表面粗糙度对超高层建筑风荷载与风振响应的影响

发布时间：2018-10-20 20:47

【摘要】：为了研究表面粗糙度对高层建筑风荷载与风振响应的影响,选取粗糙条、砂纸两种改变模型表面粗糙度的方法,进行方形建筑刚性模型同步测压风洞试验,获得不同粗糙度工况下模型的表面风压分布特征,在此基础上分析了其气动力系数、气动力功率谱和风振响应.研究表明:高层建筑的表面风荷载与粗糙条的间距、厚度有一定的关系,在突出系数小于0.4%时,影响不明显;砂纸可明显减小中间层迎风面的平均风压、侧风面和背风面的平均风压绝对值,以及脉动风压,但会增大顶部迎风面的平均风压和负压区的平均风压绝对值(影响率均在25%以内);表面粗糙度对顺风向气动力功率谱的影响较小,但会使横风向漩涡脱落的周期略降低(5%以内),涡激力减小.建筑物表面的局部突出在一定范围内可略减小建筑风荷载和风振响应,建筑物表面的粗糙化处理总体上有利于结构抗风.
[Abstract]:In order to study the influence of surface roughness on wind load and wind vibration response of high-rise building, two methods of changing the surface roughness of the model were selected, which were rough strip and sandpaper, and the wind tunnel test of square building rigid model was carried out simultaneously. The surface wind pressure distribution characteristics of the model under different roughness conditions are obtained, and the aerodynamic coefficient, aerodynamic power spectrum and wind-induced vibration response are analyzed. The results show that the wind load on the surface of high-rise building has a certain relationship with the spacing and thickness of the rough strip, and the influence is not obvious when the outburst coefficient is less than 0.4, and the sand paper can obviously reduce the mean wind pressure of the windward surface of the intermediate layer. The mean absolute value of the mean wind pressure and pulsating wind pressure on the sidewind and leeward surfaces, However, the mean wind pressure on the top upwind surface and the average wind pressure absolute value in the negative pressure region will be increased (the influence rate is less than 25%), and the surface roughness has little effect on the downwind aerodynamic power spectrum. However, the period of wind vortex shedding will be reduced slightly (within 5%), and the vortex-induced force will be reduced. The local outburst of the building surface can slightly reduce the wind load and the wind-induced vibration response of the building within a certain range, and the roughening of the building surface is beneficial to the wind resistance of the structure in general.
【作者单位】：中南大学土木工程学院;中南大学高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金青年科学基金资助项目(51208524,2017JJ2318) 湖南省自然科学基金青年基金资助项目(12JJ4055) 湖南省高校创新平台开放基金(14K104)~~
【分类号】：TU973.213

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