【作者】 张海霞； 李程翔； 刘国瑞；

【Author】 ZHANG Hai-xia;LI Cheng-xiang;LIU Guo-rui;School of Civil Engineering,Shenyang Jianzhu University;

【机构】 沈阳建筑大学土木工程学院；

【摘要】 为了研究表面内嵌FRP筋加固混凝土梁的剪切延性,该文在研究加固梁的受力过程、破坏模式以及荷载-跨中挠度曲线的基础上,引用能量表示法,对12根加固梁的试验结果进行了剪切延性系数方面的比较分析,研究了FRP类型、GFRP间距、GFRP倾角、原梁箍筋间距等四个不同试验参数对试验梁剪切延性的影响规律。试验结果表明:内嵌同一种FRP材料会使加固梁的剪切延性随着内嵌材料角度的增大而增大,随着FRP筋间距以及原梁箍筋间距的增大而减小。表面内嵌FRP筋加固方法不仅能够提高混凝土加固梁的抗剪承载力,而且使加固梁的剪切延性得到显著的提高,从而对增强建筑结构抗震能力的研究具有重要意义。更多还原

【Abstract】 In order to study the shear ductility of reinforcement concrete beams strengthened by NSM FRP bars. The energy expression method is introduced in this paper to analysis the Shear ductility behaviors of 12 reinforced concrete beams strengthened with NSM FRP bars based on the stress process, failure mode and load deflection-curve of the experimental beam. The effects of FRP type, GFRP spacing, GFRP angle and stirrup spacing on failure mode and shear ductility were analyzed. The test results show that the shear ductility of reinforcement concrete beams strengthened by same NSM FRP materials can increase with the increase of FRP angle, and decrease with the increase of stirrup spacing and FRP spacing. The strengthening method of NSM GFRP rods not only enhance the shear bearing capacity of reinforced concrete beams, but also improve remarkably the shear ductility of beams. Therefore, it plays an important role in the study of the seismic capacity of building structures.更多还原