Implementation of Effective Force Testing for Nonlinear Structures

Chae, Younbyoung; Rabiee, Ramin

doi:10.1061/(asce)st.1943-541x.0002186

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…When the movement of a vertical actuator connected to the end of FLB is not significantly affected by the movement of lateral actuator, the use of displacement sensor only to measure the bending deformation of FLB is enough to achieve a satisfactory axial force control, as observed in the existing RC column tests 15,18,21 . However, if the vertical actuator movement is appreciably affected by the lateral actuator movement, just using the displacement feedback is not sufficient and the velocity feedback may need to be implemented into the D‐ATS method, requesting the use of another additional sensors such as accelerometers 19,22 . Therefore, it is necessary to have supplemental sensors to improve the force control accuracy in the existing D‐ATS method, particularly when the vertical actuator's movement is significantly influenced by the lateral actuator's motion.…”

Section: Introductionmentioning

confidence: 99%

“…15,18,21 However, if the vertical actuator movement is appreciably affected by the lateral actuator movement, just using the displacement feedback is not sufficient and the velocity feedback may need to be implemented into the D-ATS method, requesting the use of another additional sensors such as accelerometers. 19,22 Therefore, it is necessary to have supplemental sensors to improve the force control accuracy in the existing D-ATS method, particularly when the vertical actuator's movement is significantly influenced by the lateral actuator's motion. Apparently, this comes with additional costs and effort to ensure the accuracy of the D-ATS method.…”

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confidence: 99%

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Improved real‐time force control for applying axial force to axially stiff members

Cho,

Chae,

Park

2023

Earthq Engng Struct Dyn

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One of the challenges in real‐time dynamic testing is effectively controlling axial forces for axially stiff members such as columns, walls, and base isolators. Axial force has a significant influence on structural strength and post‐yield behavior, thereby maintaining proper axial force boundary conditions is crucial for accurate seismic performance evaluation. To overcome this challenge, a displacement‐based force control method using the adaptive time series compensator (D‐ATS) was developed in the existing study, but this method requires additional sensors such as displacement transducers and accelerometers to ensure the accuracy of force control. In this study, a new real‐time force control method is introduced, which eliminates the need for additional sensors beyond the default sensors available in a typical servo‐hydraulic actuator. Newly developed modules are also provided, which can satisfactorily estimate the velocity and force change rate of actuator, while effectively mitigating oil‐column resonance. Experimental validation is conducted using lead rubber bearings (LRBs) subjected to axial force and lateral movements. The results demonstrate the exceptional performance of the new force control method, offering a convenient and cost‐effective approach for applying axial forces in real‐time dynamic testing.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Improved real‐time force control for applying axial force to axially stiff members

Cho,

Chae,

Park

2023

Earthq Engng Struct Dyn

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“…In this study, real-time hybrid simulation (RTHS) is performed on a small-scale base-isolated building with a rubber isolator and a small-scale MR damper. Unlike the shake table testing and effective force testing (EFT) requiring the entire structural system to be constructed in the laboratory (Chae and Rabiee, 2018), RTHS is an effective testing method that does not need the construction of the whole structure. It just requires the structural component of interest (experimental substructure), and the remaining part of the structure is modeled numerically (analytical substructure).…”

Section: Introductionmentioning

confidence: 99%

Real-time hybrid simulation for a base-isolated building with the transmissibility-based semi-active controller

Rabiee

Chae

2022

Journal of Intelligent Material Systems and Structures

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The transmissibility-based semi-active (TSA) controller was developed in the existing study by the authors, which can effectively enhance the performance of base-isolated buildings under both strong long- and short-period earthquake ground motions. Since the performance of the TSA controller was only evaluated with numerical simulation in the existing study, this paper further validates its performance experimentally by conducting real-time hybrid simulation (RTHS). A three-story base isolated building was designed based on a simplified design procedure, where the base isolation system of the building consisted of three different devices, that is, a magneto-rheological (MR) damper, rubber bearing, and linear bearings. The base isolation system was experimentally tested with the MR damper controlled by the TSA controller, and the building superstructure was analytically modeled. It was shown that the TSA controller makes the system damping high under long-period ground motions and low under short-period ground motions, which performed uniquely as intended. As a result, the isolator displacement was effectively reduced under long-period ground motions, while the story drift and acceleration responses were also reduced under short-period ground motions, all of which are difficult to achieve at the same time using passive damping only.

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