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Steel and Composite Structures
  Volume 34, Number 1, January10 2020, pages 53-73
DOI: http://dx.doi.org/10.12989/scs.2020.34.1.053
 


Development of miniature bar-type structural fuses with cold formed bolted connections
Dongzhi Guan, Sen Yang, Liang-Jiu Jia and Zhengxing Guo

 
Abstract
    A novel all-steel miniature bar-type structural fuse (MBSF) with cold formed bolted connections is developed in this study, which consists of a central energy dissipation core cut from a smooth round bar, an external confining tube and nuts. Three types of cross sections for the central energy dissipation core, i.e., triple-cut, double-cut and single-cut cross sections, were studied. Totally 18 specimens were axially tested under either symmetric or asymmetric cyclic loading histories, where the parameters such as cut cross sectional area ratio, length of the yielding portion and cross sectional type were investigated. Numerical simulation of 2 representative specimens were also conducted. An analytical model to evaluate the bending failure at the elastic portion was proposed, and a design method to avoid this failure mode was also presented. The experimental results show that the proposed MBSFs exhibit satisfactory hysteretic performance under both the two cyclic loading histories. Average strain values of 8% and 4% are found to be respectively suitable for designing the new MBSFs as the ultimate strain under the symmetric and asymmetric cyclic loadings.
 
Key Words
    structural fuses; quasi-triangular cross section; seismic performance; cyclic loading; steel
 
Address
Dongzhi Guan and Zhengxing Guo: School of Civil Engineering, Southeast University, Nanjing 211189, China;
Key Laboratory of Concrete and Pre-Stressed Concrete Structures of the Ministry of Education, Nanjing 211189, China
Sen Yang: Key Laboratory of Concrete and Pre-Stressed Concrete Structures of the Ministry of Education, Nanjing 211189, China
Liang-Jiu Jia: Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China
 

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