884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 淮陰工學(xué)院建筑工程學(xué)院， 淮安 223001； 2 南京工業(yè)大學(xué)土木工程學(xué)院， 南京 210009）

［摘要］為研究方鋼管與再生混凝土界面粘結(jié)滑移性能，以再生粗骨料取代率、再生混凝土強(qiáng)度等級(jí)及膨脹劑摻量為變化參數(shù)，進(jìn)行了方鋼管再生混凝土試件的推出試驗(yàn)，獲取了試件的荷載滑移曲線，分析了各變化參數(shù)對(duì)粘結(jié)強(qiáng)度的影響。在驗(yàn)證相關(guān)粘結(jié)強(qiáng)度計(jì)算模型適用性的基礎(chǔ)上，擬合出方鋼管再生混凝土的粘結(jié)強(qiáng)度計(jì)算公式。研究結(jié)果表明，方鋼管再生混凝土荷載滑移曲線具有相似性，均經(jīng)歷了四個(gè)階段，滑移首先出現(xiàn)在加載端，隨后發(fā)展到自由端；粘結(jié)強(qiáng)度隨再生粗骨料取代率增大而降低，但影響較小；粘結(jié)強(qiáng)度隨再生混凝土強(qiáng)度等級(jí)提高而增大，但增速趨緩；膨脹劑摻量對(duì)粘結(jié)強(qiáng)度影響明顯，粘結(jié)強(qiáng)度隨著膨脹劑摻量(0～15%范圍內(nèi))增加呈現(xiàn)出先增大后降低的趨勢(shì)。

［關(guān)鍵詞］方鋼管再生混凝土； 粘結(jié)滑移； 推出試驗(yàn)； 粘結(jié)強(qiáng)度

中圖分類號(hào)：TU392.3      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2015)08-0064-05

Experimental research on the interface bondslip behavior of recycled aggregate concrete\|filled square steel tube

Zhang Weidong1, Wang Zhenbo2, Sun Wenbin1, He Weizhong1, Gu Wenhu1

 (1 Faculty of Architecture and Civil Engineering， Huaiyin Institute of Technology， Huai′an 223001， China;

2 College of Civil Engineering, Nanjing University of Technology, Nanjing 210009, China)

Abstract:In order to study the interface bondslip behavior between square steel tube and recycled aggregate concrete（RAC）, pushout tests of recycled aggregate concretefilled square steel tube(RSST) were carried out considering three parameters including the replacement rate of recycled coarse aggregate, grade of RAC and mixing amount of expansive agent. The loadslip curves were obtained and the influences of three parameters on the bond strength were analyzed. Based on the applicability test of practical formulas of bond strength, the fitting bond strength formula of RSST was suggested. The results show that the whole process curves of loadslip are similar and can be divided into four stages as follows. The initial slip at loading end develops earlier than that at the free end. With the increase of replacement rate of recycled coarse aggregate, the bond strength decreases, but the effectis small. The bond strength of RSST increases with the increase of the RAC grade but the increasing speed of bond strength is becoming slower. The mixing amount of expansive agent has significant effect on the bond strength, and the bond strength is in decreasing trend after a steady increase with the mixing amount of expansive agent from 0 to 15%.

Keywords:recycled aggregate concretefilled square steel tube; bond slip; pushout test; bond strength

*住建部科學(xué)技術(shù)項(xiàng)目（2008k111），江蘇省教育廳自然科學(xué)基金項(xiàng)目（11KJD560003），江蘇省高校“青藍(lán)工程”優(yōu)秀骨干教師基金項(xiàng)目，淮陰工學(xué)院青年教師基金項(xiàng)目（491713329），固體廢棄物再生利用技術(shù)重點(diǎn)實(shí)驗(yàn)室基金項(xiàng)目（HAP201302）。

作者簡(jiǎn)介：張衛(wèi)東，碩士，講師，Email：jsntzwd@163.com。

                          參考文獻(xiàn)

［1］RDI K S，DOWLING P J. Bond structure in concrete filled steel tubes［R］. London:Imperial College，1975.

［2］TOMII M, YOSHIMURA K, MORISHITA Y. A method of improving bond strength  between steel tube and concrete core cast in square and octagonal steel tubular columns［J］. Transactions of Japan Concrete Institute, 1980（2）：327334.

［3］楊有福，韓林海.矩形鋼管自密實(shí)混凝土的鋼管混凝土界面粘結(jié)性能研究［J］.工業(yè)建筑，2006,36（11）:3236.

［4］陳宗平，徐金俊，薛建陽(yáng)，等.鋼管再生混凝土黏結(jié)滑移推出試驗(yàn)及黏結(jié)強(qiáng)度計(jì)算［J］.土木工程學(xué)報(bào)，2013,46（3）:4958.

［5］DBJ 1361—2004 鋼混凝土混合結(jié)構(gòu)技術(shù)規(guī)程［S］.福州：福建省建筑標(biāo)準(zhǔn)設(shè)計(jì)辦公室，2004.

［6］BS 54005∶2005 Steel concrete and composite bridgespart5:code of practice for the design of composite bridges［S］. London: British Standard Institute，2005.

［7］Recommendations for design and construction of concrete filled steel tubular structure［S］.Tokyo: Architectural Institute of Japan，1997.

［8］Eurocode4 Design of composite steel and concrete structurespart11:general rules and rules for buildings［S］. Brussels：European Committee for Standarisation， 1994.

［9］CEBFIP model code 1990: design code［S］.London： Committe EuroInternational Du Beton (CEB),1993.

［10］滑程耀.方鋼管混凝土界面粘結(jié)性能的試驗(yàn)研究與理論分析［D］.西安:西安建筑科技大學(xué)，2007.

［11］袁方．鋼管混凝土界面粘結(jié)滑移性能的試驗(yàn)研究［D］．上海：華東交通大學(xué)，2010