Experimental Study on Flexural Performance of Concrete Beams with Steel Fiber and Fully Recycled Coarse Aggregate

Chunyang LIU; Yifan GU; Yingqi GAO; Guixin YU; Jian YU

doi:10.13409/j.cnki.jdpme.20201220001

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Experimental Study on Flexural Performance of Concrete Beams with Steel Fiber and Fully Recycled Coarse Aggregate

更新时间：2025-09-25

- Experimental Study on Flexural Performance of Concrete Beams with Steel Fiber and Fully Recycled Coarse Aggregate
- Journal of Disaster Prevention and Mitigation Engineering Vol. 41, Issue 5, Pages: 946-953(2021)
- 作者机构：
  
  1.山东建筑大学土木工程学院，山东济南 250101
  2.山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室，山东济南 250101
  3.山东明冉再生资源利用有限公司，山东济南 250101
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.20201220001
  CLC： TU443
- Published：15 October 2021
- 稿件说明：
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刘春阳,顾一凡,高英棋等.钢纤维全再生粗骨料混凝土梁抗弯性能试验研究∗[J].防灾减灾工程学报,2021,41(05):946-953.

LIU Chunyang,GU Yifan,GAO Yingqi,et al.Experimental Study on Flexural Performance of Concrete Beams with Steel Fiber and Fully Recycled Coarse Aggregate[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):946-953.
刘春阳,顾一凡,高英棋等.钢纤维全再生粗骨料混凝土梁抗弯性能试验研究∗[J].防灾减灾工程学报,2021,41(05):946-953. DOI： 10.13409/j.cnki.jdpme.20201220001.

LIU Chunyang,GU Yifan,GAO Yingqi,et al.Experimental Study on Flexural Performance of Concrete Beams with Steel Fiber and Fully Recycled Coarse Aggregate[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):946-953. DOI： 10.13409/j.cnki.jdpme.20201220001.

摘要

混凝土梁良好的抗弯性能是影响建筑结构安全性的重要因素。为研究加入钢纤维的全再生粗骨料钢筋混凝土梁抗弯力学性能，设计了4根全再生粗骨料混凝土梁和1根天然粗骨料混凝土梁，主要设计参数为全再生粗骨料取代率，钢纤维体积分数，预损程度以及碳纤维布（CFRP）加固。通过单调加载试验对5根梁的破坏形态、荷载-跨中挠度曲线、钢筋应变变化特征等抗弯性能进行了研究，采用ABAQUS有限元软件对各试件的加载过程进行了建模分析，基于现有规范和试验数据对各试件的峰值承载力计算方法进行了研究。研究结果表明，各试件梁均发生典型受弯破坏，掺加纤维后梁的受压区混凝土破碎脱落范围减小；全再生粗骨料混凝土梁的抗弯承载能力较普通混凝土梁降低约6%，掺加钢纤维后梁的抗弯承载力较未掺加钢纤维的全再生粗骨料混凝土梁提高约5%，钢纤维的掺入亦可改善混凝土梁的变形能力；采用碳纤维布直接加固后的梁承载力提高约20%，先预损后进行碳纤维布加固后的梁承载力可提高约14%，碳纤维布还可显著提高试验梁的整体刚度；ABAQUS有限元软件分析结果与试验结果吻合较好，可较为准确地模拟梁的破坏形态和抗弯性能；现有规范公式及文中修正方法得到的抗弯承载力计算值与试验值相比误差较小，二者均可用于钢纤维全再生粗骨料混凝土梁的设计。

Abstract

The good flexural performance of concrete beams is an important factor affecting the safety of building structures. In order to study the flexural mechanical properties of reinforced concrete beams with fully recycled coarse aggregate and steel fiber， four fully recycled coarse aggregate concrete beams and one natural coarse aggregate concrete beam were designed. The main design parameters were the replacement rate of fully recycled coarse aggregate， volume fraction of steel fiber， pre-damaged degree， and reinforcement with carbon fiber sheet （CFRP）. The failure characteristics， load-mid span deformation curves， and strain variation characteristics of steel bars of the five beams were studied by monotonous loading tests. The finite element software ABAQUS was used to simulate and analyze the loading process of the five beams and the calculation method of peak carrying capacity of each beam was also studied based on the existing design specifications and test data. The results show that flexural failure occurred in all specimens， the broken and fall-off zone of concrete beams with fiber in compression zone was reduced. Compared with concrete beams with ordinary coarse aggregate， the flexural bearing capacity of beams with fully recycled coarse aggregate was decreased by 6%. The flexural bearing capacity of the beam after adding steel fiber is about 5% higher than that of the fully recycled coarse aggregate concrete beam without steel fiber. The addition of steel fiber can also improve the deformability of the concrete beam. The bearing capacity of beams strengthened directly with CFRP could be increased by about 20%， and the bearing capacity of CFRP reinforced beams increases by about 14% when the beam was pre-damaged. The overall stiffness of the beams could also be enhanced by CFRP. The finite element analysis results of ABAQUS were in good agreement with the test results， and the calculation results of the peak bearing capacity of each specimen beam based on the current design code and the proposed formulas in this paper were also in good agreement with the test results. Both bearing capacity calculation methods can be used in the design of concrete beam with steel fiber and fully recycled coarse aggregate.

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references

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