偏心超高层建筑的风振研究

Research on Wind-Induced Response of Structurally Asymmetric Tall Buildings

摘要:

本文基于结构随机振动理论，考虑了结构振型耦合以及风力相关性的影响，推导了偏心超高层建筑弯扭耦合风振计算公式。利用风洞试验获得的脉动风力数据计算了矩形截面偏心结构的风振响应，从舒适性角度研究偏心位置和截面厚宽比对结构风致振动加速度的影响。研究结果表明，当建筑短边迎风且刚心和质心在顺风向偏离时，风振响应显著增大。

Abstract:

Based on random vibration theory, a method is developed for wind induced lateral-torsion coupled response of structurally asymmetric tall buildings, in which the integrated effects of mode coupling and wind force correlations are also taken into account. Using the wind pressures data on rectangular tall buildings measured with a wind tunnel test, the coupled responses of the rectangular tall buildings are calculated. The effects of eccentricity location and side ratio are also examined for serviceability. The results indicate that the alongwind eccentricity between centers of mass and rigidity for a building whose windward breadth is shorter than it depth may result in a great increase in wind-induced responses.