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Plastic Buckling-Straightening Fatigue Life of Large Diameter Reinforcing Steel Bars
| 题名： | Plastic Buckling-Straightening Fatigue Life of Large Diameter Reinforcing Steel Bars |
| 正文语种： | eng |
| 作者： | Duck, David;Restrepo, Jose I.;Morrison, Machel L. |
| 作者单位： | Univ Calif San Diego||Univ Calif San Diego;Univ Calif San Diego;Univ Calif San Diego |
| 关键词： | Buckling;Cyclic loading;Digital image correlation;Fatigue;Fracture;Plastic buckling;Reinforcing bar;Sulfur concrete;Testing apparatus |
| 摘要： | Large infrastructure projects can efficiently use large diameter bars as longitudinal reinforcement in reinforced concrete elements. In earthquake-prone zones, critical regions of these elements must be detailed for ductility and hysteretic energy dissipation. Longitudinal bars in these regions are expected to sustain large-amplitude strain cyclic reversals before bar fracture occurs, in a mode of failure defining the collapse prevention limit state. To date, no successful large strain-amplitude cyclic loading testing has been reported on large-diameter reinforcing bars to observe the large-strain amplitude fatigue life of such bars, which often involves plastic bar buckling. This paper describes a test program designed to determine the plastic buckling/straightening fatigue life of ASTM A706 Grade 60 No. 18 bars (o57 mm) reinforcing bars subjected to cycles of reversed plastic strains. The design and implementation of the loading apparatus, critical for the gripping of the bars, the metallurgical characterization of the bars, and several key test results are discussed in the paper. Finally, the paper discusses a general unidimensional fatigue damage index precursor to bar fracture following a few plastic buckling and straightening cycles. |
| 出版年： | 2024 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 150 |
| 期： | 1 |
| 页码： | 1.1-1.16 |
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