PVA-ECC加固RC足尺梁受弯性能试验研究  

Experimental Study of Full-scale RC Beam Reinforced by Polyvinyl Alcohol-engineered Cementitious Composite Mortar in Flexure

作　　者：卜良桃[1] 万长胜[1] 尹鹏[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2010年第1期5-10,共6页Journal of Hunan University:Natural Sciences

基　　金：湖南省科技厅科研资助项目(2007CK3066)

摘　　要：对6根足尺聚乙烯醇纤维水泥(PVA-ECC)加固的钢筋混凝土梁进行了正截面抗弯一次和二次受力的试验研究.通过与另1根同配置未加固钢筋混凝土梁的试验结果的对比,研究了加固梁纵向加固配筋率对抗弯承载力和变形能力的影响.试验采用三面U型加固形式,量测试验梁裂缝分布形态、荷载-挠度曲线、钢筋和混凝土应变发展规律等.试验结果表明PVA-ECC钢筋网薄层加固是一种有效的加固方法,能够显著地提高钢筋混凝土梁的抗弯承载力、截面刚度以及抗裂性能.An experimental study was conducted on the flexural behavior of reinfoced concrete beam strengthened by Polyvinyl Alcohol-Engineered Cementitious Composite （PVA-ECC） mortar subjected to one-off load and secondary load. Based on the comparison of the test results of six beams reinforced by PVA-ECC steel mesh and one general beams, the effect of tension reinforcement ratio on the flexural strength and deflections capacity was studied. Beams were reinforced with U-shape, and crack distribu- tion, load-max deflection, strain development of concrete and steel, etc. were measured. Test results have indicated that PVA-ECC steel mesh technology can greatly increase the carrying capacity and the stiffness of RC beams, which increases 81% to yield load and 91% to ultimate load. The rate of increased yield load with the strengthened beams subjected to one-off load is bigger than secondary load. In the same experimental method, the smaller the steel net spacing, the higher the yield load and ultimate load.

关 键 词：聚乙烯醇纤维水泥 钢筋混凝土梁 加固 二次受力 

分 类 号：TU323.3[建筑科学—结构工程]