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(1 杭州都市高速公路有限公司， 杭州 310012；2 浙江大學(xué)結(jié)構(gòu)工程研究所， 杭州 310058)

摘要: 混凝土結(jié)合界面是裝配式混凝土結(jié)構(gòu)的薄弱環(huán)節(jié)，套筒灌漿連接混凝土結(jié)合界面直剪性能對(duì)裝配式混凝土結(jié)構(gòu)安全性能至關(guān)重要。 設(shè)計(jì)試驗(yàn)研究了鋼筋銹蝕對(duì)直剪荷載作用下套筒灌漿連接混凝土結(jié)合界面的裂縫開展、破壞形態(tài)、裂縫寬度￣豎向相對(duì)滑移關(guān)系以及名義剪應(yīng)力￣豎向相對(duì)滑移關(guān)系的影響，并通過理論分析研究了鋼筋銹蝕對(duì)結(jié)合界面剪應(yīng)力￣豎向相對(duì)滑移曲線特征參數(shù)與特征系數(shù)的影響。 研究結(jié)果表明:鋼筋銹蝕的發(fā)展對(duì)結(jié)合界面直剪加載過程中的裂縫發(fā)展剛度具有兩個(gè)階段影響，在加載初期，隨銹蝕率增長(zhǎng)，裂縫發(fā)展剛度下降；而在加載后期，隨銹蝕率增長(zhǎng)，裂縫發(fā)展剛度上升。 鋼筋銹蝕會(huì)顯著降低套筒灌漿混凝土結(jié)合界面的極限剪應(yīng)力和殘余剪應(yīng)力，當(dāng)鋼筋銹蝕率為 3. 5%和 7. 5%時(shí)，結(jié)合界面的極限剪應(yīng)力分別下降 41%和 49%，殘余剪應(yīng)力分別下降約35%和 59%。

關(guān)鍵詞: 套筒灌漿；混凝土結(jié)合界面；銹蝕鋼筋；直剪性能；裝配式混凝土結(jié)構(gòu)

中圖分類號(hào):TU375. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002￣848X(2022)01￣0120￣07

DOI:10. 19701 / j. jzjg. 20200265

Experimental study on direct shear performance with corroded steel bar of connectionsurface of sleeve grouting in prefabricated structure

ZHANG Xuefeng1， LI Piwei1， XIA Jin2， GAN Runli2， JIN Weiliang2

(1 Hangzhou Urban Highway Co.， Ltd.， Hangzhou 310012， China；2 Institute of Structural Engineering， Zhejiang University， Hangzhou 310058， China)

Abstract: The concrete interface is the weak link of the precast concrete structures. The direct shear performance of thesleeve grouting concrete interface is significant importance to the safety of the precast concrete structures. The influence ofsteel bar corrosion on the crack development， failure pattern， relationship of crack width and vertical relative slip，relationship of nominal shear stress and vertical relative slip were examined by the experimental study on the sleeve groutingconcrete interface with corroded steel bar under the direct shear load. Meanwhile， the influence of steel bar corrosion on thecharacteristic parameters and coefficients of the shear stress￣vertical relative slip curve was analyzed theoretically. Theresearch results show that the development of steel bar corrosion has two￣stage influences on the crack development stiffnessof interface during the direct shear loading. At the beginning of loading， the crack development stiffness decreases with theincrease of corrosion ratio. However， at the later stage of loading， the crack development stiffness increases with theincrease of corrosion ratio. The ultimate shear stress and residual shear stress of the sleeve grouting concrete interface willbe significantly reduced by the steel bar corrosion. When the corrosion ratio of the reinforcing steel bar is 3. 5% and 7. 5%，the ultimate shear strength of interface would decrease by 41% and 49% respectively， and the residual shear stress woulddecrease by about 35% and 59% respectively.

Keywords:sleeve grouting；concrete interface；corroded steel bar；direct shear performance；precast concrete structure

∗國(guó)家 自 然 科 學(xué) 基 金 項(xiàng) 目 ( 51778566)， 浙 江 省 杰 出 青 年 科 學(xué) 基 金 項(xiàng) 目 ( LR21E080003 )， 國(guó) 家 重 點(diǎn) 研 發(fā) 計(jì) 劃 項(xiàng) 目(2016YFC0701406)，浙江省交通投資集團(tuán)有限公司科技項(xiàng)目(201812)，浙江省自然科學(xué)基金重點(diǎn)項(xiàng)目(LZ16E080002)，中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)(2018FZA4018)。

第一作者:張雪鋒，學(xué)士，正高級(jí)工程師，主要從事高速公路建設(shè)營(yíng)運(yùn)管理工作，Email:171383279@ qq. com。

[引用本文] 張雪鋒，李丕偉，夏晉，等. 銹蝕鋼筋套筒灌漿連接混凝土結(jié)合界面直剪性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu)，2022，52(1):120￣126. ZHANG Xuefeng，LI Piwei， XIA Jin，et al. Experimental study on direct shear performancewith corroded steel bar of connection surface of sleeve grouting in prefabricated structure[J]. Building Structure，2022，52(1):120￣126.