Seismic performance of buckling‐restrained brace outrigger system in various configurations

Lin, Po-Chuan; Takeuchi, Tōru

doi:10.1002/2475-8876.12120

Cited by 12 publications

(7 citation statements)

References 10 publications

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“…As shown in Figure 10b1–b3,d1–d2, the modal damping ratios increase with the depth of the slit, while an optimal value exists for the total dissipater amount. According to the complex eigenvalue analysis results in the author's previous study, [ 9,21–23 ] the damped outrigger system was found to be the most effective in increasing only the first‐order mode damping ratio. Compared to this result, it is a noteworthy advantage of the damped braced tube system with the damping ratios of the second and third modes higher than 7%.…”

Section: Seismic Performance Of Damped Brace Tube System Incorporatin...mentioning

confidence: 99%

A novel damped braced tube system for tall buildings in high seismic zones

ISHIBASHI

Terazawa

TANAKA

et al. 2022

Structural Design Tall Build

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The damped outrigger system is known to efficiently provide additional damping in buildings with heights of over 250 m. However, particularly for supertall buildings in the center of Tokyo, Japan, the outrigger truss from the center core to the exterior columns need to span distances of more than 20 m. This increases the flexural stiffness demand on the outrigger that leads to larger truss depths making the damped outrigger system inefficient. For such tall buildings with large plans, a new damping modification system, the "damped braced tube system" is proposed, where the exterior surface of the elastic mega braces are partially removed vertically to create a split and are replaced with dissipaters (energy-dissipation devices). The damped braced tube system enhances the seismic performance as the exterior surfaces of the elastic mega braces work together with the damped slits like in a coupled wall system and increases the overall damping ratio. In this paper, numerical models were constructed based on a real project in Japan consisting of a 397-m supertall building employing the damped tubular braced system using oil dampers (referred to as viscous dissipaters). A series of generalized response spectrum based numerical analyses and optimizations were performed to minimize the seismic response. The proposed system exhibited improved damping performance with the first to third mode damping ratios reaching to more than 7% while providing a wide range of options for dissipater distribution for design. Finally, the elevation of the slit's base is recommended to be equal to 0.22 of the total building height considering the trade-off relationship between the first modal damping ratio and the fundamental period.

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Section: Seismic Performance Of Damped Brace Tube System Incorporatin...mentioning

confidence: 99%

A novel damped braced tube system for tall buildings in high seismic zones

ISHIBASHI

Terazawa

TANAKA

et al. 2022

Structural Design Tall Build

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“…The results indicate that the location of an outrigger is more significant than its rigidity. Lin and Takeuchi [20] investigated the seismic behavior of structures with a single layer bucklingrestrained brace-outrigger. They proposed three types of buckling-restrained brace-outrigger configurations for practical design purposes that fit different architectural requirements.…”

Section: Literature Reviewmentioning

confidence: 99%

Effectiveness of outrigger and belt truss systems on the seismic behavior of high-rise buildings

Dedeoğlu¹,

Calayır²

2020

JSEAM

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The outrigger systems, which is widely used with shear wall-framed systems at the tall buildings, increase the lateral stiffness of the structural bearing system and reduce the lateral drift of the structure under lateral loads. However, the traditional outrigger systems, besides these positive contributions, also create some limitations and problems affecting the modeling of the structure. Some of these; more interior space occupying as an architect, problems arising in the connection of outrigger and center core (especially when a concrete shear-wall core is used). On the other hand, the belt trusses known as "Virtual Outriggers" which have recently been used to build high-rise structures, have removed these problems. Unlike the traditional outrigger systems, belt trusses are formed between the outer columns. In this way belt trusses eliminate the problems arising from the direct connection of the outriggers to the center core and other problems associated with using outriggers. Extensive studies have been carried out on the examination of outrigger and belt truss systems used in high-rise buildings under static and dynamic loads. In this study, the linear earthquake responses of three structural models, which are shear wall-framed system, shear wall-framed system with traditional outriggers and shear wall-framed system with belt trusses, were performed by using modal time history analysis method. Lateral displacements and drifts of the structure, internal forces of the structural elements were obtained. These results of three structural models were compared with each other and the effectiveness of outrigger and belt truss systems were assessed. For earthquake input, three real earthquake records were selected. These records were scaled in accordance with the DD2 level earthquake design spectrum defined in Turkish Building Earthquake Standards (2018) and used in the analyses.

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“…They investigated the seismic behavior of structures with a single layer BRB‐outrigger and proposed three types of BRB‐outrigger configurations for practical design purposes. [ 6 ] Du et al investigated the mix application of viscous dampers and BRBs by proposing a model with an additional damping ratio on the basis of developing a viscous damper priority placement analysis method. [ 7 ]…”

Section: Introductionmentioning

confidence: 99%

Optimal design of 3D special steel buckling‐restrained braced structures

Kaveh

Moghanni

Javadi

2021

Structural Design Tall Build

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Summary In the current study, the optimal design of 3D frames equipped with buckling restrained braces is presented. The objective function in the optimization problem is considered as weight minimization subjected to serviceability and strength requirements. Three different metaheuristic algorithms including Particle Swarm Optimization (PSO) algorithm, Teaching Learning Based Optimization (TLBO) algorithm, and Discrete Firefly Algorithm (DFA) are utalized to solve the optimization problem. Response spectrum analysis is considered to examine the performance of the structures during the optimization process under applied loads. Two real‐size steel structures with buckling restrained braces are selected to perform optimal design. The results demonstrate that the TLBO algorithm has better performance in discrete structural optimization.

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Seismic performance of buckling‐restrained brace outrigger system in various configurations

Cited by 12 publications

References 10 publications

A novel damped braced tube system for tall buildings in high seismic zones

A novel damped braced tube system for tall buildings in high seismic zones

Effectiveness of outrigger and belt truss systems on the seismic behavior of high-rise buildings

Optimal design of 3D special steel buckling‐restrained braced structures

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