摘要
根据超高层建筑横风向风振响应的特点,提出了超高层建筑横风向风振计算的响应谱法,相对于传统计算方法,响应谱法具有以下特点:(1)响应谱法基于横风向风荷载沿建筑高度分布的特征及随机振动理论分析计算结构响应,该方法直接对分析结果进行数据拟合,相比于传统方法只拟合建筑风荷载基底合力均方值及功率谱密度函数的特点,该方法减少了计算中间过程,减小了计算误差。(2)采用响应谱方法计算结构响应时,可以考虑多阶振型的贡献。(3)响应因子本质上是反映结构振动对准静态风荷载放大作用的响应谱,在应用上与地震作用计算方法类似,便于工程人员理解和应用。由于公式简单、易于理解,响应谱法具有较好的操作性,可为超高层建筑横风向抗风设计提供参考。
The response spectrum method of across-wind response calculation is proposed based on the characteristics of across-wind induced responses of super high rise buildings. Compared with the traditional calculation method, response spectrum method has the following features:(1) Calculated response is based on the characteristics of across wind load distribution along the height of the building and the random vibration theory. The used date is the final results rather than root mean square value and power spectrum of the base shear force or overturning moment in traditional method, so the calculation process is simplified and the calculation error is decreased.(2) Multi-order mode contribution is considered in the response calculation.(3) Similar to seismic action calculation, the response factor is in fact a spectrum which reflects the amplification effect of the quasi-static effects, so it is easy to be understood and used in engineering. Due to its simple expression and good application, the proposed method can provide reference for the wind-resistant design of high-rise building crosswind.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第S1期82-87,共6页
China Civil Engineering Journal
基金
国家"十二五"科技支撑计划项目资助(2012BAJ07B01)
关键词
风振响应
位移响应谱
加速度响应谱
横风向
响应因子
wind-induced response
displacement response spectrum
acceleration response spectrum
across-wind
response factor
