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

Author:

Cho Chang Beck1,Chae Yunbyeong23,Park Minseok4

Affiliation:

1. Korea Institute of Civil Engineering and Building Technology Goyang South Korea

2. Department of Civil and Environmental Engineering Seoul National University Seoul South Korea

3. Institute of Construction and Environmental Engineering Seoul National University Seoul South Korea

4. Hybrid Structural Testing Center Myongji University Yongin South Korea

Abstract

AbstractOne 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.

Funder

Korea Basic Science Institute

National Research Foundation of Korea

Korea Agency for Infrastructure Technology Advancement

Publisher

Wiley

Subject

Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology,Civil and Structural Engineering

Reference23 articles.

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