表面内嵌玻璃纤维增强材料筋加固混凝土梁抗弯性能试验  

EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOR OF CONCRETE BEAMS STRENGTHENED WITH NEAR-SURFACE MOUNTED GFRP BARS

作　　者：张海霞[1] 孔丹丹[2] 刘国瑞[1] 

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168 [2]河北工业大学土木工程学院,天津300132

出　　处：《工业建筑》2011年第10期20-24,共5页Industrial Construction

基　　金：建设部研究开发项目(2009-k2-34)

摘　　要：为了探究表面内嵌玻璃纤维增强材料(GFRP)加固混凝土的抗弯性能,通过对表面内嵌GFRP筋加固混凝土梁试件的抗弯试验,探究了加固梁受力过程和破坏形式;通过对加固试件与未加固试件的荷载-位移关系曲线和荷载-应变关系曲线的对比分析;探讨典型试件裂缝的开展和分布规律,进一步研究原梁内纵向钢筋配筋率和GFRP筋加固量对梁抗弯性能的影响。试验研究结果表明,表面内嵌GFRP筋加固方法不仅不同程度地提高了试件的屈服荷载和极限荷载,而且也提高了梁屈服阶段和破坏阶段的截面刚度,并在限制裂缝开展方面起到了一定有利的作用。The objective of this study is to investigate the flexural behaviors of reinforced concrete beam with nearsurface mounted （NSM） GFRP bars. The tests of a group of simply supported rectangular cross-section beams strengthened with NSM GFRP bars and two control beams are carried out. The mode of failure, load-deflection relationship, and load-strain eurve of the all specimens are analyzed. Cracks propagation is discussed based or, measured data. The two effect factors of ratio of steel reinforcement in the beam and amount of GFRP bars on flexural behaviour are studied further. The studies indicate that not only yield and ultimate load of the beam are significantly enhanced, but also the flexural stiffness in the yield and uhimate behavior state of the beam is improved by using NSM-GFRP bars. The studies also show that there has a beneficial contribution to restriction on crack propagation.

关 键 词：表面内嵌 GFRP筋 加固 混凝土梁 抗弯性能 

分 类 号：TU375.1[建筑科学—结构工程]