CFRP修复PCCP的内水压试验  

Internal Water Pressure Tesing of PCCP Repaired by CFRP

作　　者：窦铁生 程冰清[1,2] 胡赫 夏世法 赵丽君[1,2] 

机构地区：[1]流域水循环模拟与调控国家重点实验室,北京100038 [2]中国水利水电科学研究院,北京100038

出　　处：《混凝土与水泥制品》2017年第12期35-40,共6页China Concrete and Cement Products

基　　金：国家自然科学基金项目(50979116);北京市科委重大专项课题(Z141100006014058)

摘　　要：为了验证CFRP的补强加固效果,采用2根内径2.6m的PCCP进行了内水压力试验,并通过集中断丝模拟了最不利断丝管的受力状况。结果表明,未粘贴碳纤维的断丝管,在设计内水压0.9MPa的状态下,断丝40根后管芯混凝土开裂。分部位粘贴1层、2层和3层环向碳纤维的加固管,在设计内压0.9MPa下,断丝70根后管芯混凝土开裂。CFRP在管芯混凝土出现微裂缝后参与应力重分布,一定程度上缓解了裂缝尖端的应力集中,延缓管芯混凝土开裂,同时,改善了非断丝区钢丝受力状态,延迟了钢丝和钢筒进入屈服状态。CFRP补强加固PCCP的效果明显。In order to verify the reinforcement effects of CFRP, two internal water pressure tests were carried out by using two PCCPs with an inner diameter of 2.6m, and simulated the most unfavorable situation by using centrally breaking wires. The results show that when the design pressure is 0.9MPa, the core concrete cracks after the broken wires of the non-adhesive carbon fiber pipes reaches 40. The pipe pastes 1 layer, 2 layers and 3 layers of CFRP parts by parts, when the design pressure is 0.9MPa and the number of broken wires is 70, its core concrete cracks. CFRP contributes to the stress redistribution after the microcracks in the concrete, which can alleviate the stress concentration at the tip of the crack and retard the cracking of the concrete. At the same time, the stress state of the wires in the non-broken wires zone improves and the yield state of the wires and the cylinder delays. The effects of CFRP reinforcement on PCCP is obvious.

关 键 词：碳纤维增强复合材料(CFRP) 预应力钢筒混凝土管(PCCP) 内水压 承载能力 断丝 

分 类 号：TU528.73[建筑科学—建筑技术科学]