Dynamic Response Evaluation of Damped-Outrigger Systems with Various Heights

Huang, Bin; Takeuchi, Tōru

doi:10.1193/051816eqs082m

Cited by 58 publications

(35 citation statements)

References 9 publications

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“…In addition, regardless the dampers size (damping coefficient), λ < 0.4 has less effect on improving the overall damping ratio of the building, if compared to values of λ > = 0.4. This observation is in agreement with the study of Huang and Takeuchi and suggests that an optimal location of the outrigger (λ OPT ) is somewhere between 0.4 and 0.9. It should be noticed, nevertheless, that the optimal damping varies with the mode, so no single outrigger location will lead to reduce the response of all the modes to its minimum .…”

Section: Parametric Study On the Factors Affecting The Performance Ofsupporting

confidence: 93%

“…Although it has been suggested that damping ratio may exert a larger influence on the structural performance, peak responses may not be optimally reduced by assuming a λ OPT based on the increase of the damping ratio. If, for a given earthquake level, the peak inter‐story drift at each of the selected range of outrigger locations λ is plotted, then the inter‐story drift is reduced as λ increases (Figure a).…”

Section: Parametric Study On the Factors Affecting The Performance Ofmentioning

confidence: 99%

“…Numerical and experimental studies have been conducted to extend these damper‐based control capabilities towards an improved reduction of the dynamic response, including seismic scenarios . However, few studies explore the performance of damped outriggers under strong earthquake motion.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers

Morales‐Beltran

Turan

Yıldırım

et al. 2018

Structural Design Tall Build

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The seismic design of optimal damped outrigger structures relies on the assumption that most of the input energy will be absorbed by the dampers, whilst the rest of the structure remains elastic. When subjected to strong earthquakes, nevertheless, the building structure may exhibit plastic hinges before the dampers begin to work. In order to determine to which extent the use of viscously damped outriggers would avoid damage, both the host structure's hysteretic behaviour and the dampers' performance need to be evaluated in parallel. This article provides a parametric study on the factors that influence the distribution of seismic energy in tall buildings equipped with damped outriggers: First, the influence of outrigger's location, damping coefficients, and rigidity ratios core-to-outrigger and core-to-column in the seismic performance of a 60-story building with conventional and with damped outriggers is studied. In parallel, nonlinear behaviour of the outrigger with and without viscous dampers is examined under small, moderate, strong, and severe long-period earthquakes to assess the hysteretic energy distribution through the core and outriggers. The results show that, as the ground motion becomes stronger, viscous dampers effectively reduce the potential of damage in the structure if compared to conventional outriggers. However, the use of dampers cannot entirely prevent damage under critical excitations. KEYWORDSdamped outrigger, energy distribution, hysteretic energy, strong earthquakes, tall buildings, viscous damper 1 | INTRODUCTION Outrigger systems consist of a series of cantilever truss beams or shear walls connecting the building core with the perimeter columns. As a result, the axial forces acting at the end of the outriggers help the reduction of the total deflection of tall buildings by increasing the restoring moment.Dampers have been introduced between the perimeter columns and the outriggers, resulting in an increase in the overall damping of the building, instead of an increase of static stiffness and strength. [1] A well-known first implementation of this system in twins' 60-story buildings is reported in Willford and Smith. [2] Park et al. [3] reported the installation of damped outriggers in a 68-story tower in South Korea. In a recent review, [4] Smith reported two more applications of damped outriggers in tall buildings. All the authors point out that the addition of supplementary damping systems not only reduced the overall vibration response, but also construction costs.Numerical and experimental studies have been conducted to extend these damper-based control capabilities towards an improved reduction of the dynamic response, [3,[5][6][7] including seismic scenarios. [8][9][10][11][12][13][14][15][16][17] However, few studies explore the performance of damped outriggers under strong earthquake motion. Generally, studies are based on the use of peak ground acceleration (PGA) values up to 0.4 g, whereas strong earthquakes may exhibit PGAs of about 1.0 g. At the same time, most of the resea...

