Time-Dependent Fracture Behavior of Rock–Concrete Interface Coupling Viscoelasticity and Cohesive Stress Relaxation
Publication: Journal of Engineering Mechanics
Volume 149, Issue 2
Abstract
This study investigated the time-dependent crack propagation of the rock–concrete interface under sustained loading. First, sustained loading tests were performed on the composite rock–concrete beams under three-point bending with respect to three interface roughness degrees, i.e., natural, , and interfaces, and three sustained load levels, i.e., 80% of the maximum load, the initial cracking load, and 97% of the maximum load. Then, by employing the Norton-Bailey model and the time-dependent fictitious crack model, the constitutive relationships of bilateral materials and the rock–concrete interface were established and the mechanical responses of the rock–concrete interface under sustained loading were simulated. In addition, a crack propagation criterion proposed in this study was applied in the numerical procedure to simulate the time-dependent crack propagation process under sustained loading. The criterion implied that the interface crack propagated when the difference between the average elastic strain energy densities near the crack tip caused by the external load and cohesive stress exceeded that at the initial fracture status under quasi-static loading. The results indicated that the crack propagation under sustained loading could be interpreted from the view of energy balance between the driving energy from the external load and the resistance energy from the cohesive stress. The time-dependent crack propagation under sustained loading experienced three stages, i.e., decelerated propagation, uniform propagation, and accelerated propagation. A linear relationship between the logarithms of the crack mouth opening rate in the uniform propagation period and the failure time was established to predict the failure time of the rock–concrete interface under sustained loading.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China under Grants NSFC 51878117, NSFC 52179123, and NSFC 51979292. The author contributions are as follows: Wenyan Yuan: validation, formal analysis, investigation, writing—original draft; Wei Dong: conceptualization, project administration, supervision; Binsheng Zhang: data curation, writing—review and editing; and Hong Zhong: writing—review and editing.
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© 2022 American Society of Civil Engineers.
History
Received: May 23, 2022
Accepted: Sep 19, 2022
Published online: Nov 16, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 16, 2023
ASCE Technical Topics:
- Beams
- Composite beams
- Continuum mechanics
- Cracking
- Design (by type)
- Engineering fundamentals
- Engineering mechanics
- Fracture mechanics
- Load factors
- Load tests
- Material mechanics
- Material properties
- Materials engineering
- Maximum loads
- Measurement (by type)
- Models (by type)
- Simulation models
- Solid mechanics
- Static loads
- Statics (mechanics)
- Structural design
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
- Time dependence
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