Research on dynamic response characteristics and control effect of mega-sub controlled structural system under long-period ground motions

Wang, Xinwei; Zhang, Xun’an; Shahzad, Muhammad Moman; Wang, Tianlong

doi:10.1016/j.istruc.2020.11.044

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…The MSCSS has a 30% lower failure probability than the MSS, and the megastructure has a 50% lower failure probability than its substructure. MSCSS showed a response control rate of over 10% and a base shear control rate of 20% during long-period ground motions [18,19]. According to the MSCSS, the controlling effectiveness of structural acceleration and displacement at the top of a mega-frame with various arrangements and numbers of substructures ranged from 42% to 70% [20], whereas the controlling effectiveness of substructural acceleration and displacement ranged from 20% to 65%.…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Analysis of a New Mega-Subcontrolled Structural System (MSCSS) Subjected to Seismic Excitation

et al. 2022

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This paper seeks to examine the plastic deformation and seismic structural response of a mega-subcontrolled structural system (MSCSS) subjected to strong seismic excitations. Different MSCSS configurations were modeled with nonlinear finite elements, and nonlinear dynamic analyses were performed to examine their behaviors. This paper introduces a novel and optimized MSCSS configuration, configuration 30, which demonstrates remarkable results for the reduction of plastic strain. Utilizing a steel plate shear wall enhances the seismic structural integrity of this system (SPSW). This configuration improved the mean equivalent plastic strain of columns and beams by 51% and 80%, respectively. In addition, a comparison between unstiffened and ring-shaped infill panels of SPSWs demonstrates that ring-shaped infill panels offer greater lateral stiffness and energy dissipation with a 44% reduction in maximum equivalent plastic strain. Compared to configuration 1, configuration 30 exhibited the most controlled structural response, as the minimum residual story drift improvement was 70% in the first, second, and third substructures, respectively, and the maximum coefficient of variation (COV) was 16% and 32% in the acceleration and displacement responses, respectively.

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Section: Introductionmentioning

confidence: 99%

Plastic Deformation Analysis of a New Mega-Subcontrolled Structural System (MSCSS) Subjected to Seismic Excitation

et al. 2022

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“…MSCSS demonstrated a greater than 10% response control rate and an approximately 20% base shear control rate under long‐period ground motions. [ 11,12 ] The controlling effectiveness of the structural acceleration and displacement at the top of the mega‐frame of the MSCSS with various arrangements and numbers of substructures ranged from 42% to 70%, while the substructural acceleration and displacement ranged from 20% to 65%. [ 13 ]…”

Section: Introductionmentioning

confidence: 99%

Response control analysis of a new mega‐subcontrolled structural system (MSCSS) under seismic excitation

Shahzad

Zhang

Wang

et al. 2022

Structural Design Tall Build

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The mega-subcontrolled structural system (MSCSS) was proposed in the past decade as a new construction technique for high-rise buildings because it showed an improved structural seismic response. However, research continues to focus on further increasing the response control ability, minimizing the cost, and improving the seismic performance of MSCSS. In this paper, a novel configuration named configuration 13 is proposed that incorporates an inverted V-bracing (chevron) along the height in the center of the structure, and a mid-story isolation system is situated under the first mega-beam. The response control analysis and dynamic characteristics of the novel MSCSS are studied based on the structural responses to seven seismic waves. This novel configuration shows a significant improvement of at least 30.58% in the structural acceleration response with an average overall improvement of 49.7% under an El Centro wave. Moreover, nonlinear dynamic analysis is performed under the same seven waves; the proposed configuration shows the maximum pseudo-spectral acceleration under the El Centro input at low frequencies, while under the Kobe wave, acceleration peaks also appear at higher frequencies. Furthermore, the Hilbert-Huang transform is also applied, confirming that the proposed MSCSS shows no sudden fluctuations in its structural response under seismic excitation.

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“…The relative motion between the main structure and the sub-structure can dissipate the energy input by the earthquake, thereby controlling the seismic response of the structure. Since the mass ratio of the sub-structure to the main structure can reach 100%, MSCSS performs better than TMD in strong earthquakes [5][6][7]. Additional columns on sub-structures in the MSCSS can support mega-beams above, reduce bending moments in mega-beams, and allow for larger beam spans.…”

Section: Introductionmentioning

confidence: 99%

Failure Mode and Optimization for MSCSS with LRBs Based on IDA Method

et al. 2022

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The mega-sub controlled structure system with laminate rubber bearings is an emerging seismic control system for high-rise buildings. The system is high-order statically indeterminate with numerous failure modes. To study the failure modes of the structural system and further improve its seismic performance, the dynamic equations and the finite element model of the system were established. Ten different ground motions were selected from the Pacific Earthquake Engineering Research Center ground motion database for the incremental dynamic analysis (IDA). Based on the results of the IDA, the weakest failure mode of the system was identified, and its failure path was found. Two schemes were proposed to optimize the weakest failure mode of the system, and the optimization results were compared. The results show that although the IDA curves from different ground motion inputs are diverse, the plastic hinges are all formed on the sub-structures. Failures of the system are caused by either the excessive floor drift or the excessive shear deformation of rubber bearings. By adjusting the locations and parameters of dampers and rubber bearings, the seismic performance of the system can be improved.

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Research on dynamic response characteristics and control effect of mega-sub controlled structural system under long-period ground motions

Cited by 12 publications

References 20 publications

Plastic Deformation Analysis of a New Mega-Subcontrolled Structural System (MSCSS) Subjected to Seismic Excitation

Plastic Deformation Analysis of a New Mega-Subcontrolled Structural System (MSCSS) Subjected to Seismic Excitation

Response control analysis of a new mega‐subcontrolled structural system (MSCSS) under seismic excitation

Failure Mode and Optimization for MSCSS with LRBs Based on IDA Method

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