
科学技术与工程

中国技术经济学会
CFRP加固爆炸损伤UHTCC梁抗弯性能试验
刘蓝玉 , 彭胜 , 谢先启 , 姚颖康 , 何理 , 陈翔 , 贾永胜
科学技术与工程 ›› 2026, Vol. 26 ›› Issue (10) :4336-4343
CFRP加固爆炸损伤UHTCC梁抗弯性能试验
Experiment on Flexural Performance of CFRP-reinforced Blast-damaged UHTCC Beams
为研究碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)加固爆炸损伤超高韧性水泥基复合材料(ultra high toughness cementitious composite,UHTCC)梁的抗弯性能,制备了7根不同纤维种类及箍筋间距的UHTCC梁。通过跨中接触爆炸损伤模拟(120 g乳化炸药)、CFRP加固与加固后四点弯曲试验,获取了试件破坏形态、荷载-挠度曲线及UHTCC和CFRP的应变演变规律。结果表明:随着箍筋间距增大,CFRP加固爆炸损伤UHTCC梁的破坏模式由弯曲破坏转变为剪压破坏;掺入纤维显著提升了梁的抗弯承载力(钢纤维提升幅度最大,达到11.68%),缩短了屈服平台;提高了UHTCC极限应变(钢纤维提升6.69%)和CFRP剥离应变(PE纤维提升7.73%),应变性能随箍筋间距增大而降低(钢纤维降幅最大达到46.40%);所建抗弯承载力计算模型与试验吻合良好。
The flexural behavior of CFRP (carbon fiber reinforced polymer)-reinforced blast-damaged UHTCC (ultra high toughness cementitious composite) beams was investigated in this study. Seven UHTCC beams with different fiber types and stirrup spacings were prepared. The experimental procedure was conducted as follows: mid-span contact explosion simulation (using 120 g emulsion explosive), CFRP strengthening, and four-point bending tests. Through these tests, the failure modes, load-deflection relationships, and strain development in UHTCC and CFRP were systematically analyzed. The results indicate that the failure mode is shifted from flexural failure to shear-compression failure with the increase of stirrup spacing. The incorporation of fibers significantly improves the flexural capacity (with steel fibers exhibiting the highest enhancement of 11.68%), but the yielding stage is shortened simultaneously. In addition, fibers increase the ultimate strain of UHTCC (6.69% increase achieved by steel fibers) and the debonding strain of CFRP (7.73% increase achieved by PE fibers). However, the strain capacity is found to decline with larger stirrup spacings, and the most severe deterioration is observed in beams with steel fibers (reaching 46.40%). Finally, a proposed flexural capacity model is verified to agree well with the experimental data.
碳纤维增强复合材料 / 超高韧性水泥基复合材料 / 抗弯承载力 / 损伤加固
CFRP(carbon fiber reinforced polymer) / UHTCC(ultra high toughness cementitious composite) / flexural bearing capacity / damage reinforcement
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湖北省自然科学基金(2022CFB662)
武汉市知识创新专项项目曙光计划(2023020201020403)
江汉大学精细爆破全国重点实验室开放基金(PBSKL2022D05)
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