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(1 山東建筑大學(xué)土木工程學(xué)院, 濟(jì)南 250101;2 山東建筑大學(xué)建筑結(jié)構(gòu)加固改造與地下空間工程教育部重點(diǎn)實(shí)驗(yàn)室, 濟(jì)南 250101)

摘要: 為研究再生混凝土 T 形梁的抗剪性能,以再生骨料取代率、鋼纖維體積率、配箍率和剪跨比為參數(shù)設(shè)計(jì)了 5個(gè)再生混凝土 T 形梁. 通過單調(diào)加載試驗(yàn),對(duì)再生混凝土 T 形梁的破壞特征、承載力、變形能力以及鋼筋應(yīng)變結(jié)果進(jìn)行了研究,并基于現(xiàn)有規(guī)范和試驗(yàn)數(shù)據(jù)對(duì)各試件的峰值承載力計(jì)算方法進(jìn)行了研究. 結(jié)果表明,梁的抗剪承載力受再生粗骨料的影響較小,但再生粗骨料的使用會(huì)降低梁的剛度及變形能力,使梁的剪切脆性破壞特征更為明顯;摻加鋼纖維或增大配箍率均可以提高梁的承載力和變形能力,有效改善再生混凝土梁的剪切脆性破壞情況;試件的承載能力隨剪跨比的減小而增大,但其變形能力隨之降低;修正方法得到的抗剪承載力計(jì)算值與試驗(yàn)值相比誤差較小,可為再生混凝土梁的抗剪設(shè)計(jì)提供參考.

關(guān)鍵詞: 再生混凝土梁; 鋼纖維; 抗剪性能; 抗剪承載力計(jì)算

中圖分類號(hào):TU375. 1,TU317+. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

∗北京工業(yè)大學(xué)教育部重點(diǎn)實(shí)驗(yàn)室校外開放課題(2020B03) .

第一作者:劉春陽,博士,副教授,碩士生導(dǎo)師,主要從事混凝土結(jié)構(gòu)抗震方面的研究工作,Email:liucy2011@ sdjzu. edu. cn.

[引用本文] 劉春陽,于桂欣,高英棋,等. 鋼纖維再生混凝土 T 形梁抗剪性能試驗(yàn)研究[ J] . 建筑結(jié)構(gòu),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.