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Structural Engineering and Mechanics Volume 91, Number 3, August10 2024 , pages 239-250 DOI: https://doi.org/10.12989/sem.2024.91.3.239 |
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A couple Voronoi-RBSM modeling strategy for RC structures |
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Binbin Gong and Hao Li
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| Abstract | ||
| With the aim to provide better predication about fracture behavior, a numerical simulating strategy based on the rigid spring model is proposed for reinforced concrete (RC) structures in this study. According to the proposed strategy, concrete is partitioned into a series of irregular rigid blocks based on the Voronoi diagram, which are connected by interface springs. Steel bars are simulated by bar elements, and the bond slip element is defined at bar element nodes to describe the interaction between reinforcement and concrete. A concrete damage evolution model based on the separation criterion is adopted to describe the weakening process of interface spring between adjacent blocks, while a nonlinear bond slip model is introduced to simulate the synergy behaviour of reinforced steel bars and concrete. In the damage evolution model of concrete, the influence of compressive stress perpendicular to the interface on the shear strength is considered. To check the effectiveness and applicability of the proposed modelling, experimental and numerical studies about a simply-supported RC beam and the two-notched concrete plates in Nooru-Mohamed's experiment are conducted, and the grid sensitivity are investigated. | ||
| Key Words | ||
| cracks; fracture behavior; reinforced concrete; rigid body spring model; Voronoi diagram | ||
| Address | ||
| Binbin Gong: College of Civil Engineering, Hunan City University, Yiyang 413000, China; Hunan Engineering Research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure, Yiyang 413000, China Hao Li: CCCC Third Highway Engineering Co., Ltd, Beijing 100102, China | ||