Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings

Kim, Dong-Wook; Jeon, Chiho; Shim, Chang-Su

doi:10.12989/scs.2016.20.6.1221

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…BRBs possess characteristics of both conventional braces and hysteretic dampers: provide lateral structural stiffness under frequent earthquakes and dissipate seismic energy by metallic yielding under extreme earthquakes . It has been widely applied in buildings, bridges, and developing new structural systems because of its stable hysteretic performance and excellent low‐cycle fatigue behavior.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on buckling‐restrained braces using mortar‐filled steel tubes with steel lining channels

Yuan

Wang

et al. 2019

Structural Design Tall Build

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A new type of buckling-restrained braces (BRBs) using mortar-filled steel tubes with steel lining channels is proposed to reduce the frictional force between the core member and the restraining member. After covering the core plate with the unbonding material, steel lining channels are set on the surface along the longitudinal direction, thus transforming the contact property between the core plate and the restraining member from steel-mortar interface to steel-steel interface. First, comparative cyclic tests are conducted on two new BRBs with steel lining channels and one conventional BRB. All the specimens exhibit stable hysteretic performance without visible global or local instability prior to failure. It is confirmed that the steel lining channels can improve the interface evenness between the core plate and the restraining member, reduce the compression strength adjustment factor, and improve the low-cycle fatigue behavior and energy dissipation capacity of the BRB. Furthermore, the analytical model for the local stability of the restraining tube is proposed when the core plate buckles about the strong axis, and the corresponding practical design criteria are provided. The influence of various core plate layouts on the local stability of the restraining tube is finally investigated. K E Y W O R D Sbuckling-restrained brace, local stability, low-cycle fatigue, mortar-filled tubes, steel lining channels | INTRODUCTIONBuckling-restrained brace (BRB), acting as an effective metallic yielding hysteretic damper, is mainly composed of the core member and the restraining member. The core member bears axial forces, while the restraining member serves as the lateral support and prevents the brace from global and local buckling. BRBs possess characteristics of both conventional braces and hysteretic dampers: provide lateral structural stiffness under frequent earthquakes and dissipate seismic energy by metallic yielding under extreme earthquakes. [1] It has been widely applied in buildings, [2][3][4][5][6] bridges, [7,8] and developing new structural systems [9] because of its stable hysteretic performance and excellent low-cycle fatigue behavior.According to the contact property between the core member and the restraining member, BRB can be typically classified into BRB with mortar-filled steel tubes [10] and BRB with all-steel restraining component, [11][12][13][14] as illustrated in Figure 1. In the former category, core buckling is inhibited by a hollow steel tube filled with concrete or mortar, leading to the steel-mortar interface. In the latter category, the core member is sandwiched by steel plates or steel sections with bolts or welds, and the contact property is steel-steel interface.Compared with all-steel restraining component, the mortar-filled steel tube shows better adaptability for the core member with various cross sections. In addition, the cost-effectiveness of the infill mortar also contributes to the widespread practical application of the BRB with mortar-

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Section: Introductionmentioning

confidence: 99%