Seismic performance assessment of steel moment-resisting frames with self-centering viscous-hysteretic devices

Zhu, Ruizhao; Guo, Tong; Tesfamariam, Solomon

doi:10.1016/j.jcsr.2021.106987

Cited by 17 publications

(5 citation statements)

References 33 publications

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“…The experimental substructures, that is, SC-VDs, are composed of viscous dampers for energy dissipation and springs for self-centering. [49][50][51] The frame design is a two-story four-bay with a floor height of 4 m and a bay length of 9 m. The number of dampers for each story is 10 to maintain appropriate 50% contribution of restoring force, and the displacements are set to be consistent due to rigid diaphragm assumption. Therefore, the total force output of the SC-VDs on the same story can be considered as the measured force of a single damper device multiplied by 10.…”

Section: Methodsmentioning

confidence: 99%

A real‐time hybrid simulation framework for reliability‐based design optimization of structures subjected to pulse‐like ground motions

Peng,

Guo,

Chen

et al. 2024

Earthq Engng Struct Dyn

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Reliability‐based design optimization (RBDO) traditionally relies primarily on high‐fidelity and computationally expensive simulations to search for and evaluate design solutions. However, significant disparities could emerge for complex nonlinear behavior that are challenging for numerical modeling. In contrast to mitigating the impact of inaccurate numerical modeling through optimization algorithms, laboratory experiments realistically capture the complex nonlinear behavior of structures or their components. Real‐time hybrid simulation (RTHS) is widely considered as an efficient and cost‐effective technique for integrating numerical modeling with experimental testing for structural response evaluation. This study proposes an innovative framework that utilizes RTHS for the performance assessment of candidate designs to enable RBDO of structures subjected to pulse‐like ground motions. RTHS tests are conducted to physically evaluate structural responses through realistically replicating complex nonlinear behavior of experimental substructures. This study introduces a novel penalty function‐based efficient global optimization (P‐EGO) method to minimize the required number of laboratory tests through surrogating the response quantities of interest derived from RTHS. The proposed framework is experimentally evaluated for design optimization of a two‐story four‐bay steel moment‐resisting frame with self‐centering viscous dampers subjected to pulse‐like ground motions. The results demonstrate innovative application of RTHS in dynamic optimal design to account for uncertainties. It offers an effective and efficient alternative for traditional RBDO through pure computational simulation, particularly when structural components pose challenges for numerical modeling.

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Section: Methodsmentioning

confidence: 99%

A real‐time hybrid simulation framework for reliability‐based design optimization of structures subjected to pulse‐like ground motions

Peng,

Guo,

Chen

et al. 2024

Earthq Engng Struct Dyn

Self Cite

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“…Note that it is very challengeable to quantify the values of β c and β M for SMAFDBs, because the experimental data are very limited . The values given by Zhu et al (2021) may be considered, although the SC braces are different. However, as a comparative analysis, the conclusions obtained in the following sections could remain true if the β c and β M are specified.…”

Section: Fragility Assessmentmentioning

confidence: 99%

Mainshock-aftershock effect on the seismic performance of multi-story CBFs equipped with SMA-friction damping braces

Qiu

Jiang

2022

Journal of Intelligent Material Systems and Structures

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This paper aims to understand the effect of mainshock-aftershock earthquake sequences on the seismic performance of multi-story concentrically braced frames (CBFs) equipped with shape memory alloy (SMA) friction damping braces (SMAFDBs), based on a comparison with those equipped with buckling-restrained braces (BRBs). The SMAFDB is a serial connection of SMA damper and friction damper. The friction damper starts to slip and serves as the “fuse” element to protect the SMA damper under destructive earthquake events. Ten ground motion records corresponding to the maximum considered earthquake (MCE) hazard level are defined as the mainshock input, and the aftershock input is generated by appropriately scaling the mainshock input to four seismic hazard levels. To achieve a fair comparison, the considered CBFs are first designed to exhibit identical mean height-wise peak interstory drift ratios under the design-basis earthquake (DBE) ground motions. Then, these two frames are subjected to four suites of mainshock-aftershock earthquake sequences and their seismic responses are compared against each other. It indicates that both the peak and residual interstory drift ratios of the SMAFDB frame (SMAFDBF) are smaller than that of the BRB frame (BRBF) on average during the aftershock earthquakes, which is found primarily attributed to the fact that the former suffers from smaller post-mainshock residual deformation. The higher seismic capacity of the SMAFDBF over the BRBF is also confirmed by conducting fragility analysis. Finally, the recentering capacity under aftershock earthquakes are analyzed for both frames, based on the maximum residual interstory drift ratios.

