| 窦铁生,程冰清,胡赫,夏世法,赵丽君.CFRP修复PCCP断丝管的试验研究[J].中国水利水电科学研究院学报,2019,17(1):68-74 |
| CFRP修复PCCP断丝管的试验研究 |
| The experimental study on CFRP renewal of PCCP with broken wires |
| 投稿时间：2017-09-13 |
| DOI：10.13244/j.cnki.jiwhr.2019.01.010 |
| 中文关键词: 预应力钢筒混凝土管（PCCP） 碳纤维增强复合材料（CFRP） 工作压力 开裂 断丝 修复 |
| 英文关键词:Prestressed concrete cylinder pipe （PCCP） Carbon fiber reinforced polymer （CFRP） Working pressure Cracking Broken wires Renewal |
| 基金项目:国家自然科学基金项目（50979116）；北京市科委重大专项课题（Z141100006014058）；中国水科院科研专项（SM0145B632017） |
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| 中文摘要: |
| 为了验证CFRP修复PCCP断丝管的效果，采用两根内径2.6m的PCCP，管A为原管，管B为在管芯混凝土内表面粘贴CFRP的加固管，在不同内压作用下进行断丝，研究最不利情况下PCCP断丝破坏特征。管A在内水压力0.9MPa，断丝40根时，断丝区管芯混凝土应变突增，出现宏观裂缝，发生脆性破坏；管B在同样内水压力断丝70根时，断丝区管芯混凝土微裂缝持续扩展，继续加压至0.95 MPa时，管芯混凝土出现宏观裂缝，而非断丝区管芯混凝土受断丝影响不大。试验结果表明粘贴在管芯混凝土内壁上的CFRP与PCCP结构联合承载，在管芯混凝土出现微裂缝后参与应力重分布，限制了管芯混凝土裂缝的开展，调整了管体结构的受力状态，CFRP补强加固PCCP断丝管的效果明显。 |
| 英文摘要: |
| To verify the effects of Prestressed Concrete Cylinder Pipe(PCCP) with broken wires reinforced by Carbon Fiber Reinforced Polymer(CFRP), two PCCPs with an inner diameter of 2.6m were adopted. Pipe A was original and pipe B was reinforced with CFRP attached on the inner surface of the core concrete. The failure characteristics of PCCP with broken wires in the most unfavorable condition were researched by breaking wires under different internal pressure. When the internal water pressure was 0.9MPa and the number of broken wires were 40,the strain of core concrete in the broken wire zone of Pipe A increased abruptly. Meanwhile, the macro-cracks appeared and Pipe A suffered from brittle failure. In contract, the micro-cracks in the concrete core of Pipe B continued to expand when the number of broken wires reached 70 at the same internal water pressure with Pipe A, the macro-cracks of the concrete core emerged when the water pressure was up to 0.95MPa. However, the strain of the core concrete away from the broken wire zone did not show evident variation with the number of broken wires increasing. The results exhibited that the load was shared by the PCCP structure and the CFRP attached on the inner surface of the core concrete,which means that the CFRP participated in the stress redistribution after the onset of micro-cracks in the concrete, it constrained the propagation of the cracks and adjusted the stress state of the pipe structure. Th effects of CFRP reinforcement on PCCP with broken wires are remarkable. |
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