(1 山东建筑大学土木工程学院, 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, 济南 250101)

摘要: 为研究再生混凝土 T 形梁的抗剪性能,以再生骨料取代率、钢纤维体积率、配箍率和剪跨比为参数设计了 5个再生混凝土 T 形梁. 通过单调加载试验,对再生混凝土 T 形梁的破坏特征、承载力、变形能力以及钢筋应变结果进行了研究,并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. 结果表明,梁的抗剪承载力受再生粗骨料的影响较小,但再生粗骨料的使用会降低梁的刚度及变形能力,使梁的剪切脆性破坏特征更为明显;掺加钢纤维或增大配箍率均可以提高梁的承载力和变形能力,有效改善再生混凝土梁的剪切脆性破坏情况;试件的承载能力随剪跨比的减小而增大,但其变形能力随之降低;修正方法得到的抗剪承载力计算值与试验值相比误差较小,可为再生混凝土梁的抗剪设计提供参考.

关键词: 再生混凝土梁; 钢纤维; 抗剪性能; 抗剪承载力计算

中图分类号:TU375. 1,TU317+. 1 文献标志码:A 文章编号:1002-848X(2022)03-0007-06

DOI:10. 19701 / j. jzjg. 20210261

Experimental study on shear performance of steel fiber reinforced recycled concreteT-shaped beams

LIU Chunyang1,2, YU Guixin1, GAO Yingqi1, GU Yifan1, WU Yangyang1

(1 Department of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China;2 Key Laboratory of Building Structural Retrofitting and Underground Space Engineering ( Shandong Jianzhu University) ,Ministry of Education, Jinan 250101, China)

Abstract: In order to study the shear performance of reinforced recycled concrete T-shaped beams, five recycled concreteT-shaped beams were designed with the parameters of recycled aggregate replacement rate, steel fiber volume rate, stirruprate and shear span ratio. Through the monotonic loading test, the failure characteristics, bearing capacity, deformationcapacity and steel strain results of recycled concrete T-shaped beams were studied, and the peak bearing capacitycalculation method of each specimen was studied based on the existing specifications and test data. The results show thatthe shear resistance of the beam is less affected by recycled coarse aggregate, but the use of recycled coarse aggregate willreduce the stiffness and deformation capacity of the beam, making the shear brittle failure characteristics of the beam moreobvious. Adding steel fiber or increasing the hoop ratio can improve the bearing capacity and deformation capacity of thebeam, and effectively improve the shear brittle failure of recycled concrete beams. Reducing the shear span cansignificantly increase the load-bearing capacity of the specimen, but its deformation capacity decreases accordingly.Compared with the experimental value, the calculated value of the shear capacity obtained by the correction method has asmaller error, which can provide a reference for the shear design of recycled concrete beams.

Keywords:recycled concrete beam; steel fiber; shear performance; shear capacity calculation

∗北京工业大学教育部重点实验室校外开放课题(2020B03) .

第一作者:刘春阳,博士,副教授,硕士生导师,主要从事混凝土结构抗震方面的研究工作,Email:liucy2011@ sdjzu. edu. cn.

[引用本文] 刘春阳,于桂欣,高英棋,等. 钢纤维再生混凝土 T 形梁抗剪性能试验研究[ J] . 建筑结构,2022,52(3) : 7-12, 18. LIU Chunyang,YU Guixin,GAO Yingqi, et al. Experimental study on shear performance of steel fiberreinforced recycled concrete T-shaped beams[ J] . Building Structure,2022,52(3) :7-12,18.