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http://dx.doi.org/10.12989/sem.2022.81.6.715

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)
Publication Information
Structural Engineering and Mechanics / v.81, no.6, 2022 , pp. 715-728 More about this Journal
Abstract
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.
Keywords
buckling-restrained brace; component test; design recommendation; longitudinally profiled steel core; low-cycle fatigue;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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