Performance-based seismic analysis on a super high-rise building with improved viscously damped outrigger system

Lü, Xilin; He, Xiangdong; Zhou, Ying

doi:10.1002/stc.2190

Cited by 33 publications

(18 citation statements)

References 24 publications

(28 reference statements)

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“…The SEDO brace is modeled using the PERFORM-3D software, which is a widely used computer program for the nonlinear analysis of buildings under seismic actions. 16,31,32 The fiber model is used for the brace of SEDO, and the material property is set to the predefined buckling-material properties in PERFORM-3D ( Figure 8) with additional strength deterioration under tension, 33 which leads to a strength degradation in both tension and compression ( Figure 8). In addition, the parameters of the hysteresis curve are calibrated with the experimental results in Table 2.…”

Section: Numerical Modelingmentioning

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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Section: Numerical Modelingmentioning

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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“…They can adjust the magnitude of the control force. A large number of theoretical and experimental studies have been done [15][16][17][18][19]. The results reveal that among the different types of control devices, MR dampers are a promising type.…”

Section: Introductionmentioning

confidence: 99%

Vibration reduction on a cantilever Timoshenko beam control subjected to combined effects of wind and earthquake loads using damped outriggers

Metsebo

Ndemanou

Chamgoué

et al. 2021

International Advanced Researches and Engineering Journal

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This paper deals with the combined effects of wind and earthquake on the dynamic response of a cantilever structure. It is mainly composed of the core-structure, multi-outriggers with magneto-rheological (MR) dampers localized at different levels along of the structure and perimeter columns. These control devices are semi-active in nature and exhibit a nonlinear behaviour. One of their interesting characteristics is their ability to add supplementary energy dissipation to the structural system. Exposed to combined wind and earthquake loads, the core-structure is modelled using a Timoshenko cantilever beam. The stochastic approach based on the statistic properties is employed to estimate the degree excitations of the two natural hazards. The peak Root-Mean-Square (RMS) are evaluated to quantify the optimal location of damped outriggers. Defined as the control algorithm based on human reasoning, the Fuzzy logic is used to select the appropriate current that feeds the control devices. The obtained results indicate that the application of the fuzzy logic further minimizes the effects of bending-moment and shear force. All of these enhance the performance of the whole structural response and lead to a significantly reduction of excessive vibration to an acceptable level.

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“…e vibration reduction schemes used to control the wind vibration include tuned damping schemes with a tuned mass damper (TMD) [7,8] and energy dissipation schemes with viscous dampers. Because the deformation shape of high-rise building presents bending characteristics, compared with other energy dissipation schemes [9], a viscous damped outrigger can reduce the wind-induced acceleration with less viscous dampers while still yielding a high vibration reduction efficiency [10,11].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Mega‐Frame Core Wall Structures Equipped with Viscous Damped Outriggers for Human Comfort Performance under Wind Loading

Yang

Zhao

Shi

et al. 2021

Shock and Vibration

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Megatall and supertall buildings often adopt megastructure systems characterized by secondary structure systems, and the serviceability problem caused by wind-induced vibrations often becomes the dominant factor in the structural design. Because the deformation of a supertall building usually presents bending characteristics, a viscous damped outrigger can reduce the wind-induced vibration of a supertall building with the installation of a small number of viscous dampers. However, time history analysis of the prototype model considering the nonlinear characteristics of viscous dampers is time-consuming, which is not conducive for iterative design optimization. Additionally, the conventional simplified model composed of one cantilever beam cannot be used for the analysis and design of a viscous damped outrigger. In this study, a simplified wind-induced vibration prediction model is proposed based on the mechanical characteristics of megastructures. This simplified model is a plane model that includes both core walls and frames whose member size can be extracted from the original structure. Parametric analysis shows that the simplified model has high acceleration prediction accuracy. An optimal design method combined with the simplified model, which aims to minimize the damped outrigger system cost, is proposed. A 600-m supertall building is presented as a case study. The accuracy and effectiveness of the simplified model and the optimal design method proposed in this study are illustrated. Thus, applying this optimal design method in combination with the simplified model can save significant analysis and design time and is conducive to the application of viscous damped outriggers in practical engineering.

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Performance-based seismic analysis on a super high-rise building with improved viscously damped outrigger system

Cited by 33 publications

References 24 publications

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

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

Vibration reduction on a cantilever Timoshenko beam control subjected to combined effects of wind and earthquake loads using damped outriggers

Optimal Design of Mega‐Frame Core Wall Structures Equipped with Viscous Damped Outriggers for Human Comfort Performance under Wind Loading

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