期刊
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
卷 169, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2022.104335
关键词
Residual load-carrying capacity; Performance degradation; Impact test; Finite element analysis; Reinforced concrete beam
资金
- Natural Science Foundation of China [51808048]
- Project of Natural Science Basic Research of Shaanxi Province, China [2022JM-177]
- Fundamental Research Funds for the Central Universities, Chang'an University [CHD300102212911]
This study investigates the residual load-carrying performance of reinforced concrete beams after impact through experimental and numerical analysis. The results show that the resistance and stiffness of the beams decrease after impact, and the reinforcement ratio of longitudinal reinforcements and the yield state of compressive reinforcements play a critical role in the residual performance.
The residual load-carrying performance after impact is a key index to evaluate the impact-resistant capacity of engineering-used structure member. A multi-functional experimental facility was developed to conduct both the impact test and post-impact static loading test on two types of flexural-failure-dominated RC beam specimens with different tensile reinforcement ratios. Three-dimensional nonlinear finite element(FE) analysis was conducted to reproduce the impact process and to investigate the plastic damage of RC beam in depth. The degradation mechanism of load-carrying performance of RC beam after impact was investigated through fibersection analysis with uniaxial damaged material models of concrete and reinforcement. The experimental and numerical results demonstrate that the resistance and stiffness of impact-damaged RC beam decrease in different levels. The residual flexural resistance and stiffness ratios are greatly affected by the longitudinal reinforcements. The yield state of compressive reinforcements plays critical effect on the residual performance of RC beam after impact.
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