摘要
对SSI与刚接两种条件下四层钢管混凝土框架结构体系进行了模态分析与模型验证,并在此基础上对4层、8层、12层3种不同高度楼层的钢管混凝土框架结构体系进行了非线性地震响应分析。通过模态试验分析,获得考虑SSI影响后会使结构体系自振频率减小,周期增大,并在高阶模态会出现提离现象。选取了3组地震动对3种不同楼层高度的结构进行非线性地震响应时程分析,获得考虑SSI作用未必均会使结构体系的地震反应放大,其具体情况应视结构的自振周期与地震波的主要特征频率的关系。SSI对钢管混凝土框架结构的地震响应有一定的影响,在抗震设计中应该进行适当考虑。
In this paper,modal analysis and model verification of four-story concrete-filled steel tube frame system are carried out under SSI and rigid connection conditions.Based on this,the nonlinear seismic response analysis of concrete-filled steel tube frame system at three different levels of floors 4,8 and 12 is carried out.Through modal analysis,obtain the natural frequency of the system will be reduced and period increased under the SSI impact condition,and the lift-off phenomenon will appear in the high-order mode.Three groups of earthquakes are selected to analyze the time-history of nonlinear seismic responses of three different storey structures.Obtain the structural system consideration of SSI may not necessarily amplify the seismic response,the specific situation should be depending on the structure of the natural vibration cycle and the relationship between the main characteristics of seismic frequency.The SSI has a certain influence on the seismic response of concrete-filled steel tube frame structure,and should be properly considered in the seismic design.
作者
陈强
CHEN Qiang(Fujian jinyi construction engineering limited company,Fuzhou 350001)
出处
《福建建筑》
2018年第2期65-69,共5页
Fujian Architecture & Construction
关键词
土-结构相互作用
框架结构
钢管混凝土
地震响应
Soil-structure interaction
Framework
Concrete-filled steel tube
Earthquake response
