钱凯, 谭鑫宇, 李治, 于晓辉. 高温下钢筋混凝土板抗冲击性能及其影响因素[J]. 工程力学, 2023, 40(1): 132-143, 154. DOI: 10.6052/j.issn.1000-4750.2021.08.0594
引用本文: 钱凯, 谭鑫宇, 李治, 于晓辉. 高温下钢筋混凝土板抗冲击性能及其影响因素[J]. 工程力学, 2023, 40(1): 132-143, 154. DOI: 10.6052/j.issn.1000-4750.2021.08.0594
QIAN Kai, TAN Xin-yu, LI Zhi, YU Xiao-hui. IMPACT PERFORMANCE AND THE INFLUENCE FACTORS OF REINFORCED CONCRETE SLABS UNDER HIGH TEMPERATURES[J]. Engineering Mechanics, 2023, 40(1): 132-143, 154. DOI: 10.6052/j.issn.1000-4750.2021.08.0594
Citation: QIAN Kai, TAN Xin-yu, LI Zhi, YU Xiao-hui. IMPACT PERFORMANCE AND THE INFLUENCE FACTORS OF REINFORCED CONCRETE SLABS UNDER HIGH TEMPERATURES[J]. Engineering Mechanics, 2023, 40(1): 132-143, 154. DOI: 10.6052/j.issn.1000-4750.2021.08.0594

高温下钢筋混凝土板抗冲击性能及其影响因素

IMPACT PERFORMANCE AND THE INFLUENCE FACTORS OF REINFORCED CONCRETE SLABS UNDER HIGH TEMPERATURES

  • 摘要: 钢筋混凝土(RC)结构在遭受火灾作用时,常会由于楼层坍塌而继发冲击作用,对楼板产生高温与冲击的耦合作用。该文同时考虑高温热力耦合效应和冲击荷载作用下的应变率效应,开展了高温下RC板抗冲击性能研究。通过分别将RC板抗火和抗冲击的试验结果与模拟结果进行对比,验证了该文所建立模型的正确性。分析获得了RC板在不同受火时间和不同能量冲击荷载作用下的动力响应,讨论了板厚和配筋率对高温下RC板抗冲击性能的影响。结果表明:火灾高温作用将显著影响RC板的抗冲击性能。随着受火时间的增加,RC板的冲切破坏损伤更加严重,RC板的跨中峰值位移也更大。板厚的增加能明显改善RC板的高温下的抗冲击性能,而配筋率的增加对RC板在高温下的抗冲击性能的影响有限。

     

    Abstract: When reinforced concrete (RC) structures are subjected to fire, they are often exposed to the secondary impact due to the fire-induced floor collapse, resulting in the coupling effect of high temperature and impact loading on RC slabs. This study examines the impact performance of RC slabs under high temperature considering the thermal mechanical coupling effect at elevated temperature and the strain rate effect under impact load. The established numerical model is validated by comparing the test results of fire resistance and impact resistance of RC slabs with the corresponding simulated results. The dynamic responses of RC slabs under different fire duration and different impact energy are obtained, and the influence of slab thickness and reinforcement ratio on the impact resistance of RC slabs under elevated temperatures is discussed. The results show that the high temperature caused by fire can significantly affect the impact resistance of RC slabs. The punching shear damage of RC slabs becomes severe with the increase of fire duration, and the mid-span peak displacement grows as well. The increase of slab thickness can significantly improve the impact performance of RC slabs under high temperature, while the rise of reinforcement ratio shows limited effect.

     

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