短預(yù)應(yīng)力筋低回縮錨具變形及預(yù)應(yīng)力損失試驗(yàn)研究*
郭二偉1,2,3, 高晉棟3，唐偉明2
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(1 北京建工集團(tuán)有限責(zé)任公司博士后科研工作站， 北京 100055； 2 清華大學(xué)土木工程系， 北京 100084； 3 北京市建筑工程研究院有限責(zé)任公司， 北京 100039)［摘要］為研究短預(yù)應(yīng)力筋低回縮錨具變形及其預(yù)應(yīng)力損失計(jì)算問題，對2個相同的短鋼柱試件進(jìn)行施加不同預(yù)拉力的多次張拉加載試驗(yàn)，并測試張拉荷載和變形，分析錨具壓實(shí)變形、鋼柱壓縮變形、接縫變形和預(yù)應(yīng)力筋內(nèi)縮變形及各種變形之間的比例關(guān)系。結(jié)果表明：與采用夾片式錨具相比，采用低回縮錨具的短預(yù)應(yīng)力筋內(nèi)縮量可減小80%～90%，其值控制在1.0mm以內(nèi)，預(yù)應(yīng)力損失可減小56%～70%；在試驗(yàn)的基礎(chǔ)上，給出低回縮錨具預(yù)應(yīng)力損失計(jì)算公式。［關(guān)鍵詞］短預(yù)應(yīng)力筋; 低回縮; 錨具; 變形; 預(yù)應(yīng)力損失中圖分類號：TU757.2 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)10-0038-05Experimental study on deformation and pre-stress loss of short pre-stressed rebar with low retraction anchoragesGuo Erwei1,2,3， Gao Jindong3, Tang Weiming2(1 Post-doctoral Research Center, Beijing Construction Engineering Group Co., Ltd., Beijing 100055, China; 2 Department of Civil Engineering， Tsinghua University, Beijing 100084, China; 3 Beijing Building Construction Research Institute Co., Ltd., Beijing 100039, China)Abstract:In order to study the calculation problems of deformation and pre-stress loss of short pre-stressed rebar with low retraction anchorages, two same short steel column specimens were made to carried out repeated tensile loading test with different pre-stresses. The tensile load and deformation were measured. The compaction deformation of the anchorage, compression deformation of steel column, joint deformation, shrinkage deformation of pre-stressed rebar and various deformation ratios were analyzed. The results show that compared with the strand tapered anchorage, shrinkage deformation of short pre-stressed rebar with low shrinkage can be reduced by 80%～90% with controlled value within 1.0mm, and the pre-stress loss can be reduced by 56%～70%. Based on the test results, pre-stress loss calculation formula of low retraction anchorage was provided.Keywords:short pre-stressed rebar; low retraction; anchorage; deformation; pre-stress loss*北京市博士后工作經(jīng)費(fèi)資助項(xiàng)目(2014-ZZ-52)。作者簡介：郭二偉, 博士, 工程師，Email: guollwei@126.com。參考文獻(xiàn)［1］鄧?yán)誓? 姬帥, 張鵬,等. 預(yù)應(yīng)力碳纖維板夾片式錨具設(shè)計(jì)與試驗(yàn)研究［J］. 建筑結(jié)構(gòu), 2014,44(11):73-76，64.［2］潘立, 劉明保. 鋼絞線預(yù)應(yīng)力筋用齒合型單孔開口錨具的設(shè)計(jì)與試驗(yàn)研究［J］. 建筑結(jié)構(gòu)，2009,39(2):101-103.［3］馬林. DSM型預(yù)應(yīng)力鋼絞線低回縮張拉錨固體系設(shè)計(jì)與研制［J］. 鐵道標(biāo)準(zhǔn)設(shè)計(jì), 2008（2）:34-37.［4］梁棟, 方志, 孫志剛. 碳纖維筋夾片式錨具錨固性能的試驗(yàn)研究［J］. 建筑結(jié)構(gòu), 2007, 37(12):68-71.［5］邢軍. 短預(yù)應(yīng)力錨束低回縮量控制技術(shù)研究［D］. 長春：吉林大學(xué)，2013: 46-49.［6］彤輝. 二次張拉低回縮預(yù)應(yīng)力錨具及錨下應(yīng)力分析［D］. 長沙：湖南大學(xué)，2010: 41-51.［7］GB 50010—2010 混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國建筑工業(yè)出版社, 2011.［8］CECS 212∶2006 預(yù)應(yīng)力鋼結(jié)構(gòu)技術(shù)規(guī)程［S］. 北京: 中國計(jì)劃出版社, 2006.［9］JTG D62—2004 公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范［S］. 北京: 人民交通出版社, 2004.［10］JTG/T F50—2011 公路橋涵施工技術(shù)規(guī)范［S］. 北京: 人民交通出版社, 2011.
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