短预应力筋低回缩锚具变形及预应力损失试验研究*
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(1 北京建工集团有限责任公司博士后科研工作站， 北京 100055； 2 清华大学土木工程系， 北京 100084； 3 北京市建筑工程研究院有限责任公司， 北京 100039)［摘要］为研究短预应力筋低回缩锚具变形及其预应力损失计算问题，对2个相同的短钢柱试件进行施加不同预拉力的多次张拉加载试验，并测试张拉荷载和变形，分析锚具压实变形、钢柱压缩变形、接缝变形和预应力筋内缩变形及各种变形之间的比例关系。结果表明：与采用夹片式锚具相比，采用低回缩锚具的短预应力筋内缩量可减小80%～90%，其值控制在1.0mm以内，预应力损失可减小56%～70%；在试验的基础上，给出低回缩锚具预应力损失计算公式。［关键词］短预应力筋; 低回缩; 锚具; 变形; 预应力损失中图分类号：TU757.2 文献标识码：A 文章编号：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*北京市博士后工作经费资助项目(2014-ZZ-52)。作者简介：郭二伟, 博士, 工程师，Email: guollwei@126.com。参考文献［1］邓朗妮, 姬帅, 张鹏,等. 预应力碳纤维板夹片式锚具设计与试验研究［J］. 建筑结构, 2014,44(11):73-76，64.［2］潘立, 刘明保. 钢绞线预应力筋用齿合型单孔开口锚具的设计与试验研究［J］. 建筑结构，2009,39(2):101-103.［3］马林. DSM型预应力钢绞线低回缩张拉锚固体系设计与研制［J］. 铁道标准设计, 2008（2）:34-37.［4］梁栋, 方志, 孙志刚. 碳纤维筋夹片式锚具锚固性能的试验研究［J］. 建筑结构, 2007, 37(12):68-71.［5］邢军. 短预应力锚束低回缩量控制技术研究［D］. 长春：吉林大学，2013: 46-49.［6］彤辉. 二次张拉低回缩预应力锚具及锚下应力分析［D］. 长沙：湖南大学，2010: 41-51.［7］GB 50010—2010 混凝土结构设计规范［S］. 北京: 中国建筑工业出版社, 2011.［8］CECS 212∶2006 预应力钢结构技术规程［S］. 北京: 中国计划出版社, 2006.［9］JTG D62—2004 公路钢筋混凝土及预应力混凝土桥涵设计规范［S］. 北京: 人民交通出版社, 2004.［10］JTG/T F50—2011 公路桥涵施工技术规范［S］. 北京: 人民交通出版社, 2011.
