GFRP箍筋钢纤维混凝土梁的受剪试验研究及其斜裂缝宽度计算  

Experimental Study on Shear Behavior and Calculation of Diagonal Crack Width in Steel Fiber Reinforced Concrete Beams with GFRP Stirrups

作　　者：李文龙 黄伟[2] 赵善超[3] 张丽 LI Wenlong;HUANG Wei;ZHAO Shanchao;ZHANG Li(School of Information Engineering,Fuyang Normal University,Fuyang 236041,China;School of Architectural Engineering,Anhui University of Technology,Maanshan 243032,China;Chief Engineer’s Office,Ningbo Communication Construction Engineering Testing Center Co.,Ltd,Ningbo 315000,China)

机构地区：[1]阜阳师范大学信息工程学院,安徽阜阳236041 [2]安徽工业大学建筑工程学院,安徽马鞍山243032 [3]宁波市交通建设工程试验检测中心有限公司总师室,浙江宁波315000

出　　处：《安徽工业大学学报(自然科学版)》2025年第2期189-197,共9页Journal of Anhui University of Technology(Natural Science)

基　　金：安徽省高校自然科学基金重点项目(2022AH052823);安徽省高校优秀青年人才计划一般项目(YQYB2023111)。

摘　　要：为改善普通混凝土的抗裂性能,解决纤维增强聚合物(FRP)配筋混凝土梁变形大、斜裂缝过宽等问题,采用钢纤维混凝土制备玻璃纤维增强树脂基箍筋混凝土(GFRP–R–SFRC)梁试件,对GFRP–R–SFRC梁试件进行受剪试验,研究钢纤维掺量和剪跨比对试件斜裂缝分布和宽度的影响;考虑GFRP箍筋特性和钢纤维掺量的影响,修正GFRP箍筋应力计算方法,提出试件受剪的最大斜裂缝宽度计算公式。结果表明:掺入钢纤维可显著抑制GFRP–R–SFRC梁斜裂缝的萌生及发展,但较大的剪跨比不利于钢纤维抑裂效用的发挥;在一定的纤维掺量范围内,相同剪力条件下,GFRP–R–SFRC梁的斜裂缝宽度随纤维掺量的增加而减小;与未掺纤维的试件相比,掺量为1.5%(体积分数)的钢纤维梁试件的最大斜裂缝宽度减少了24.3%。提出的最大斜裂缝宽度公式计算结果与试验结果吻合较好,本文研究可为GFRP–R–SFRC梁在实际工程中的推广应用提供重要参考依据。To improve the crack resistance of ordinary concrete and address issues such as excessive deformation and wide diagonal cracks in fiber-reinforced polymer(FRP)reinforced concrete beams,steel fiber-reinforced concrete was used to prepare glass fiber-reinforced polymer bar-reinforced steel fiber-reinforced concrete(GFRP–R–SFRC)beam specimens.Shear tests were conducted on the GFRP–R–SFRC beam specimens to investigate the influence of steel fiber content and shear span ratio on the distribution and width of diagonal cracks.On this basis,considering the characteristics of GFRP stirrups and the influence of steel fiber content,the calculation method for GFRP stirrup stress was modified,and a formula for predicting the maximum width of diagonal cracks in the specimens under shear was proposed.The results show that incorporating steel fibers can significantly inhibit the initiation and propagation of diagonal cracks in GFRP–R–SFRC beams,although a larger shear span ratio is not conducive to the effectiveness of steel fibers in crack suppression.Within a certain range of fiber content,under identical shear conditions,the width of diagonal crack in GFRP–R–SFRC beams decreases with increasing fiber content.Compared to specimens without fiber,the maximum diagonal crack width of beams with 1.5%(volume fraction)steel fiber content is reduced by 24.3%.The calculated results from the proposed maximum diagonal crack width formula agree well with the experimental results.This study provides an important reference for the practical application and promotion of GFRP–R–SFRC beams in engineering.

关 键 词：混凝土梁 GFRP箍筋 钢纤维 剪跨比 斜裂缝 裂缝宽度 抗裂性能 

分 类 号：TU375.1[建筑科学—结构工程]