摘要
风重耦合效应是指高耸结构侧向变形受到风和重力共同影响而引起结构动力特性发生变化的现象。为了研究风重耦合效应的作用机理,建立了结构几何非线性动力方程。对于顺风向风振,可以将方程分解为平均风作用下方程和脉动风作用下方程,脉动方程是非线性方程,其系数与平均风作用下结构位于相关。利用等效线性法可以将脉动方程转化为线性方程求解,最后通过随机振动理论获得结构响应解。计算结果表明:结构重刚比是影响风重耦合效应最重要的因素,顺风向脉动风产生的结构顶部的位移、速度、加速度响应以及底部弯矩响应变化量随着重刚比增大而增大,而对底部剪力响应没有影响。
Wind-gravity coupled effect（WGCE）is a phenomenon that dynamic characters of tall and slender structures are affected by both wind and gravity.In order to study the action mechanism of WGCE,the geometric nonlinear dynamic equation of a tall structure was built.The dynamic equation under load along wind could be divided into a equation under average wind load and the other one under pulse wind load.The latter was a nonlinear equation whose parameters were relative to the structural displacements calculated under average wind.The equation under pulse wind could be converted into a linear ont to be solved with the equivalent linearization method.The results showed that gravity-rigidity ratio is an important factor on WGCE;the displacement,velocity,acceleration on the top of the structure, and the moment at the bottom of the structure increase with increase in gravity-rigidity ratio while the shear at the bottom of the structure does not change.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第11期178-182,共5页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(51378468)
关键词
超高层建筑
风重耦合效应
非线性振动
风振
extra-high buildings
non-linear vibration
wind-induced vibra-tion
