Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

Cai, Xuesong; Yang, Chengyu; Yuan, Yong

doi:10.3390/app10041331

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…Furthermore, it has been adopted in a range of applications for structural performance evaluation, including wind turbine structures [7], offshore platforms [17], steel structures [18,19], and wood shear wall structures [20]. It is worthy to mention that RTHS is also useful for reinforced concrete [21,22] and masonry structures owing to its unique features [23,24].…”

Section: Background and Motivationmentioning

confidence: 99%

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Wang

Bao

et al. 2020

Applied Sciences

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To improve the experimental accuracy and stability of shaking table substructure testing (STST), an explicit central difference method (CDM) and a three-variable control method (TVCM) with velocity positive feedback (VPF) are proposed in this study. First, the explicit CDM is presented for obtaining an improved control accuracy of the boundary conditions between the numerical and experimental substructures of STST. Compared with the traditional CDM, the proposed method can provide explicit control targets for displacement, velocity, and acceleration. Furthermore, a TVCM-VPF is proposed to improve the control stability and accuracy for loading the explicit control targets of displacement, velocity, and acceleration. The effectiveness of the proposed methods is validated by experiments on a three-story frame structure with a tuned liquid damper loaded on an old shaking table originally designed with the traditional displacement control mode. The experimental results show that the proposed explicit CDM works well, and the response rate and control accuracy of the shaking table are significantly improved with the contribution of the TVCM-VPF compared with those of the traditional proportional integral derivative (PID) controller. This indicates the advantage of the proposed TVCM-VPF over the traditional PID for STST. A comparison between the traditional shaking table test and STST shows that when the latter is based on the TVCM-VPF, it exhibits an excellent performance in terms of the stability and accuracy of displacement and an acceptable performance in terms of the acceleration accuracy.

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Section: Background and Motivationmentioning

confidence: 99%

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Wang

Bao

et al. 2020

Applied Sciences

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“…Footnote "0" refers to a case of the uncontrolled underground structure without any control devices. Given the established measurement system, Daikai station was adopted as a typical example [38] to demonstrate the seismic-vibration mitigation effect and the feasibility of the proposed NSAS isolation system. The obtained effectiveness and design can be used as guidelines for other typical underground structures with similar and more complex typologies.…”

Section: Sfmentioning

confidence: 99%

A Novel Negative Stiffness Amplification System Based Isolation Method for the Vibration Control of Underground Structures

2020

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Underground structures can be vulnerable during strong earthquakes, and seismic mitigation systems designed for these structures are instrumental in improving multiple aspects of seismic performance. To deal with this problem, a novel isolation system is proposed for underground structures, employing the incorporation of a negative-stiffness amplification system (NSAS) and an isolator. The proposed NSAS consists of the subconfiguration of a spring with positive stiffness in parallel with a dashpot, which is then in series with a negative-stiffness device. The mechanical model and physical realization of the NSAS are presented, based on which the energy-dissipation-enhancement mechanism of NSAS is detailed. On this basis, comprehensive parameter analyses were conducted between the NSAS isolation system and a conventional isolation system. Analysis results showed that the NSAS exhibited a significant energy-dissipation-enhancement effect, in which the series connection of the negative and positive stiffnesses amplified the dashpot’s deformation for enhanced energy-dissipation capacity and efficiency. Compared with a conventional isolator, the NSAS isolation system provided the underground structure with a multiperformance and multilevel mitigation effect, particularly yielding lower responses of displacement and shear forces at the same time. More vibration energy could be dissipated by NSAS, thereby alleviating the energy-dissipation burden of underground structures.

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“…The measurement noise variance R is set to 1 × 10 -4 , which is determined by the characteristics of the noise level. Similar to that used in the last subsection, the initial covariance matrix is given by P 0 = diag([11.1688 2 20.4226 2 13.6773 2 3.4339 2 ]).…”

Section: Numerical Validationmentioning

confidence: 99%

“…Real-time hybrid simulation (RTHS) is a dynamic experimental method that deals with time-dependent specimens [1], and is an extension of hybrid simulation [2,3] originating from the pseudo-dynamic test [4]. In RTHS, the emulated structure, which is typically large-scale, is divided into numerical and physical portions.…”

Section: Introductionmentioning

confidence: 99%

Kalman Filter-Based Adaptive Delay Compensation for Benchmark Problem in Real-Time Hybrid Simulation

Ning

Wang

2020

Applied Sciences

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Real-time hybrid simulation (RTHS) is a versatile, effective, and promising experimental method used to evaluate the structural performance under dynamic loads. In RTHS, the emulated structure is divided into a numerically simulated substructure (NS) and a physically tested substructure (PS), and a transfer system is used to ensure the force equilibrium and deformation compatibility between the substructures. Owing to the inherent dynamics of the PS and transfer system (referred to as a control plant in this study), there is a time-delay between the displacement command and measurement. This causes de-synchronization between the boundary of the PS and NS, and affects the stability and accuracy of the RTHS. In this study, a Kalman filter-based adaptive delay compensation (KF-ADC) method is proposed to address this issue. In this novel method, the control plant is represented by a discrete-time model, whose coefficients are time-varying and are estimated online by the KF using the displacement commands and measurements. Based on this time-varying model, the delay compensator is constructed employing the desired displacements. The KF performance is investigated theoretically and numerically. To assess the performance of the proposed strategy, a series of virtual RTHSs are performed on the Benchmark problem in RTHS, which was based on an actual experimental system. Meanwhile, several promising delay-compensation strategies are employed for comparison. Results reveal that the proposed time-delay compensation method effectively enhances the accuracy, stability, and robustness of RTHS.

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Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

Cited by 12 publications

References 20 publications

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

Shaking Table Substructure Testing Based on Three-Variable Control Method with Velocity Positive Feedback

A Novel Negative Stiffness Amplification System Based Isolation Method for the Vibration Control of Underground Structures

Kalman Filter-Based Adaptive Delay Compensation for Benchmark Problem in Real-Time Hybrid Simulation

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