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（上海市建筑科學(xué)研究院上海市工程結(jié)構(gòu)安全重點(diǎn)實(shí)驗(yàn)室， 上海 200032）

［摘要］鋼筋套筒灌漿連接是裝配整體式混凝土結(jié)構(gòu)的核心，對(duì)結(jié)構(gòu)整體性能至關(guān)重要。針對(duì)適應(yīng)14，20，25mm三種直徑的鋼筋套筒灌漿連接接頭GTZQ4-14，GTZQ4-20，GTZQ4-25，通過(guò)在套筒內(nèi)下段鋼筋錨固段底部設(shè)置灌漿缺陷，研究了不同大小的缺陷對(duì)接頭對(duì)中單向拉伸強(qiáng)度的影響。研究結(jié)果表明，對(duì)于常用型號(hào)灌漿套筒，當(dāng)套筒端頭灌漿缺陷長(zhǎng)度不超過(guò)套筒內(nèi)一側(cè)鋼筋錨固長(zhǎng)度（8d）的30%時(shí)，其接頭的對(duì)中單向拉伸強(qiáng)度仍能符合要求。研究結(jié)果可為套筒灌漿質(zhì)量檢測(cè)評(píng)估和后續(xù)整治提供依據(jù)。

［關(guān)鍵詞］鋼筋套筒灌漿連接； 灌漿缺陷； 強(qiáng)度； 破壞形態(tài)

中圖分類(lèi)號(hào)：TU758-14文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)07-0052-05

Experimental study on influence of grouting defect on joint strength of grout sleeve splicing of rebars

Li Xiangmin, Gao Rundong, Xu Qingfeng, Wang Zhuolin, Zhang Fuwen

(Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences, Shanghai 200032, China)

Abstract:Grout sleeve splicing of rebars is the core of monolithic precast concrete structure, which is quite important to the integrated performance of structure. For rebars′ grout sleeve splicing joints of GTZQ4-14, GTZQ4-20 and GTZQ4-25 which adapt to three kinds of rebar diameter of 14mm, 20mm and 25mm, the grouting defects were set at the bottom of anchor segment of the lower rebar in the sleeve, and the influences of different size of defects on the centered uniaxial tensile strength of joint were studied. Results indicate that for common type of grout sleeves, when the grouting defect length is not more than 30% of the any side rebar anchor length (8d) in the sleeve, the centered uniaxial tensile strength of joint still meets the standard requirement. The research achievement can be used to evaluate the testing result of sleeve grouting quality, and further provides the basis for whether or not the grouting defect need to be treated.

Keywords:grout sleeve splicing of rebars; grouting defect; strength; failure mode

*上海市科委課題（16DZ1201805）。

作者簡(jiǎn)介：李向民，博士，教授級(jí)高級(jí)工程師，Email: 13601902634@163.com。