BFRP筋钢纤维再生混凝土梁抗弯性能试验研究

复合材料科学与工程 ›› 2019, Vol. 0 ›› Issue (11): 5-11.

• 基础研究 • 下一篇

BFRP筋钢纤维再生混凝土梁抗弯性能试验研究

孔祥清, 韩飞, 邢丽丽, 王学志

辽宁工业大学土木建筑工程学院,锦州 121001

收稿日期:2019-01-10 出版日期:2019-11-28 发布日期:2019-11-28
作者简介:孔祥清(1982-),女,博士,教授,研究方向为新型材料及结构力学性能,xqkong@lnut.edu.cn。
基金资助:
国家自然科学基金项目(51479168);辽宁省自然科学基金(SY2016001)

FLEXURAL BEHAVIOUR OF STEEL FIBER-REINFORCED RECYCLED AGGREGATE CONCRETE BEAMS REINFORCED WITH BFRP REBARS

KONG Xiang-qing, HAN Fei, XING Li-li, WANG Xue-zhi

Department of Civil & Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, China

Received:2019-01-10 Online:2019-11-28 Published:2019-11-28

摘要/Abstract

摘要： 为了研究不同钢纤维体积掺量v_sf(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v_sf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v_sf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。

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

Abstract: In order to investigated the influence of the different volume fraction of steel fibers v_sf (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 v_sf, 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 v_sf, 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.

Key words: BFRP bar, steel fiber, recycled aggregate concrete beams, flexural capacity, replacement ratio of recycled aggregate

中图分类号:

TB332

孔祥清, 韩飞, 邢丽丽, 王学志. BFRP筋钢纤维再生混凝土梁抗弯性能试验研究[J]. 复合材料科学与工程, 2019, 0(11): 5-11.

KONG Xiang-qing, HAN Fei, XING Li-li, WANG Xue-zhi. FLEXURAL BEHAVIOUR OF STEEL FIBER-REINFORCED RECYCLED AGGREGATE CONCRETE BEAMS REINFORCED WITH BFRP REBARS[J]. Composites Science and Engineering, 2019, 0(11): 5-11.

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BFRP筋钢纤维再生混凝土梁抗弯性能试验研究

FLEXURAL BEHAVIOUR OF STEEL FIBER-REINFORCED RECYCLED AGGREGATE CONCRETE BEAMS REINFORCED WITH BFRP REBARS

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