摘要
为评估高层建筑风振的舒适度,应建立简单实用的结构风振响应计算方法。而我国GB 50009—2012《建筑结构荷载规范》的高层建筑顺风向风振响应简化计算方法没有考虑二阶振型的贡献。基于准定常理论,采用频域法进行了考虑二阶振型贡献的高层建筑顺风向风致响应评估,并分析了二阶振型对结构风致响应的贡献。结果表明：二阶振型对高层建筑顺风向动力位移响应的贡献一般在2%以内,但对顺风向动力加速度响应的贡献最大能达到18%。在评估结构顺风向风振加速度响应时,二阶振型的贡献不能忽略。在此基础上,推导了考虑二阶振型的对称等截面高层建筑顺风向风振响应简化计算方法。将此简化方法得到的结果与频域法和规范公式得到的结果进行对比,其误差在5%以内,表明简化公式具有较好的精度和适用性。
In order to evaluate the wind-induced comfort level of tall buildings, a simple and practical method should be established for calculating wind-induced dynamic responses of structures. However, the contribution of the second order mode to the along-wind responses of tall buildings are neglected in the simplified calculation method in GB 50009-2012 ＇Load code for the design of building structures＇. Based on a quasi-steady theory, the wind-induced responses of tall buildings considering the contribution of the second order mode were evaluated based on a frequency domain method, and the contribution of the second order mode to the along-wind dynamic responses was analyzed. The results show that： the contribution of the second order mode to the along-wind dynamic displacement responses of tall buildings is generally less than 2%, while the contribution to the dynamic acceleration response can be up to 18%. The contribution of the second order mode cannot be neglected when evaluating the wind-induced acceleration responses of structures. Based on the study, a simplified method for calculating the along-wind wind-induced dynamic responses of tall buildings with symmetrical uniform section is derived, and the first two modes are taken into account. By comparison of the results obtained by this simplified method with those obtained by the frequency domain method as well as the formulae in Chinese codes, it is found that the error is less than 5%, which shows that the simplified formulae have good accuracy and applicability.
作者
邹良浩
施天翼
梁枢果
宋杰
李峰
ZOU Lianghao;SHI Tianyi;LIANG Shuguo;SONG Jie;LI Feng(School of Civil Engineering,Wuhan University,Wuhan 430072,Chin)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第8期18-25,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51478369)
关键词
高层建筑
风振响应
二阶振型
简化计算
high-rise building
dynamic response
second mode
simplified calculation
