纤维网格增强超高性能混凝土加固钢筋混凝土梁受剪性能试验研究  

Experimental Study on Shear Performance of Fiber Mesh Reinforced Ultra-High-Performance Concrete for Strengthening Reinforced Concrete Beams

作　　者：王青 WANG Qing(Department of Civil Engineering,Hefei Science and Technology College,Hefei Anhui 231201,China)

机构地区：[1]合肥科技职业学院建筑工程系,安徽合肥231201

出　　处：《菏泽学院学报》2023年第5期65-71,共7页Journal of Heze University

基　　金：安徽省重点自然科学项目(KJ2021A1605)。

摘　　要：为了分析影响钢筋混凝土梁受剪性能的因素,提出了纤维网格增强超高性能混凝土加固钢筋混凝土梁受剪性能试验研究.以纤维网格增强超高性能混凝土加固后的钢筋混凝土梁为研究对象,设计了6个无腹筋梁试件和4个有腹筋梁试件,通过模板制作、加固筋笼制作、浇筑混凝土、养护及拆模、粘贴应变片和刷白、画线等步骤,加工了钢筋混凝土梁试件,结合试件的加载,测试了钢筋混凝土梁受剪性能.结果显示,增加荷载之后,无腹筋梁试件和有腹筋梁试件都会出现裂缝;增大剪跨比后,钢筋混凝土梁的极限荷载和初裂荷载逐渐减小;增大配箍率时,C40试件梁的极限荷载和初裂荷载逐渐增大,C80试件梁的极限荷载和初裂荷载逐渐减小;增大配箍率时,钢筋混凝土梁的极限荷载也随之增大.In order to analyze the factors affecting the shear performance of reinforced concrete beams,an experimental study on the shear performance of fiber mesh reinforced ultra-high-performance concrete for strengthening reinforced concrete beams was proposed.Using reinforced concrete beams reinforced with fiber mesh reinforced ultra-high-performance concrete as the research object,six specimens of beams without stirrups and four specimens of beams with stirrups were designed.Through processes such as formwork fabrication,reinforcement cage fabrication,concrete casting,curing,demolding,strain gauge installation,surface treatment,and marking,the reinforced concrete beam specimens were prepared.Shear performance tests were conducted in conjunction with loading.The results showed that after increasing the load,both the specimens without stirrups and the specimens with stirrups exhibited cracking.As the shear span ratio increased,the ultimate load and initial cracking load of the reinforced concrete beams gradually decreased.Increasing the stirrup ratio led to a gradual increase in the ultimate load and initial cracking load of the C40 specimens and a gradual decrease in the ultimate load and initial cracking load of the C80 specimens.With an increase in the stirrup ratio,the ultimate load of the reinforced concrete beams also increased.

关 键 词：纤维网格 受剪性能 钢筋混凝土梁 极限荷载 初裂荷载 

分 类 号：TU318[建筑科学—结构工程] TU375