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“…Li and Wang [36] developed the ductility demand spectra for hybrid selfcentering systems with self-centering dampers and viscous dampers. Zhu et al [37] enhanced the seismic performance of steel moment-resisting frames using self-centering viscoushysteretic devices. These investigations have confirmed the benefits of viscous dampers in improving the energydissipation capacity and reducing the peak inter-story drift and floor acceleration responses of self-centering systems.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the outcomes of the existing research [22][23][24][25][35][36][37], this paper proposes hybrid self-centering braced frames equipped with shape memory alloy-based self-centering braces (SMA-SCBs) and viscous dampers for achieving enhanced seismic performance. The major contribution of this paper is to investigate the constant-ductility inelastic displacement ratio of the hybrid self-centering braced frames and to develop a machine learning-driven performancebased seismic design method to achieve the desired maximum inter-story drift responses under considered seismic intensity.…”

Section: Introductionmentioning

confidence: 99%

Machine learning-driven performance-based seismic design of hybrid self-centering braced frames with SMA braces and viscous dampers

Hu¹,

Qiu²,

Zhu³

2022

Smart Mater. Struct.

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A hybrid self-centering braced frame equipped with shape memory alloy-based self-centering braces (SMA-SCBs) and viscous dampers is proposed to achieve enhanced seismic performance. Based on the proposed hybrid strategy combining the contributions of SMA-SCBs and viscous dampers, this paper investigates the advantages of such hybrid self-centering braced frames in achieving the desired maximum inter-story drift under a considered seismic intensity. To this end, the influence of design parameters of SMA-SCBs and viscous dampers on hybrid self-centering braced frames is examined through parametric dynamic analyses of equivalent single-degree-of-freedom (SDOF) systems. The analysis results indicate that the post-yield stiffness ratio α and energy dissipation factor β of SMA-SCB, and the contribution of viscous damper show significant influence on the peak displacement responses of hybrid self-centering braced frames. The constant inelastic displacement ratio prediction model for hybrid self-centering braced frames is developed using machine learning algorithms. A performance-based seismic design method is subsequently proposed for the hybrid self-centering braced frames to achieve the target displacement responses based on the developed machine learning models. Two hybrid self-centering braced frames are designed based on the proposed design method. Nonlinear dynamic analyses are conducted to investigate the seismic performance of the designed structures. To highlight the advantages of the hybrid self-centering braced frames, another six-story self-centering braced frame with SMA-SCBs only is also considered in this paper. The analysis results indicate that all the designed hybrid self-centering braced frames can achieve the desired performance objective. Compared to the self-centering braced frame with SMA-SCBs only, the hybrid self-centering braced frames can achieve much smaller base shear demand and absolute floor acceleration responses.

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Seismic performance assessment of steel moment-resisting frames with self-centering viscous-hysteretic devices

Cited by 17 publications

References 33 publications

A real‐time hybrid simulation framework for reliability‐based design optimization of structures subjected to pulse‐like ground motions

A real‐time hybrid simulation framework for reliability‐based design optimization of structures subjected to pulse‐like ground motions

Mainshock-aftershock effect on the seismic performance of multi-story CBFs equipped with SMA-friction damping braces

Machine learning-driven performance-based seismic design of hybrid self-centering braced frames with SMA braces and viscous dampers

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