文献类型：期刊文献

英文题名：Theoretical analysis and experimental investigation of hysteretic performance of self-centering variable friction damper braces

作者：Wang, Yongwei Zhou, Zhen Xie, Qin Huang, Linjie

第一作者：Wang, Yongwei

通信作者：Zhou, Z[1]

机构：[1]Southeast Univ, Key Lab Concrete & Prestressed Concrete Struct, Minist Educ, Nanjing 210096, Peoples R China;[2]Guizhou Inst Technol, Sch Civil Engn, Guiyang 550003, Peoples R China

第一机构：Southeast Univ, Key Lab Concrete & Prestressed Concrete Struct, Minist Educ, Nanjing 210096, Peoples R China

通信机构：corresponding author), Southeast Univ, Key Lab Concrete & Prestressed Concrete Struct, Minist Educ, Nanjing 210096, Peoples R China.

年份：2020

卷号：217

外文期刊名：ENGINEERING STRUCTURES

收录：;EI(收录号：20202208719423);Scopus(收录号：2-s2.0-85085248279);WOS:【SCI-EXPANDED(收录号:WOS:000539278700007)】；

基金：The authors would like to acknowledge financial supports from "National Key Research and Development Program of China" (2018YFC0705700), "National Natural Science Foundation of China" (51878150), "Postgraduate Research & Practice Innovation Program of Jiangsu Province" (KYCX18_0118). These supports are gratefully acknowledged.

语种：英文

外文关键词：Self-centering; Variable friction damper; Hysteretic performance; Energy dissipation; Basalt-fiber-reinforced polymer (BFRP)

摘要：Traditional buildings, even with normal self-centering energy dissipation (SCED) braces, might suffer from large deformations and high mode effects under an extremely strong earthquake, leading to a concentration of inter-story drift in upper floors. To satisfy the requirements of resilience, larger post-yield stiffness and higher energy dissipation, a novel brace with pretensioned basalt fiber-reinforced polymer (BFRP) tendons and variable friction dampers (VFDs) was developed, and this brace was termed the self-centering variable friction damper (SC-VFD) brace. The variable stiffness and sliding force of the VFD system were theoretically analyzed. This was followed by quasi-static experiments on two VFD and two SC-VFD braces with different parameters. The theoretical analysis and experimental results revealed the same tendencies, demonstrating the reliability and feasibility of SC-VFD braces. The hysteretic curve of the SC-VFD braces exhibited stable and normal flag-shape behavior before the second activation, while the hysteresis curve indicated a variable flag-shape behavior with second activation, variable friction force, and larger post-yield stiffness when the brace slid at slope section. Compared with the VFD brace, the SC-VFD brace had the same energy dissipation ability but less residual displacement and lower equivalent viscous damping ratio. More combinations of disc springs in series resulted in smaller axial forces and lowers post-yielding stiffness, thereby decreasing the energy dissipation capability.