CFRP筋增强钢纤维混凝土梁受剪承载力试验与分析  

Experiment and Analysis on Shear Capacity of CFRP Reinforced Steel Fiber Concerte Beams

作　　者：宋守坛[1,2] 曹天 端宁 刘东运 SONG Shoutan;CAO Tian;DUAN Ning;LIU Dongyun(School of Civil Engineering,Southeast University,Nanjing 210096,China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China;Nanjing Normal University of Special Education,Nanjing 210038,China)

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]东南大学混凝土及预应力混凝土教育部重点实验室,江苏南京210096 [3]南京特殊教育师范学院,江苏南京210038

出　　处：《防灾减灾工程学报》2021年第5期1012-1019,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点研发计划(2017YFC0703006-01);江苏省博士后基金项目(1601148B)资助。

摘　　要：对CFRP箍筋和纵筋增强钢纤维混凝土梁的受剪承载力进行研究,通过6根梁的加载试验研究了剪跨比、配箍率和箍筋种类对受剪承载力的影响。考虑CFRP纵筋与混凝土的粘结性能,建立了CFRP筋增强钢纤维梁受剪承载力计算方法。结果表明:(1)CFRP筋增强钢纤维混凝土梁受剪承载力高,破坏前斜裂缝宽度大,破坏有明显预兆;(2)钢纤维可有效减小斜截面开裂后前期的CFRP箍筋应力,有利于箍筋强度发挥,CFRP箍筋的极限应变可取为0.004;(3)CFRP纵筋发挥强度高,需注意锚固长度和设计使用应力,防止滑移拔出和销栓破断;(4)给出的受剪承载力计算方法具有较高的计算精度高。The shear capacity of steel fiber concrete beams reinforced with CFRP stirrups and longitudinal bars was studied.The loading tests of 6 beams were conducted to study the effects of shear span ratio,stirrup ratio,and stirrup type on their shear capacity.The calculation method of shear capacity of CFRP reinforced steel fiber beam was proposed by considering the bonding properties between CFRP longitudinal bars and concrete.The test and analyzing results show that:CFRP reinforced steel fiber concrete beam has high shear capacity and shows large inclined crack width,which are obvious signs of beam failure;Steel fiber can effectively reduce the stresses of CFRP stirrups in the early stage after the occurrence of inclined cracks,which is beneficial to the exertion of stirrup strength.The ultimate strain of CFRP stirrups can be taken as 0.004;CFRP longitudinal bars have high strength,and attention should be paid to the anchorage length and design working stress to prevent interface slipping and dowel rupture;The proposed calculation method of shear bearing capacity has high calculation accuracy.

关 键 词：CFRP箍筋 CFRP纵筋 钢纤维混凝土 梁 抗剪承载力 

分 类 号：TU443[建筑科学—岩土工程]