Seismic Response Reduction of Megaframe with Vibration Control Substructure

Huang, Junqi; Xiao, Chong; Jiang, Qing; Xian-guo, YE; Wang, Hanqin

doi:10.1155/2018/9427908

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…This structural system, utilizing the vibration of the suspended floors to adjust the dynamic characteristics of the primary structure, has a good seismic performance. The suspended floors are similar to a larger mass pendulum, like a tuned mass damper (TMD) [5][6][7] or multiple tuned mass damper (MTMD) [8,9] system, and have even more advantages over these systems, in that no additional mass is required and the mass ratio is higher.…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Cai

Kaewunruen

2019

Applied Sciences

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In this study, a series of shaking table tests of a ten storey concrete suspended structure equipped with viscous dampers were carried out to evaluate the dynamic responses and vibration damping performance of suspended structures. The effects of link types between the primary structure and suspended floors and different seismic excitations on the response of suspended structure models was verified. The responses include the damping ratio, the frequency, maximum relative displacements, accelerations and maximum strains of the suspended structures. Test results showed that the damping ratio and the frequency of suspended structures installed with dampers (called damping suspended structure) are adjusted compared with a conventional suspended structure with rigid-bar links (conventional suspended structure). Maximum relative displacements of the primary structure of the damping suspended structure were distinctly smaller than those of the conventional suspended structure. However, the maximum relative displacement between the primary structure and the suspended floors of the damping suspended structure was significantly larger than that of the conventional structure, indicating that the swing of the suspended floor can help dissipate seismic energy. The peak acceleration and acceleration amplification factors of the damping suspended structure were less than the conventional suspended structure. Moreover, the peak acceleration response of the damping suspended structure was slightly behind the conventional suspended structure. The damping suspended structure certainly had a considerable and stable reduction for strain response, and the maximum strain response was decreased by 42.3%–72.7% for the damping suspended structure compared with the conventional suspended structure.

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Section: Introductionmentioning

confidence: 99%

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Cai

Kaewunruen

2019

Applied Sciences

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“…The critical parameters, namely, the frequency ratio between the mega‐frame and substructure (the value of the frequency ratio is 0.96) and the LRB damping coefficient, are proposed according to previous analyses of MFVCSs by the authors of the present study 20 . The LRBs are designed according to the results and similarity ratios.…”

Section: Test Of the Shaking Table Modelmentioning

confidence: 99%

“…Similarly, Li et al 19 conducted a shaking table test to evaluate the dynamic behaviors of three steel MFVCSs. Furthermore, based on a validated FE model, the authors of the present study recently proposed a new kind of MFVCS with a single vibration control substructure (VCS) and analyzed the optimized values of the frequency of the substructure and the damping provided by lead–rubber bearings (LRBs) on the seismic response reduction in the MFVCS 20 . The above studies validated the high performance (in terms of reducing both the seismic response and the wind response) of the MFVCS and presented a practical way to construct an optimized MFVCS that employs LRBs to connect the bottoms of the substructure columns with the mega‐beam.…”

Section: Introductionmentioning

confidence: 99%

Shaking table model test of a mega‐frame with a vibration control substructure

Jiang

Wang

Xian-guo

et al. 2020

Structural Design Tall Build

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Summary A mega‐frame with a vibration control substructure (MFVCS) is a tuned mass damper system that converts substructures into a tuned mass. In this study, a kind of MFVCS using lead–rubber bearings (LRBs) to connect the vibration control substructure to the mega‐frame was proposed. To investigate the damping effect of this MFVCS, a series of shaking table tests were conducted, and the seismic responses of the MFVCS were compared with those of the traditional mega‐frame structure (TMFS). The results show that the seismic responses of the MFVCS are clearly smaller than those of the TMFS; additionally, the proposed MFVCS can provide a sufficient damping effect under different ground motions. Finite element (FE) models of the TMFS and MFVCS were established and validated by experimental results. Finally, the simulation results adopting different LRB models (equivalent linear and nonlinear elements) were compared, and the results indicate that simulation results can be obtained with greater accuracy from the FE model with a nonlinear LRB model than that with a linear LRB model.

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Seismic performance of suspended‐floor structures with viscous dampers considering acceptable interstory drift

Zeng

Gao

Qing

et al. 2021

Structural Design Tall Build

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Numerical studies of suspended-floor structures were conducted, and viscous dampers were applied to improve their seismic performances. The following issues were analyzed under 20 earthquake records: seismic responses of the primary structure and suspended floors, the distributions of the damping coefficient c 0 , and the interstory stiffness of the suspended floors. There was a significant reduction in the roof drift and the base shear force of the cores after replacing the steel bars with viscous dampers. The suspended-floor structures with viscous dampers exhibited an optimal c 0 . The suspended-floor structure with a triangular distribution of c 0 showed a smaller seismic response than the one with a uniform distribution of c 0 . Under the design-based earthquake, there was complete damage of nonstructural components in the y-direction. Hence, applications of diagonal steel braces within the 1st to 10th floors were suggested to increase the lateral stiffness of the suspended floors in the y-direction. The application of diagonal steel braces reduced the story drift S d of the suspended floors, resulting in slight damage to nonstructural components under the design basis earthquake (DBE) hazard level. However, the roof floor, which contains electrical and mechanical components, exhibited an increase in S d after the application of the diagonal steel braces. With increasing stiffness of the diagonal brace, the story drift profile of the suspended floors tended to be uniform, and the suspendedfloor structures with the uniform distribution of c 0 exhibited seismic performances closer to those of the suspended-floor structures with the triangular distribution of c 0 .

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Seismic Response Reduction of Megaframe with Vibration Control Substructure

Cited by 6 publications

References 23 publications

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Shaking Table Tests of Suspended Structures Equipped with Viscous Dampers

Shaking table model test of a mega‐frame with a vibration control substructure

Seismic performance of suspended‐floor structures with viscous dampers considering acceptable interstory drift

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