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| CFRC复合梁力学性能试验研究 |
| Experimental Study on Mechanical Properties of CFRC Composite Beams |
| 投稿时间：2017-04-05 修订日期：2017-05-08 |
| DOI： |
| 中文关键词: CFRC 复合梁 抗弯性能 裂缝抑制 |
| 英文关键词: CFRC composite beams flexural properties crack propagation restraint |
| 基金项目:国家自然科学基金项目-持载下混凝土内水分及氯离子传输过程的试验和细观数值方法研究（51378090） |
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| 中文摘要: |
| 碳纤维混凝土(Carbon Fiber Reinforced Concrete, CFRC)梁是在普通混凝土梁中掺入短切碳纤维，以此改善混凝土的性能。碳纤维弹性模量高，将其掺入混凝土中能改善混凝土的韧性并起到增强阻裂的效果。本文通过7组试验梁的三分点加载试验，研究RC梁与不同纤维层厚度、不同纤维长度的复合梁的弯曲破坏机理、荷载挠度行为、裂缝形态等。试验结果表明，在钢筋混凝土受弯构件的受拉区掺入短切碳纤维可以有效改善其变形能力；碳纤维对混凝土裂缝扩展的抑制、裂缝形态的改善效果较好；纤维层厚75mm，纤维长度10mm的复合梁性能最优。最后提出了碳纤维混凝土弯曲构件极限承载力的计算公式。 |
| 英文摘要: |
| Carbon fiber reinforced concrete (CFRC) beam，is a concrete beam which is reinforced with short carbon fiber, in order to improve the performance of concrete. CFRC toughness can be improved and the role of crack resistance can be enhanced by carbon fiber with high elastic modulus. Flexural behavior of RC/CFRC composite beams subjected to bending is studied experimentally in this paper. The effect of fiber layer thickness and carbon fiber length on the performance of the specimen was evaluated by four-point bending test of 7 group different specimens. The failure mechanism, load deflection behaviors, crack pattern of RC beams and RC/CFRC composite beams with different fiber layer thickness and fiber length were compared. The result shows that the deformation ability of concrete beams can be effectively improved by the addition of short carbon fiber into the tension zone. The carbon fiber shows positive effect on restraining crack propagation and changing crack distribution in concrete matrix. The composite beam with 75mm fiber layer thickness and 10mm fiber length shows the best performance. Finally, the equation of tensile strength is proposed. |
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