相位角接近0°,使得建筑侧面出现强烈且同步的风压脉动;短边迎风和长边迎风时锥形涡及旋涡脱落在建筑两侧诱导产生的风压脉动均为反相位,对结构抗风较为不利。
[Abstract]:In this paper, the wind pressure characteristics and action mechanism of rectangular high-rise building with short and long edges are studied by wind tunnel test with rigid model. The distribution of wind pressure on the building surface under different wind direction angles and its related characteristics are compared. When the short side is upwind, the conical vortex is the main inducement of the wind pressure pulsation on the side of the building, and the larger value of the wind pressure on the side of the building appears in the flap region near the bottom edge. The vortex shedding is the main factor leading to the wind pressure pulsation of the building side, and the lateral suction is concentrated near the front edge of the upwind, and the cross-correlation of the wind pressure is obvious. Based on the high order moments of wind pressure history, the characteristics of non Gao Si pulsation of wind pressure on the building surface are discussed. The non Gao Si region of wind pressure is located at the corner of the upwind surface, the conical vortex zone and the wake acting zone, and the long edge windward zone. The non-Gao Si region is located near the front edge of the lateral windward. The spectrum of fluctuating wind pressure and the coherence of wind pressure on the side of building are analyzed. The results show that when the short side is upwind, the fluctuating energy of the wind pressure on the side of the building is mainly concentrated in the low frequency band, and the coherent region of the wind pressure exists only near the front edge of the wind, and when the long side is upwind, Vortex shedding makes the peak value of fluctuating wind pressure spectrum and transverse coherence function of wind pressure at the reduced frequency 0.1, and the phase angle of the frequency is close to 0 掳, which results in strong and synchronous wind pressure pulsation on the side of the building. The wind pressure pulsation induced by the conical vortex and vortex shedding on both sides of the building is inverse phase, which is unfavorable to the wind resistance of the structure.
【作者单位】：同济大学建筑设计研究院(集团)有限公司;同济大学土木工程学院建筑工程系;
【基金】：国家自然科学基金青年基金项目(51408353) 上海市青年科技启明星计划(15QB1404800)
【分类号】：TU973.213

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