高层建筑楼顶钢塔风振效应的参数研究

本文针对高层建筑楼顶钢塔的风振效应开展研究，采用线性滤波法模拟了结构的脉动风荷载时程，探讨了主体结构、楼顶钢塔及二者整体工作三种情况的动力特性，分析了脉动风速谱、频率比、楼顶钢塔高度和跨度等6种不同参数对结构顺风向风振动力性能的影响，并对比分析了线性和非线性粘滞阻尼器及粘弹性阻尼器三种速度相关型阻尼器对结构楼顶钢塔风振效应的控制效果。结果表明，结构楼顶钢塔设计时应避开主体结构的前三阶自振频率，以降低鞭梢效应；风荷载作用下楼顶钢塔的风振响应远大于主体结构，随基本风压和钢塔高度的增大而增大，但随钢塔跨度的增大而减小；阻尼器可有效衰减楼顶钢塔的风振响应，粘滞阻尼器对楼顶钢塔风振响应的减振效果优于粘弹性阻尼器，而非线性粘滞阻尼器的减振效果又优于线性粘滞阻尼器。

Parameter influences on wind-induced Vibration of a high-rise building with steel tower protrusion

Wind-induced vibration responses of a high-rise building with steel tower protrusion were studied.An AR model was adopted to simulate fluctuating wind time-series.The dynamic characteristics of the main structure,the steel tower protrusion and the whole system of them with along wind direction were discussed.Influences of six parameters,such as,wind speed power spectrum,frequency ratio and basic wind pressure,etc.On the responses along wind direction were analyzed.Control effects of velocity-dependent dampe...