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（1 延安大學(xué)建筑工程學(xué)院， 延安 716000； 2 中交第一公路勘察設(shè)計(jì)研究院有限公司， 西安 710075； 3 西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）

［摘要］為研究植筋加固混凝土界面的荷載傳遞機(jī)理，通過(guò)對(duì)設(shè)計(jì)制作的1:1單元實(shí)體模型進(jìn)行單向循環(huán)荷載試驗(yàn)，結(jié)合試驗(yàn)條件建立了ABAQUS有限元分析模型，主要探討植筋混凝土界面在荷載作用下的破壞模式、界面剪切承載力、應(yīng)力分布及試件變形特征。研究結(jié)果表明：植筋混凝土界面為結(jié)構(gòu)受力薄弱面，荷載作用下其破壞模式以劈裂型剪切破壞為主；植筋混凝土界面剪切承載力較高，可達(dá)9-208×103kN/m2；植筋應(yīng)力在混凝土界面處達(dá)到最大，向兩側(cè)逐漸減??；界面剪力荷載起先由混凝土和植筋共同承擔(dān)，隨著荷載增大，界面剪切荷載大于混凝土粘結(jié)承載力后混凝土的界面粘結(jié)作用消失，其后主要由植筋和混凝土界面摩擦力承擔(dān)剪切荷載；植筋構(gòu)造能夠大幅提升混凝土界面剪切荷載的傳遞效率。

［關(guān)鍵詞］植筋； 混凝土界面； 數(shù)值分析； 荷載試驗(yàn)； 剪切承載力

中圖分類號(hào)：TU528文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)15-0104-06

Experiment and numerical simulation of shear performance of concrete interface for bonded rebars

Cheng Maili1,3, Zhang Li2,3, Li Qingning3

(1 School of Architecture and Civil Engineering, Yan′an University, Yan′an 716000, China;2 China Communications Construction Company First Highway Consultants Company, Xi′an 710075, China;3 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)

Abstract:In order to study the load transfer mechanism of reinforced concrete interface for bonded rebars, ABAQUS finite element analysis model was established by unidirectional cyclic loading test on the 1:1 solid model which was designed and manufactured. The failure mode, shear capacity, stress distribution and deformation characteristics of the reinforced concrete interface under load were mainly discussed. The results show that the reinforced concrete interface for bonded rebars is the weak surface of structure, and the main failure mode under load is splitting shear failure; the shear bearing capacity of reinforced concrete interface is high, up to 9-208×103kN/m2; the planting stress reaches the maximum at the interface of concrete and decreases gradually to both sides; the shear load of interface is initially borne by both concrete and bonded rebars, with the increase of load. When the interfacial shear load is larger than the concrete bond bearing capacity, the interfacial bond of concrete disappears, and then the interfacial friction between the bonded rebars and the concrete bears the shear load. The bonded rebar structure can greatly improve the transmission efficiency of the interfacial shear load of concrete.

Keywords:bonded rebar; concrete interface; numerical analysis; loading test; shear capacity

*國(guó)家自然科學(xué)基金項(xiàng)目（51808479），陜西省教育廳專項(xiàng)科研項(xiàng)目（17JK0859），陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃資助項(xiàng)目（2018JQ5217），延安大學(xué)博士科研啟動(dòng)項(xiàng)目（YDBK2016-08），延安大學(xué)科研計(jì)劃項(xiàng)目（YDY2017-11）。

作者簡(jiǎn)介：程麥理，博士，副教授， Email:cml3635@163.com。