Vibration control parameters investigation of the Mega-Sub Controlled Structure System (MSCSS)

Limazie, Toi; Zhang, Xun’an; Wang, Xianjie

doi:10.12989/eas.2013.5.2.225

Cited by 24 publications

(14 citation statements)

References 11 publications

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“…In 1995, Feng and Mita for the first time proposed an innovative vibration control system, a mega‐substructure configuration composed of a main structure to resist loads and some substructures acting as giant TMDs. Thereafter, many studies on the vibration control of mega‐substructures have been performed, and new forms of mega‐substructure systems have been proposed, including the multifunctional vibration absorption reinforced concrete (RC) mega‐frame structures, the passive mega‐sub controlled structures, and the vibration absorption RC mega‐frame suspension systems . Currently, mega structure systems, such as mega‐frame systems and mega column‐core tube‐outrigger truss systems, are widely adopted in super‐tall buildings due to their high lateral stiffness and flexible layout.…”

Section: Concept Of the Vrsmentioning

confidence: 99%

“…The vibration reduction effect of VRSs has been confirmed by Lan et al and Wang et al through analytical studies and shaking table tests. Zhang et al, Limazie et al and Tan et al further discussed parameter optimizations for the VRSs. Nevertheless, most existing research has primarily focused on multi‐story buildings and tall buildings with the vibration period less than 1.5 s and their seismic responses are largely controlled by the lower‐order vibration modes.…”

Section: Concept Of the Vrsmentioning

confidence: 99%

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Floor acceleration control of super‐tall buildings with vibration reduction substructures

Zhang

Guan

et al. 2016

Structural Design Tall Build

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Summary When a super‐tall building is subjected to service level earthquakes (SLEs) or design basis earthquakes (DBEs), its excessive floor acceleration due to the acceleration amplification effect can lead to unacceptable economic loss and functional interruption. This work aims to design the top stories of super‐tall buildings in a form of a vibration reduction substructure (VRS; acting as a giant TMD with a large mass ratio) to control the floor acceleration of the building subjected to SLEs and DBEs. A simplified analytical model for 300 m super‐tall buildings is developed based on the flexural‐shear coupling beam model. Using the simplified model with a VRS on the top of the building, the floor acceleration reduction effect of the VRS is studied through time history analysis under actual ground motions. The optimal frequency of the VRS to reduce the floor acceleration is determined through parametric discussion, and the feasibility of using the VRS for different layouts of super‐tall buildings is validated. The outcome of this study is expected to provide some references for engineering design to mitigate vibration of super‐tall buildings.

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Section: Concept Of the Vrsmentioning

confidence: 99%

Section: Concept Of the Vrsmentioning

confidence: 99%

Floor acceleration control of super‐tall buildings with vibration reduction substructures

Zhang

Guan

et al. 2016

Structural Design Tall Build

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“…Qin et al and Zhang et al have investigated the control performances of mega‐sub controlled structures with different control strategies. Seismic responses of a mega‐sub controlled frame with friction damper were analyzed by Lian et al Limazie et al have investigated the dynamical characteristics and controlling performances of the mega‐sub controlled structure when subjected to strong earthquake motion by designing a reasonable and realistic scaled model. Many studies on the performance of mega‐sub controlled structure have been conducted by theoretical analysis, yet experimental investigations of the mega‐sub isolation structure are rare.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of mega‐sub isolation structure

Tan

Zhang

et al. 2017

Structural Design Tall Build

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As urban high-rise buildings increase, a mega-sub configuration is proposed by engineers, which consists of two major structural components, a megastucture as the load-bearing main structural frame and several functional substructures for residential or other usage. This paper presents a new mega-sub isolation structure, in which substructures are designed to isolate from megastructure using special isolation devices. The equations of motion of the mega-sub isolation structure are established, and its vibration mitigation mechanism is investigated systematically using a simplified lumped mass structural model. With the increase in substructure mass, working mechanism of mega-sub isolation structure is changed from tuned vibration absorber, mid-story isolation to base isolation. In the light of theoretical studies, three steel frame specimens of four mega frame stories were tested. The experimental results show that the isolated structure and lower substructure-consolidated structure perform better than aseismic structure, and transfer functions derived from the test data support the conclusion of theoretical analysis that the control mechanism of this novel mega-sub isolation structure is similar to mid-story isolated structure in the case of the mass ratio between the substructure and the megastructure closed to 1, which is the most general situation in engineering.

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“…Seismic responses of the mega-sub controlled frame with friction damper were analyzed by Lian et al [8,9]. Limazie et al [10] investigated the dynamical characteristics and controlling performances of the mega-sub controlled structure subjected to strong earthquake motion by designing a reasonable and realistic scaled model. In this paper, the equation of motion of the mega-sub isolation system is established when the substructures are simplified as multi-degree of freedom system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Reliability Analysis of Mega-Sub Isolation System Under Random Ground Motion

Li¹,

Li²,

Liu³

et al. 2017

TOCIEJ

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Introduction:The equation of motion of the mega-sub isolation system is derived in the present study. Then, the parameter optimization of the mega-sub isolation system is studied to illustrate the effects of the damping and stiffness of the isolation devices on the reliability of the system.Methods:Moreover, based on the first passage mechanism, the calculation procedure of the dynamic reliability of the system is presented. In this procedure, the story drift of the structure is used as the evaluation.Results and Conclusion:Numerical example shows that when the damping ratio of the isolation device is given, the overall reliability of the structure increases at first then decreases with increased frequency ratio, when the frequency ratio is constant, the overall reliability of the structure increases with increased damping ratio. In addition, compared to the aseismic system, the overall reliability of the mega-sub isolation system is significantly improved.

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Vibration control parameters investigation of the Mega-Sub Controlled Structure System (MSCSS)

Cited by 24 publications

References 11 publications

Floor acceleration control of super‐tall buildings with vibration reduction substructures

Floor acceleration control of super‐tall buildings with vibration reduction substructures

Experimental investigation of mega‐sub isolation structure

Dynamic Reliability Analysis of Mega-Sub Isolation System Under Random Ground Motion

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