Research on the disaster prevention mechanism of mega-sub controlled structural system by vulnerability analysis

Wang, Xinwei; Zhang, Xun’an; Shahzad, Muhammad Moman; Shi, Xiangyu

doi:10.1016/j.istruc.2021.07.036

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…With reference to the current Chinese code for seismic design of buildings (GB50011-2010) [51], a k is taken as 0.2 g. Then, the mean of a is 1.17 m/s 2 . About 10~20 earthquake records are required for dynamic analysis to evaluate the seismic performance of structures [52]. Therefore, 20 seismic records for NLTHA were chosen from the ground motion database of PEER Center, taking the design spectrum in GB50011-2010 as the target spectrum.…”

Section: Numerical Studiesmentioning

confidence: 99%

Reliability-Based Design Optimization of Structures Considering Uncertainties of Earthquakes Based on Efficient Gaussian Process Regression Metamodeling

Xiao

Yue

Wang

et al. 2022

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The complexity of earthquakes and the nonlinearity of structures tend to increase the calculation cost of reliability-based design optimization (RBDO). To reduce computational burden and to effectively consider the uncertainties of ground motions and structural parameters, an efficient RBDO method for structures under stochastic earthquakes based on adaptive Gaussian process regression (GPR) metamodeling is proposed in this study. In this method, the uncertainties of ground motions are described by the record-to-record variation and the randomness of intensity measure (IM). A GPR model is constructed to obtain the approximations of the engineering demand parameter (EDP), and an active learning (AL) strategy is presented to adaptively update the design of experiments (DoE) of this metamodel. Based on the reliability of design variables calculated by Monte Carlo simulation (MCS), an optimal solution can be obtained by an efficient global optimization (EGO) algorithm. To validate the effectiveness and efficiency of the developed method, it is applied to the optimization problems of a steel frame and a reinforced concrete frame and compared with the existing methods. The results show that this method can provide accurate reliability information for seismic design and can deal with the problems of minimizing costs under the probabilistic constraint and problems of improving the seismic reliability under limited costs.

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Section: Numerical Studiesmentioning

confidence: 99%

Reliability-Based Design Optimization of Structures Considering Uncertainties of Earthquakes Based on Efficient Gaussian Process Regression Metamodeling

Xiao

Yue

Wang

et al. 2022

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“…After applying the classic damping assumption, the damping ratios of the superstructure, bottom structure, and isolation system, the first modal damping ratio, and the first modal participation mass ratio can be written as follows: From Equation (18), if the effective lateral stiffness is much smaller than the elastic lateral stiffnesses of the superstructure and bottom structure, then the first modal damping ratio will approach the first modal damping ratio of the isolation system. The relationship between the superstructure and bottom structure frequency is as follows [42,43]: (20) From Equation ( 20), the higher-order modal coupling is independent of the isolation frequency, which means that higher-order modal coupling will be prevented in the midstory isolation system.…”

Section: {B}mentioning

confidence: 99%

“…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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“…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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Research on the disaster prevention mechanism of mega-sub controlled structural system by vulnerability analysis

Cited by 11 publications

References 35 publications

Reliability-Based Design Optimization of Structures Considering Uncertainties of Earthquakes Based on Efficient Gaussian Process Regression Metamodeling

Reliability-Based Design Optimization of Structures Considering Uncertainties of Earthquakes Based on Efficient Gaussian Process Regression Metamodeling

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

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