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EXPERIMENTAL RESEARCH ON PRESTRESS LOSS IN TECHNIQUE OF CONCRETE STRUCTURE STRENGTHENED WITH PRESTRESSED CFRP SHEETS
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摘要: 预应力碳纤维布加固混凝土结构技术是一种加固效果明显、应用前景广阔的加固技术,在这项技术中预应力损失是一个至关重要的问题。根据试验中所使用的张拉设备以及施工工艺,对张拉过程中装置变形造成的损失、粘贴碳纤维布过程中的损失、放张碳纤维布时的损失、材料特性造成的长期损失的产生机理进行了分析。试验中重点对2组试件共7根混凝土梁碳纤维布放张后的预应力损失做了深入研究,并提出了放张后预应力损失计算公式。还提出了有效预应力的计算公式及减少预应力损失的一些措施。Abstract: The technique of concrete structure strengthened with prestressed CFRP sheet is an effective technique with a bright future.Prestress loss is an important problem in this technique.It is analyzed the production mechanism of long loss because of deformation of drawing machine,pasting CFRP sheet,releasing CFRP sheet,and the material's property.In the experiment the prestress loss of releasing CFRP sheet is discussed in detail,relevant factors including prestressed degree,anchorage treatments,and layers of CFRP sheets are analyzed.Finally it is also given the equation of calculating effective prestress and some advice of decreasing the prestress loss.
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Key words:
- prestressed CFRP sheet /
- concrete structure /
- prestress loss
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岳清瑞, 杨勇新. 纤维增强复合材料与现代基础设施建设. 中国有色金属学报, 2004(5) Wight R G, Green M F, Erki M-A. Prestressed FRP Sheets forPoststrengthening Reinforced Concrete Beams. Journal of Composites forConstruction,2001(11): 214-220 尚守平, 彭 晖, 童 桦, 等, 预应力碳纤维布加固混凝土受弯构件的抗弯性能研究. 建筑结构学报, 2003(5) Yang Yongxin, Yue Qingrui. Experimental Study of RC BeamsStrengthened with Prestressed CFRP Sheets MThe Eighth InternationalSymposium on Structural Engineering for Young Experts. Xuzhou:2004 李庆伟. 预应力碳纤维布加固混凝土结构预应力损失及锚固方式试验研究: [ 硕士学位论文]. 北京: 中冶集团建筑研究总院, 2005 Wu Z S, Iwashita K. Strengthening PC Girders with ExternallyPrestressed PBO Fiber Sheets M International Conference on FRPComposites in Civil Engineering. Hong Kong: 2001: 1 085-1 092 李国平. 预应力混凝土设计原理. 北京: 人民交通出版社, 2001 -
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