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随着建筑高度的增加,结构自振周期延长,抗侧刚度相对变小,风荷载效应增大。本文以200m高的高层建筑为研究对象,基于风洞试验所得的横风向风压时程数据对其结构进行了计算。试验模型缩尺比为1/400。试验取风向角从0°到45°,每级风向角增量为5°,模拟了两种地面粗糙度。对试验数据进行了迎风面和背风面气动效应的分析。考虑结构第一模态振型发生的位移,由振型分解法按Duhamel积分获得了结构顶点位移和顶点加速度,探讨了结构响应最大值和标准差与风向角、结构自振基频、地面粗糙度等因素的关系。研究表明:风荷载效应与风向角有密切的联系,结构最大响应一般发生在0°。
With the increase of building height, the natural period of the structure is prolonged, the lateral stiffness is relatively smaller and the wind load effect is increased. In this paper, 200m high-rise building is taken as the research object, and its structure is calculated based on wind-induced wind pressure data obtained from wind tunnel test. Experimental model scale ratio of 1/400. The test wind direction angle from 0 ° to 45 °, each level of wind angle increment of 5 °, simulated two kinds of ground roughness. The aerodynamic effects of the windward and leeward surfaces on the experimental data were analyzed. Taking into account the displacement of the first mode of mode structure, the displacement and the acceleration of the structure are obtained by Duhamel integral by mode decomposition method. The maximum and standard deviation of structure response and wind direction angle, fundamental frequency of structure vibration, Degree and other factors. The research shows that the wind load effect is closely related to the wind direction angle, and the maximum response of the structure generally occurs at 0 °.