Residual resistance and bearing mechanism of RC beam after impact

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (11) : 122-130.

TONG Chaokang, ZHANG Jingfeng, JI Haohao, DU Wei, XUN Feifan

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Abstract

The residual performance after impact loading is a key index to evaluation the anti-impact ability of structures. In order to investigate the residual resistance of reinforced concrete(RC)beam and the post-impact bearing mechanism. The drop hammer impact tests, as well as the static loading tests after impact, are conducted on 12 simply supported RC beams. High-resolution explicit dynamic finite element approach is adopted to get the impact and post-impact static loading responses. The effects of impact energy, as well as the structural parameters (i.e., tensile reinforcement ratio, compressive reinforcement ratio, stirrups ratio and concrete strength) on residual bearing performance of RC beam are discussed. The formula for predicting the residual resistance of impact-damaged RC beam is regressed according to the experimental and numerical simulation data. The essential reasons affecting the residual bearing capacity of impact-damaged RC beams are analyzed finally. The experimental and numerical results show that severe concrete spalling occurs at the contact zone impacted by drop hammer. Significant vertical and oblique cracks can be observed at the mid-span. Higher impact energy causes more severe impact damage of RC beam. The ultimate bearing capacity of RC beam under various impact cases decrease at a certain extent. The increased ratios of compressive reinforcement and stirrups alleviate the deterioration of bearing capacity. Larger reduction percentage on the resistance of impact-damaged RC beam is yielded by the case with larger tensile reinforcement ratios, though it has larger flexural resistance. No obvious difference can be found on the residual performance of RC beams under various concrete strengths, which demonstrates that the residual resistance is not affected by the concrete strength. Whether the bearing capacity of RC beam decreases after impact depends on its failure pattern at ultimate stage.

Key words

reinforced concrete beam / drop hammer impact test / residual bearing performance / prediction model / bearing mechanism

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TONG Chaokang, ZHANG Jingfeng, JI Haohao, DU Wei, XUN Feifan. Residual resistance and bearing mechanism of RC beam after impact[J]. Journal of Vibration and Shock, 2023, 42(11): 122-130

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