Structural Engineering and Mechanics

  • 제81권6호
  • /
  • Pages.715-728
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  • 2022
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Experimental study of buckling-restrained brace with longitudinally profiled steel core

  • Lu, Junkai (School of Civil Engineering, Northeast Forestry University) ;
  • Ding, Yong (Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology) ;
  • Wu, Bin (School of Civil Engineering and Architecture, Wuhan University of Technology) ;
  • Li, Yingying (Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology) ;
  • Zhang, Jiaxin (Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology)
  • 투고 : 2021.01.11
  • 심사 : 2021.12.29
  • 발행 : 2022.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

A new type of buckling-restrained braces (BRBs) with a longitudinally profiled steel plate working as the core (LPBRB) is proposed and experimentally investigated. Different from conventional BRBs with a constant thickness core, both stiffness and strength of the longitudinally profiled steel core along its longitudinal direction can change through itself variable thickness, thus the construction of LPBRB saves material and reduces the processing cost. Four full-scale component tests were conducted under quasi-static cyclic loading to evaluate the seismic performance of LPBRB. Three stiffening methods were used to improve the fatigue performance of LPBRBs, which were bolt-assembled T-shaped stiffening ribs, partly-welded stiffening ribs and stiffening segment without rib. The experimental results showed LPBRB specimens displayed stable hysteretic behavior and satisfactory seismic property. There was no instability or rupture until the axial ductility ratio achieved 11.0. Failure modes included the out-of-plane buckling of the stiffening part outside the restraining member and core plate fatigue fracture around the longitudinally profiled segment. The effect of the stiffening methods on the fatigue performance is discussed. The critical buckling load of longitudinally profiled segment is derived using Euler theory. The local bulging behavior of the outer steel tube is analyzed with an equivalent beam model. The design recommendations for LPBRB are presented finally.

키워드

과제정보

The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (Grant No. 51908108) and Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2020D04). The work was also supported by the Hebei Provincial Transport Bureau Research Program TH-201902 and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education (Harbin Institute of Technology) with Grant No. HITCE201609.

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