Experimental Study on Dynamic Fracture Properties of Concrete under Small Eccentricity Loading
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 8
Abstract
In practical engineering, concrete structures usually work with cracks, and seismic loads often deviate from the center of the cracks. Therefore, exploring the strain rate effect on the fracture performance of concrete under small eccentricity is of great significance. In order to explore the dynamic fracture properties of concrete under different loading positions, considering four strain rates and four eccentric displacement factors, combined with digital image correlation (DIC), a hydraulic servo machine is used to conduct three-point bending beam fracture tests on concrete. By conducting tests under different working conditions, the concrete fracturing morphology, load-crack mouth opening displacement (-CMOD) curves, and mechanical characteristic values were obtained. The influence of strain rate and loading position on concrete fracture properties is analyzed. The results show that the initial fracture load and unstable load of concrete fracture increase with the increase of loading eccentricity displacement and loading strain rate. A model for the relationship between concrete unstable load, loading eccentricity, and strain rate is established based on the experimental results. Under the coupling effect of high-strain rate and high-loading eccentricity, the crack propagation speed of concrete increases sharply after reaching the peak load. The fracture toughness of concrete increases linearly with the increase of loading eccentricity and strain rate. The unstable toughness of concrete shows a trend of first increasing and is then almost unchanged with the increase of strain rate, and gradually increasing with the increase of loading eccentricity displacement. At the same loading position, the fracture energy of concrete increases with the increase of strain rate, with a maximum growth rate of 40.5%. At the same strain rate, the fracture energy of concrete gradually increases with the increase of loading eccentricity, with a maximum growth rate of 56.6%. The research results provide a theoretical basis for the initiation and development of concrete cracks under medium to low strain rates and small eccentric loads.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is supported by the National Natural Science Foundation of China (No. 52208488). The authors are grateful for the support of the Foundation.
Author contributions: Zhenpeng Yu: Conceptualization, Methodology, Formal analysis, Resources, Writing–review and editing, Project administration, Funding acquisition. Xiongfei Zhan: Investigation, Writing–original draft, Visualization. Yuanhao Chang: Writing–original draft, Resources. Lu Hai: Conceptualization, Resources, Supervision, Writing–review and editing.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 15, 2023
Accepted: Feb 2, 2024
Published online: Jun 3, 2024
Published in print: Aug 1, 2024
Discussion open until: Nov 3, 2024
ASCE Technical Topics:
- Concrete
- Continuum mechanics
- Cracking
- Design (by type)
- Dynamic loads
- Dynamic properties
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fracture mechanics
- Load factors
- Material mechanics
- Materials engineering
- Solid mechanics
- Strain
- Strain rates
- Structural behavior
- Structural design
- Structural dynamics
- Structural engineering
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