Seismic testing and numerical analysis of <scp>Y‐shaped</scp> eccentrically braced frame made of high‐strength steel

Lian, Ming; Su, Mingzhou

doi:10.1002/tal.1455

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…The controlling plastic mechanism of the dual system (stairs stringers and eccentrically braced frames) was checked in the pushover analysis to ensure the invariant kinematic response of the structure. [29,30] Recent articles studied the effects of the strength of steel in vertical links on the seismic behavior of the building. [31][32][33] Satisfactory results were obtained considering S355 steel for the seismic links.…”

Section: Plastic Hinge In Seismic Links (Ebf)mentioning

confidence: 99%

Special braced stairs versus typical braced frames. New architectural‐structural‐seismic approach to stair design

Turon

Alzate

2023

Structural Design Tall Build

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This paper presents a new approach to the project of steel buildings, mainly focused on the architectural, structural, and seismic design of stairs. The objective is to design a structural stair system capable of controlling seismic damage and contributing to the bracing system of the building. The article begins with a review of the seismic standard (ATC, FEMA, and EC8) on which the current design criteria for new buildings with stairs are based. The research is based on two spatial building models (A-B) with the same bracing elements but placed differently. Reference Model A follows classical design approaches. It means, stairs are considered nonstructural elements that do not influence the seismic behavior of the building. This structure corresponds to typical braced frames (IV-CBF and EBF) according to EC8. Model B includes a stair system designed to help control the effects of inter-story drifts and inertia forces. In this case, the same bracing elements of Model A were integrated into the stair structure of Model B. A comparative seismic behavior analysis of typically braced frames (A) versus specially braced stairs (B) is presented. The research was based on the static nonlinear (pushover) analysis and the capacity spectrum method (ATC-40) according to the seismic performance levels (FEMA) and damage limitation (EC8).Finally, the braced stairs was verified via nonlinear time-history analysis in order to better capture the structural safety of the evacuation routes and their influence on the behavior of the building. This deterministic analysis of the braced stairs verified satisfactory results compared to reference bracing systems.

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Section: Plastic Hinge In Seismic Links (Ebf)mentioning

confidence: 99%

Special braced stairs versus typical braced frames. New architectural‐structural‐seismic approach to stair design

Turon

Alzate

2023

Structural Design Tall Build

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“…중심가새골조의 내진성능향상을 위한 휨항복댐퍼의 개발 는데, 에너지 흡수 능력이 우수하지만 구성과 제작이 복잡하 고 제조 비용이 높은 것이 단점이다. 가새 요소에 직접 부착되 는 댐퍼는 구성과 제작이 간단해서 경제적이며, U자형강 (Taiyari et al, 2019), 비틀림 빔 (Lotfi Mahyari et al, 2019), 테 이퍼드 캔틸레버 (El-Sayed and El-Mongy, 2018), f 테이퍼 튜 브 댐퍼 (He and Chen, 2021), 전단 댐퍼 (Ghamari et al, 2019(Ghamari et al, , 2021) 등이 있다.…”

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Development of a Flexure Yielding Steel Damper for Concentrically Braced Frames

Jeong¹,

Ghamari²

2022

J. Comput. Struct. Eng. Inst. Korea

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This paper details the analytical and experimental studies performed to propose a steel damper based on the flexural yielding mechanism. The damper is composed of a set of damping plates that are designed to yield in flexure. The comparison of experimental and finite element analysis results indicate that the analytical approach adopted in this study should be appropriate to perform sensitivity studies on the geometries of the damping plates. Although the damper is originally proposed to work based on the flexural mechanism, it is observed that the contribution of the tensile behavior of the damping plate could be considerable. As the thickness of the damping plate increases, the plastic energy due to the flexural yield increases. As the thickness of the damping plate decreases, the contribution of the tensile behavior increases, and the shape of the hysteresis loop distorts.

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Experimentally and analytically study on eccentrically braced frame with vertical shear links

Vetr

Ghamari²

2019

Structural Design Tall Build

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The excellent hysteretic behavior of eccentrically braced frames (EBFs) using shear links have made these systems an effective alternative for both moment resisting frame as well as concentrically braced structures. Generally, horizontal shear links are located either at the middle or at the ends of the beam. However, large deformation of the shear links in those beam must be accepted under severe earthquakes. In those instance in which the beam have to remain elastic, vertical shear links should be designed underneath the beam thereby transferring the region of plastic deformation to location where they are tolerable and post-earthquake repair or replacement of damaged parts is easier. In this paper, seismic behavior of vertical-EBF (V-EBF) have been considered experimentally and analytically. The required relation to design of the system have been proposed. In addition, to predict nonlinear behavior of V-EBF systems, an analytical model including kinematic-isotropic strain hardening for shear, only kinematic strain hardening for moment, has been presented. Results showed a good convergence of the presented analytical model (with an upper bound for yielding surface to the V-EBF) with experimental results. KEYWORDS cyclic loading, ductility, dynamic response, experimental, shear yielding, strain hardening 1 | INTRODUCTION Eccentrically braced frames (EBFs) have been used as a seismic load resisting system, primarily in buildings. The system, which relies on the yielding of a horizontal link beam between eccentric braces, has been shown to provide ductility and energy dissipation under seismic loading, and its behavior in various configurations has been investigated. In other hand, the EBF systems are metallic passive energy dampers under seismic loading.Despite high seismic energy dissipation, horizontal-EBF (H-EBF) has substantial disadvantages. It is no simple replace or repair of link beam in the H-EBF after a severe earthquake. This problem is the main disadvantage of this system. In addition, in industrial structures such as power plants, deep beams are sometimes used to carry the loads of heavy and highly sensitive equipment. In these cases, to assure the efficiency and accuracy of the equipment, load-bearing members such as beams and columns should remain in the elastic range as much as possible. Therefore, the use of horizontal link beams is not convenient. To overcome the problems in the EBF system, a new system called the vertical-EBF (V-EBF) system was proposed. [1] In this system, reversed-V braces are attached to the story beam through a shear panel. Intensive inelastic deformations are localized in the shear panel, and the internal energy is dissipated by this member. Figure 1 shows plastic hinge formation in the EBFs and V-EBFs. Because all inelastic deformation is localized in the shear panel, there is no damage to the main members of the frame, and repairs after a strong earthquake are easier than in H-EBF systems because this member can be replaced. Using the vertical links for seismic rehabilit...

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Seismic testing and numerical analysis of Y‐shaped eccentrically braced frame made of high‐strength steel

Cited by 10 publications

References 17 publications

Special braced stairs versus typical braced frames. New architectural‐structural‐seismic approach to stair design

Special braced stairs versus typical braced frames. New architectural‐structural‐seismic approach to stair design

Development of a Flexure Yielding Steel Damper for Concentrically Braced Frames

Experimentally and analytically study on eccentrically braced frame with vertical shear links

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