摘要
为了进一步了解土体对其上部结构动力特性的影响,对土体采用弹簧-阻尼单元进行模拟,建立一个四层圆钢管混凝土框架结构在考虑土-结构相互作用(SSI)的有限元分析模型。为了比较,建立了相同结构底部刚接的结构体系模型。对两种结构体系的动力特性参数进行了分析比较,发现考虑SSI影响的结构自振频率比底部刚接的自振频率要小,降低的幅度在7.64%～13.06%之间;高阶振型变化明显。研究表明,SSI对钢管混凝土框架的动力特性有一定的影响,在其抗震设计和结构损伤检测方面应该进行适当地考虑。
In order to find out the effect of soil-mass on its upper structure, the spring-damper unit is employed to simulate the soil-mass, and then a finite element model of four-story concrete-filled steel tubular （CFST） frame considering SSI is built. For the purpose of comparison, a finite element model of the same upper structure with fixed-base system is also built. The dynamic parameters of both structural systems are analyzed and compared. The results show that the natural frequencies of structural system considering SSI are less than those of the fixed base system, and the decrements range from 7.64% to 13.06%; furthermore, the higher mode shapes change apparently. The results indicate that the SSI has effects on the dynamic characteristics of CFST structures to some extent and should be taken into account properly in the structural seismic design and structural damage detection.
出处
《华中科技大学学报（城市科学版）》
CAS
2008年第3期27-30,共4页
Journal of Huazhong University of Science and Technology
基金
辽宁省优秀人才支持计划(RC-05-16)
辽宁省重点实验室基金(JG-200604)
教育部重点项目(208064)
福建省教育厅重点项目(JA07002)
福州大学引进人才计划(826229)
关键词
土-结构相互作用
钢管混凝土
模态分析
有限元分析
soil-structure interaction
concrete-filled steel tubular
modal analysis
finite element analysis
