高层建筑结构考虑平移和扭转时的位移风振系数

Gust Loading Factor of Displacement for Tall Buildings Considering the Influence of Translation and Torsion

风荷载是高层建筑结构的主要侧向荷载。不对称结构在风荷载作用下,将引起平移和扭转的耦合运动。本文根据随机振动理论,针对高层结构的特点,导出位移风振系数公式。这样,在平均风下的静力位移或层间内力乘以导出的位移风振系数,即可很方便地得到平均风和脉动风共同作用下的响应。有关参数已制成计算图表,可供实际应用。

Wind action is a main lateral loading for tall buildings. Under the action of wind loading, motion coupled with translation and torsion will occur for unsymmetrical structures. In this paper, on the basisof random vibration theory and characteristics of tall buildings, formulas of the gust loading factors of displacement have been derived.Thus, if the calculated values of static displacements or internalforces between stories under mean wind loading are multiplied by this gust loading factor of displacement, the results will be identical to those obtained by considering both the mean wind loadingand the fluctuating wind loading. For design purposes, tables of parameters involved in formulas presented by this paper have been worked out.