The Evolution of Outrigger System in Tall Buildings

Ho, Goman

doi:10.21022/ijhrb.2016.5.1.21

Cited by 32 publications

(16 citation statements)

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“…[16] A shaking table test of a single degree of freedom model done by Fallahi et al [17] showed that the responses of the model under resonant ground motions with 10% less peak ground acceleration (PGA) were about 60% larger than those under counterpart ordinary ground motions. On the other hand, in 2008 Great Wenchuan Earthquake, Wenchuan County was subjected to a seismic intensity of 10 to 11, [18] the PGA of which was [8][9][10][11][12][13][14][15][16] times of that of seismic intensity 7 specified in China Code for Seismic Design of Buildings (GB 50011-2001). [19] Unexpected extreme earthquakes are expected to be more likely to activate resonant ground motions.…”

Section: For Example the Collapse Of Pino Suarez Building In 1985 Mementioning

confidence: 99%

“…Some researchers introduced dampers into the core‐outrigger system to improve its seismic performance in recent years . Despite the application of dampers, the safety of the core‐outrigger system might still be threatened by a resonant ground motion that may be induced by soil filtering effect during the propagation of seismic energy.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers introduced dampers into the core-outrigger system to improve its seismic performance in recent years. [11][12][13][14][15] Despite the application of dampers, the safety of the core-outrigger system might still be threatened by a resonant ground motion that may be induced by soil filtering effect during the propagation of seismic energy. A ground motion is considered a resonant ground motion when its major energy is concentrated in a narrow frequency band and can lead to seismic resonant effect for a structure whose natural frequency is located in the same narrow band.…”

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confidence: 99%

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Shaking table test on seismic resonant behavior of core‐outrigger structure

Sun

Huang

et al. 2017

Structural Design Tall Build

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Summary In order to investigate disastrous seismic resonant effect of resonant ground motions on tall building structures, a 1/40 scaled planar test model of a 56‐story core‐outrigger structure was tested on shaking table considering two types of ground motions, that is, non‐resonant and resonant ground motions. The non‐resonant ground motions were chosen from far‐field natural earthquake records, whereas the resonant ground motions were generated through scaling Fourier spectra of the non‐resonant ones in a target period region covering one of the first two natural periods of the test model. The test results showed that (a) with the same small peak ground acceleration of 0.07 g, the test model exhibited significant hysteretic behavior, residual displacement, and even overturning collapse under the resonant ground motions but behaved elastically under the non‐resonant ones; (b) the first‐period resonant ground motion caused extremely large displacements on the upper floors and large moments on the lower stories, whereas the second‐period resonant ground motion resulted in extremely large accelerations on the upper and middle floors; (c) the first‐period resonant ground motion was more probable to trigger overturning collapse of the core‐outrigger system after some exterior columns had reached their axial compression strength, even for those columns on the middle stories.

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Section: For Example the Collapse Of Pino Suarez Building In 1985 Mementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Shaking table test on seismic resonant behavior of core‐outrigger structure

Sun

Huang

et al. 2017

Structural Design Tall Build

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“…Concrete outriggers are extended out from the concrete core to diagonally connect them to the steel corner megacolumns. There are steel plate shear links where the concrete outriggers and steel megacolumns are connected [42]. During normal wind and low seismic activities, the composite joined outrigger system provides the required stiffness to carry the applied loads.…”

Section: Adaptability Of Core-outrigger Structuresmentioning

confidence: 99%

Advances in Structural Systems for Tall Buildings: Emerging Developments for Contemporary Urban Giants

Ali

Moon

2018

Buildings

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New developments of tall buildings of ever-growing heights have been continuously taking place worldwide. Consequently, many innovations in structural systems have emerged. This paper presents a retrospective survey of the main structural systems for tall buildings with emphasis on the advancements of recent, emerging, and potentially emerging systems. A structural systems chart that was previously developed by the authors has been updated in this paper to recognize, categorize and add the more recent structural systems. Recent trends of tubular structural systems in modified forms including the braced megatubes and diagrids are presented. Core-outrigger structural systems are discussed with emphasis on their adaptability. The potential of employing superframes for stand-alone and conjoined megatall buildings is predicted. As a means to solve today's various project-specific complex design requirements, different mixed structural systems for supertall and megatall buildings are presented. This paper also discusses the widespread application of composite structural systems and recent trends of concrete cores for contemporary tall buildings. Finally, the future of tall buildings is predicted as the race for height continues.

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“…Outriggers connect the core tubes and perimeter columns efficiently, thereby transforming the global overturning moment into the axial forces of the perimeter columns, leading to a larger global lateral stiffness. Outriggers play an essential role in such a structural system, and many studies have been performed on the outriggers, such as the working mechanism and location optimization of outriggers . The dynamic characteristics of the structures equipped with outriggers were correlated from field measurement and numerical models .…”

Section: Introductionmentioning

confidence: 99%

Development of a novel sacrificial‐energy dissipation outrigger system for tall buildings

Liao

Cui

et al. 2019

Earthq Engng Struct Dyn

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Summary The frame‐core tube‐outrigger structural system is widely used in tall buildings, in which outriggers coordinate the deformation between the core tube and the moment frame, leading to a larger structural lateral stiffness. Existing studies indicate that outriggers can be designed as “fuses” of tall buildings through dissipating seismic energy after yielding, to protect the main structure. To date, both conventional and buckling‐restrained brace (BRB) outriggers have been applied in practice. Subjected to the maximum considered earthquake (MCE), the hardening effect of BRB outriggers increases the damage of other structural components. Meanwhile, conventional outriggers are difficult to repair, owing to the local buckling‐induced severe deterioration and damage. To overcome these problems, this study proposes a novel sacrificial‐energy dissipation outrigger (SEDO) to improve the seismic resilience of tall buildings. The chords of SEDO are made of high‐strength steel and remain elastic. The inclined braces of the SEDO are composed of a sacrificial part and an energy‐dissipating part. Therefore, the SEDO remains elastic under design‐based earthquakes (DBEs) and dissipates inelastic energy under MCEs. Moreover, the detailing of this novel SEDO is proposed on the basis of experimental studies. The optimal strength ratio between the sacrificial part and the energy‐dissipating part is determined in the range of 6:4 to 4:6 on the basis of nonlinear time history analyses (THAs) and parametric studies. Afterwards, the SEDOs are used in an actual tall building to verify their seismic performances through nonlinear THAs. The results indicate the proposed SEDO is able to protect other structural components and effectively improve the seismic resilience of tall buildings.

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The Evolution of Outrigger System in Tall Buildings

Cited by 32 publications

References 1 publication

Shaking table test on seismic resonant behavior of core‐outrigger structure

Shaking table test on seismic resonant behavior of core‐outrigger structure

Advances in Structural Systems for Tall Buildings: Emerging Developments for Contemporary Urban Giants

Development of a novel sacrificial‐energy dissipation outrigger system for tall buildings

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