Cyclic testing and performance evaluation of buckling-restrained knee-braced frames

Junda, Eknara; Leelataviwat, Sutat; Doung, Piseth

doi:10.1016/j.jcsr.2018.05.012

Cited by 33 publications

(29 citation statements)

References 11 publications

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“…Instead, the moment frame of sixth tier in the bunker bay is strengthened by using stocky knee braces, as presented in Figure b. The effectiveness of the knee‐braced system has been investigated by means of physical tests and numerical analyses. Using the design method provided by Leelataviwat et al yielding and buckling damage initially occur at the knee braces and then followed by plastic hinging formation in the connected moment frame.…”

Section: Structural Retrofit Designsmentioning

confidence: 99%

Seismic retrofit design and risk assessment of an irregular thermal power plant building

Wang

Dai

et al. 2020

Structural Design Tall Build

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Summary Electric power system is one of essential lifeline systems for an urban community. An actual power plant building with typical coal‐fired power generation process is selected to be studied in this paper. The detrimental impacts on the seismic performance of the structural system induced by heavy coal bunkers and irregular bracing configurations are expected to be mitigated by using retrofit strategies. A total of three retrofit design schemes that employ the isolation and supplemental damping techniques are developed. The original design scheme of the actual thermal power plant building that adopts steel special concentrically braced frame as lateral‐force resisting system is used as benchmark for comparison purposes. Nonlinear response‐history analyses are performed, and the obtained seismic responses are compared. To better quantify the benefit of the considered retrofit strategies, seismic risk in terms of probabilities of exceeding designated damage states as well as the downtime are analyzed. For the studied thermal power plant building, the results show that the added damping system is more effective in seismic risk reduction than the isolation for heavy coal bunkers. Compared to the original structural system design, the use of supplemental damping system cut the downtime of the thermal power plant building at most 42%.

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Section: Structural Retrofit Designsmentioning

confidence: 99%

Seismic retrofit design and risk assessment of an irregular thermal power plant building

Wang

Dai

et al. 2020

Structural Design Tall Build

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“…Recently, Junda et al (2018) presented an efficient structural steel system called bucklingrestrained knee-braced frame (BRKBF) as shown in Figure 1.8. The advantages of a BRKBF include relatively simple connections, reparability after an earthquake, and fewer obstructions than conventional bracing systems.…”

Section: Buckling Restrained Knee Braced Framementioning

confidence: 99%

“…Buckling Restrained Knee Braced Frame System(Junda et al 2018) 1.4 Dual Fused H-Frame System DescriptionMost of the fused SFRSs mentioned in section 1.3 do not take construction efficiency into considerations. To address this issue, a novel resilient fused SFRS namely Dual-Fused H-Frame (DFHF) is proposed in this thesis.…”

