超高层建筑在风重耦合作用下响应分析

风重耦合效应是指高耸结构在风荷载作用下水平变形会受到重力的影响．为了有效分析超高层结构的风重耦合效应,文中建立了结构计算模型,推导了结构在风荷载和重力荷载共同作用下的动力方程,对结构自振周期、风振系数以及结构响应值的风重耦合效应影响系数进行计算与分析．参数分析表明:考虑风重耦合作用后结构自振周期变长,风振系数减小,同时超高层结构的重刚比、弯剪刚度比和竖向外形锥度的增长会加大风重耦合效应．建议对重刚比较大、体型复杂的超高层建筑进行风重耦合计算．

Analysis of response of extra-high buildings acted by wind load and gravity

Wind-gravity coupling effect(WGCE)is horizontal deformation that is caused by wind and enlarged by gravity. In order to analyze WGCE of extra-high building structure, the model of structure was established and derivation of dynamic equations was presented in the paper. WGCE coefficients of structure frequency, wind fluttering factor and response of structure were calculated and analyzed. The result shows that natural period of vibration becomes longer and wind vibration factor decreases as WGCE is taken into account in the calculation. WGCE will become evident if gravity-rigidity ratio, bending-shearing ratio and taper of tall building structure increase. It is suggested to take into account WGCE when calculating the structure of extra-high building with large gravity-rigidity ratio and complex sharp.