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（1 合肥工業(yè)大學(xué)土木與水利工程學(xué)院， 合肥 230009； 2 安徽工程大學(xué)建筑工程學(xué)院， 蕪湖 241000；3 華匯工程設(shè)計(jì)集團(tuán)股份有限公司， 紹興 312000）

［摘要］為研究低周反復(fù)荷載作用下貫穿于再生混凝土節(jié)點(diǎn)的縱向鋼筋粘結(jié)性能，制作2榀再生混凝土框架中節(jié)點(diǎn)并進(jìn)行試驗(yàn)。通過在柱兩側(cè)梁端的縱筋上預(yù)埋應(yīng)變片，得到縱筋荷載-應(yīng)變滯回曲線。根據(jù)同一根縱筋上兩個(gè)測(cè)點(diǎn)應(yīng)變差來計(jì)算區(qū)段內(nèi)的平均粘結(jié)應(yīng)力，進(jìn)而獲得了加載過程中節(jié)點(diǎn)試件通裂階段、極限階段、破壞階段的縱筋相對(duì)粘結(jié)強(qiáng)度。試驗(yàn)結(jié)果表明，在試件通裂階段和極限階段，縱筋保有較為穩(wěn)定的粘結(jié)應(yīng)力，能夠滿足再生混凝土構(gòu)件鋼筋與混凝土之間通過粘結(jié)應(yīng)力傳遞應(yīng)力及協(xié)調(diào)變形的要求。粘結(jié)應(yīng)力分布與鋼筋直徑有關(guān)，鋼筋直徑越大粘結(jié)應(yīng)力退化越嚴(yán)重；柱側(cè)梁端截面受壓區(qū)混凝土達(dá)到極限壓應(yīng)變時(shí)，縱筋受壓強(qiáng)度不能得到充分發(fā)揮，受壓鋼筋應(yīng)力相對(duì)滯后。

［關(guān)鍵詞］低周反復(fù)荷載試驗(yàn)； 再生混凝土； 粘結(jié)性能； 中節(jié)點(diǎn)； 縱向鋼筋； 平均粘結(jié)應(yīng)力； 相對(duì)粘結(jié)強(qiáng)度

中圖分類號(hào)：TU375-4文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)21-0052-07

Experimental study on bond behavior of longitudinal reinforcements of recycled aggregate concrete beam-column joints under low-cyclic reversed loading

Fu Jiali1,2, Liu Bingkang1, Xiao Jingping3, Yao Feng1

(1 School of Civil and Water Conservancy Engineering, Hefei University of Technology, Hefei 230009, China; 2 School of Architecture and Civil Engineering, Anhui Polytechnic University, Wuhu 241000, China; 3 Huahui Engineering Design Group Co.,  Ltd.,  Shaoxing 312000, China)

Abstract:In order to study the bond behavior of longitudinal reinforcement throughout recycled concrete joints under low-cyclic reversed loading, two pieces of interior beam-column joint of recycled concrete frames were fabricated and tested. The load-strain hysteretic curve of the longitudinal steel bar was obtained by embedding the strain gauges on the longitudinal ribs at both ends of the column. According to the strain difference between the two measuring points of the same longitudinal reinforcement, the average bond stress in the section was calculated, and the relative strengths of the longitudinal bars in the crack propagation stage, the limit stage and the failure stage were obtained. The test results show that in the specimen crack stage and ultimate stage, longitudinal reinforcement maintains a relatively stable bond stress and can meet the requirement of transfer of stress and deformation coordination requirements through bond strength between steel and concrete of recycled concrete components. The bond stress distribution is related to the steel bar diameter, and the steel bar diameter is proportional to degradation of bond strength; when concrete in compression zone of beam end section at column side reaches the ultimate compressive strain, the longitudinal compressive strength of reinforced cannot be fully realized and compressive reinforcement stress is relatively lag.

Keywords:low-cyclic reversed loading test; recycled aggregate concrete; bond behavior; interior beam-column joint; longitudinal reinforcement; average bond stress; relative bond strength

*住房與城鄉(xiāng)建設(shè)部科學(xué)技術(shù)計(jì)劃資助項(xiàng)目（2013-K4-46），安徽省高等教育提升計(jì)劃省級(jí)自然科學(xué)研究一般項(xiàng)目(TSKJ2015B05)。

作者簡(jiǎn)介：付佳麗，博士，講師，Email:fjl@ahpu.edu.cn。