mentioning

confidence: 99%

Seismic Design and Performance Evaluation of Dual-Fused H-Frame System

Etebarian

Tung

2019

J. Struct. Eng.

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A Dual-Fused H-Frame (DFHF) is an efficient structural system that combines Damped H-Frame (DHF) modules with Welded Wide Flange Fuses (WWFFs) to create a structural solution which is efficient in construction and more seismic resilient. Each DHF module consists of two columns pin connected to a beam with two buckling restrained knee braces (BRKBs). Each DHF module can be prefabricated in the factory, shipped to the site and connected vertically using simple bolt connections. The connections between the DHF modules have relatively small moment demand which makes the design, fabrication and construction of the DHF modules very efficient. Once the DHF modules have been assembled vertically, the bays of the DHF can be connected using WWFFs. WWFFs are simple shear connectors which can dissipate stable earthquake energy. In this paper, two prototype DFHF buildings of varying heights (3-and 9-story) are designed using the Equivalent Energy Design Procedure (EEDP). EEDP is a novel design method which is developed to design innovative systems, where the structural system can achieve different performance objectives under different earthquake shaking intensities. To verify the performance of the DFHF, advanced finite element models are developed using OpenSees and subjected to an extensive array of time history analyses. The results show that the proposed EEDP designed DFHF can achieve the targeted performance objectives under different seismic shaking intensities. In addition, DFHF has sufficient margin of safety against collapse. Hence the proposed DFHF can be used as an efficient structural system in high seismic zone iv Lay Summary Recent earthquakes have caused significant damages into structures. These damages lead to loss of functionality and result in prolonged downtime. To address this issue, an innovative seismic force resisting system (SFRS) called Dual-Fused H-Frame (DFHF) is proposed in this thesis. DFHF employs two types of specially designed structural fuses to sacrifice during a seismic event while protecting the main structural members. These structural fuses can be quickly inspected, repaired, or replaced if needed after a strong earthquake shaking. Two prototype DFHF buildings of varying heights (3-and 9-story) are designed and analyzed numerically using past earthquake records. The results show that the proposed DFHF has acceptable seismic performance and has sufficient margin of seismic safety against collapse. Hence, it can be used as an effective SFRS in high seismic regions. v Preface This thesis is the original, independent work of Hamidreza Etebarian. The author was responsible for the literature review, model development, computational analysis, data processing, and results presentation. The author has drafted this thesis and revised it based on the comments by Prof. Tony Yang. It should be noted that this thesis is summarized into a peer-reviewed journal paper which is currently under review. vi

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“…Yang et al 15 carried out an analytical study to identify an optimal angle of BRB in BRKB-TMF while minimizing initial construction cost and post-hazard repair cost, and Yang et al 16 illustrated the superior performance of BRKB-TMFs in comparison to long-span steel MFs as seismic force-resisting systems. Along with the application on design of BRKB-TMFs, the PBPD concepts have also been applied to the design of reinforced concrete-BRBFs, 17,18 steel-BRBFs, 19 steel-BRKB frames, 20 among others.…”

Section: Introductionmentioning

confidence: 99%

Experimental testing of aluminum‐core buckling restrained knee braced Truss moment frames for earthquake resistance

Chhabra

Durgesh

2022

Earthq Engng Struct Dyn

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Application of Buckling Restrained Braces (BRBs) with Truss Moment Frames (TMFs) results in a robust seismic force‐resisting system, herein referred to as Buckling Restrained Knee Braced Truss Moment Frame (BRKB‐TMF), which utilizes the advantages of both BRBs and TMFs. Although steel is commonly used to make the core of BRBs, previous studies have demonstrated the efficacy of annealed aluminum as a preferred core material because of its high ductility and high over‐strength. However, the deformation compatibility of the truss members with the aluminum‐core BRB in BRKB‐TMFs at high drifts is not well studied in the literature. Hence, an experimental study is performed on a scaled sub‐assemblage of a BRKB‐TMF frame designed using the Performance‐Based Plastic Design method. Cyclic tests are performed on 1:3 scale models of aluminum‐core BRB and BRKB‐TMF to evaluate their performance at drifts corresponding to Maximum Considered Earthquake intensity. Also, to further compare the performance of steel and aluminum as suitable BRB core materials, cyclic tests are performed on BRBs with steel and aluminum cores designed using a consistent criterion. The experiments demonstrated the superior performance of aluminum core BRB over steel core BRB. The experimental studies on the BRKB‐TMF concluded that per the design intent, the BRB acted like a fuse for the frame by restricting all the inelastic deformations to itself and the study frame could successfully meet the target drift criteria.

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Cyclic testing and performance evaluation of buckling-restrained knee-braced frames

Cited by 33 publications

References 11 publications

Seismic retrofit design and risk assessment of an irregular thermal power plant building

Seismic retrofit design and risk assessment of an irregular thermal power plant building

Seismic Design and Performance Evaluation of Dual-Fused H-Frame System

Experimental testing of aluminum‐core buckling restrained knee braced Truss moment frames for earthquake resistance

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