摘要
采用脉动法对两栋钢框架结构房屋的动力特性进行了现场实测，通过实测结果和有限元计算结果的比较，研究了楼板和填充墙对钢结构纯框架结构动力特性的影响。试验及分析结果表明，多层钢结构纯框架房屋的振型为剪切型；阻尼比在2％～5％之间；填充墙明显缩短了钢结构纯框架的自振周期，使得实测周期小于计算周期，抗震计算时应对计算周期进行折减。给出的周期折减系数可供工程设计参考。
Field measurements of dynamic properties of two steel frame buildings were carried out, including natural vibration periods, modes and damping ratios, by using the ambient vibration test technique. The comparisons between measured dynamic properties and calculated dynamic properties are made to study the influence of factors such as reinforced concrete slabs and infilled walls. Results show that the damping ratio of the steel frame multi-story building is between 2% and 5%, and the vibration period is shortened mainly by in filled walls. Advice on the period shortening factor for seismic design is given.
出处
《建筑科学》
北大核心
2007年第5期37-40,58,共5页
Building Science
关键词
动力特性
实测
脉动法
周期折减系数
dynamic properties
field measurements
ambient vibration test
period shortening factor