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Section: Parametric Study On the Factors Affecting The Performance Ofsupporting

confidence: 93%

Section: Parametric Study On the Factors Affecting The Performance Ofmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers

Morales‐Beltran

Turan

Yıldırım

et al. 2018

Structural Design Tall Build

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“…The performance of a damped‐outrigger in reducing the seismic response was also verified experimentally . Huang and Takeuchi indicated that the optimal elevation of a damped‐outrigger incorporating viscous dampers ranges from 50% to 80% of the building height. In addition, the seismic performance of multioutrigger was also investigated .…”

Section: Introductionmentioning

confidence: 99%

Seismic performance evaluation of single damped‐outrigger system incorporating buckling‐restrained braces

Lin

Takeuchi

Matsui

2018

Earthq Engng Struct Dyn

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Summary The outrigger system is an effective means of controlling the seismic response of core‐tube type tall buildings by mobilizing the axial stiffness of the perimeter columns. This study investigates the damped‐outrigger, incorporating the buckling‐restrained brace (BRB) as energy dissipation device (BRB‐outrigger system). The building's seismic responses are expected to be effectively reduced because of the high BRB elastic stiffness during minor earthquakes and through the stable energy dissipation mechanism of the BRB during large earthquakes. The seismic behavior of the BRB‐outrigger system was investigated by performing a spectral analysis considering the equivalent damping to incorporate the effects of BRB inelastic deformation. Nonlinear response history analyses were performed to verify the spectral analysis results. The analytical models with building heights of 64, 128, and 256 m were utilized to investigate the optimal outrigger elevation and the relationships between the outrigger truss flexural stiffness, BRB axial stiffness, and perimeter column axial stiffness to achieve the minimum roof drift and acceleration responses. The method of determining the BRB yield deformation and its effect on overall seismic performance were also investigated. The study concludes with a design recommendation for the single BRB‐outrigger system.

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“…On the basis of this experimental study, Zhou and Li performed further analyses to evaluate the dynamic response of two finite element (FE) models, representing the tested specimens, under various earthquake records. Huang and Takeuchi developed analytical methods to determine the optimal outrigger locations and damper sizes to minimize response and constructed a simplified single‐degree‐of‐freedom model. The experimental and analytical research on damped outriggers comprises not only the use of VDs as energy dissipation devices but also the use of buckling‐restrained braces (BRBs).…”

Section: Introductionmentioning

confidence: 99%

Optimal vertical configuration of combined energy dissipation outriggers

Xing

Zhou

Aguaguiña

2018

Structural Design Tall Build

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The damped outrigger system emerged as an improvement of the conventional outriggers with the aim to provide supplemental damping and to contribute to the vibration control in super tall buildings where this system is usually applied. In addition to viscous dampers (VDs), buckling-restrained braces (BRBs) have also been employed as energy dissipating members in outriggers. Nevertheless, the combined use of outriggers with VDs and BRBs in the same structure has not yet been studied. Such combination can contribute to achieve an effective multiperformance design of super tall buildings. This paper presents a study whose main objective was to determine the optimal vertical combination of two types of energy dissipation outriggers to control the seismic responses of a 9-zone super tall model structure. Outriggers with VDs (OVDs) and outriggers with BRBs (OBRBs) were placed at the different zones of the structure considering all the possible combinations and in configurations of up to four outriggers. The effects of these combinations on the seismic performance of the structure were studied through parametric analysis and optimization methods. This form of the outrigger system is defined in this paper as combined energy dissipation outrigger system. The results indicate that when two energy dissipation outriggers are used, the combination of OBRB plus OVD shows superior seismic performance compared with other double-outrigger configurations. In addition, the results show that the locations of OVDs and OBRBs play an important role in the structure behavior; it was found that it is more beneficial to place OBRBs above OVDs.

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Dynamic Response Evaluation of Damped-Outrigger Systems with Various Heights

Cited by 58 publications

References 9 publications

Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers

Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers

Seismic performance evaluation of single damped‐outrigger system incorporating buckling‐restrained braces

Optimal vertical configuration of combined energy dissipation outriggers

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