摘要
为了研究不同钢纤维体积掺量vsf(0. 5%、1%、1. 5%、2%),纵筋配筋率ρ,再生骨料取代率R(0、50%、100%)对BFRP筋钢纤维再生混凝土梁(BFRP-SFRAC梁)抗弯性能的影响,本文对9根BFRP-SFRAC梁和1根钢筋钢纤维再生混凝土梁(对比梁)进行了抗弯试验,分析了其破坏形态、承载力变化过程及挠度变形等情况。结果表明:BFRP-SFRAC梁在达到极限承载力后,其荷载-挠度曲线下降段平滑,表现出较好的延性特征。BFRP-SFRAC梁的抗弯承载力受配筋率ρ和钢纤维体积掺量vsf的影响较大,受再生骨料取代率R的影响较小。随着钢纤维体积掺量vsf的增加,BFRP-SFRAC梁的初裂荷载和极限荷载均增加,但并不一直呈线性增长,而挠度变形有所减小。与对比梁相比,BFRP-SFRAC梁的初裂荷载略低,但极限荷载却明显提高。
In order to investigated the influence of the different volume fraction of steel fibers vsf(0. 5%,1%,1. 5%,2%),longitudinal reinforcement ratio ρ and recycled aggregate replacement rate R(0,50%,100%) on the bending behaviour of steel fiber reinforced recycled concrete beams reinforced with BFRP bars(BFRP-SFRAC)beams,the bending performance tests of nine BFRP-SFRAC beams and one steel fiber reinforced recycled concrete beams reinforced with steel bars(control beam) were carried out. The failure mode,flexural capacity and deflection deformation,etc.,were analyzed. The results show that the section strain of BFRP-SFRAC beams meets the plane section assumption,and the descending branch of the load-deflection curve of the BFRP-SFRAC beam has a smooth drop,which indicates that the post-peak behaviours of the BFRP-SFRAC beams show better ductility characteristics.The flexural capacity of BFRP-SFRAC beams is greatly affected by reinforcement ratio ρ and volume fraction of steel fiber vsf,and less affected by replacement ratio of recycled aggregate. Both the initial cracking load and the ultimate load increase with the increase of the volume fraction of steel fiber vsf,but it does not always increase linearly,while the deflection deformation decreases. It is also found that the initial cracking load of the BFRP-SFRAC beam is slightly lower than that of the control beam,but the ultimate load is obviously improved.
作者
孔祥清
韩飞
邢丽丽
王学志
刘华新
KONG Xiang-qing;HAN Fei;XING Li-li;WANG Xue-zhi(Department of Civil & Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China)
出处
《玻璃钢／复合材料》
CAS
北大核心
2019年第11期5-11,23,共8页
Fiber Reinforced Plastics/Composites
基金
国家自然科学基金项目(51479168)
辽宁省自然科学基金(SY2016001)
关键词
BFRP筋
钢纤维
再生混凝土梁
抗弯承载力
再生骨料取代率
BFRP bar
steel fiber
recycled aggregate concrete beams
flexural capacity
replacement ratio of recycled aggregate
