不同表面特征GFRP筋加固钢筋混凝土T形梁抗剪试验研究  

Experimental Study on Shear of T-shaped Concrete Beams Reinforced with Different Surface Characteristics of GFRP Bars

作　　者：张延年[1] 付丽[1] 李朝阳[1] 刘新[1] 郑怡 熊卫士 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁省建筑材料监督检验院,辽宁沈阳110032 [3]重庆交通建设(集团)有限责任公司,重庆401147

出　　处：《工程抗震与加固改造》2015年第2期90-96,114,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51078065);质检公益性行业科研专项项目(201210040);重庆市自然科学计划项目(CSTC2012jj A30007);沈阳市科技计划项目(F12-271-4-00)

摘　　要：为研究不同表面特征的GFRP筋对加固后钢筋混凝土梁抗剪性能的影响,以不同混凝土强度等级、不同纵筋配筋率以及不同表面特征GFRP筋为参数,对9根钢筋混凝土T形梁进行了表面内嵌GFRP筋的静力加载试验,并分析其影响因素。结果表明,GFRP筋的表面特征是影响加固梁破坏形态的重要因素,光圆GFRP筋加固梁更容易发生粘结破坏。内嵌GFRP筋不能提高试验梁的纯弯段开裂荷载,但能提高弯剪段开裂荷载、屈服荷载和极限荷载。光圆GFRP筋加固对弯剪段开裂荷载影响显著,螺纹GFRP筋加固对屈服荷载和极限荷载影响明显。GFRP筋的表面特征对加固梁抗剪承载力的影响要大于混凝土强度等级和纵筋配筋率。GFRP筋表面特征对其应变大小有明显影响,螺纹GFRP筋的应变远大于光圆GFRP筋,因此螺纹GFRP筋利用率高,加固效果好。Nine beams are tested by static loading test to study the influence of shear performance of T-shaped concrete beams reinforced with near surface mounted GFRP bars. Different strength grade of concrete,different reinforcement ratio and different surface characteristics of GFRP bars are studied and the factors are analyzed. The results show that the surface character of GFRP bars is the important factor to affect the failure mode of strengthened beams,and the bond failure happens more easily in the strengthened beams with glossy GFRP bars. The cracking load pure bending section of test beams with near surface mounted GFRP bars is not increased,while the bending shear cracking load,yield load and ultimate load are increased. Glossy GFRP bars reinforcement has significant effect on cracking load bending shear,thread GFRP bars reinforcement has obvious effect on the yield load and ultimate load. Surface characteristics of GFRP bars influence shear bearing capacity of reinforced beams more than strength grade of concrete and the ratio of reinforcement. Surface characteristics of GFRP bars have obvious influence on the strain,the strain of thread GFRP bars is far greater than glossy GFRP bars,the utilization rate of thread GFRP bars is high,the reinforcement effect is good.

关 键 词：钢筋混凝土梁 加固 GFRP筋 抗剪承载力 

分 类 号：TU375.1[建筑科学—结构工程]