体外束锚下张拉力反张法测试机理及应用  

Study on Testing Mechanism and Application of Tension under Anchor for External Prestressing Strand by Reverse Tension Method

作　　者：郭文龙 单成林[3] 梁鹏[1] GUO Wenlong;SHAN Chenglin;LIANG Peng(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Shanxi Key Laboratory of Bridge Engineering Disaster Prevention and Mitigation,Shanxi Transportation Technology Research & Development Co.,Ltd,Taiyuan 030032,Shanxi,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]山西省交通科技研发有限公司桥梁工程防灾减灾山西省重点实验室,山西太原030032 [3]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2020年第11期10-18,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家重点研发计划项目(2018YFB1600300);国家自然科学基金项目(51878059);中央高校基本科研业务费创新团队培育项目(300102218406);山西省自然科学基金资助项目(201801D121165,201801D221216,201801D221217,201701D221131);山西省交通科技计划项目(2013-01-06,2016-01-22)。

摘　　要：为解决钢绞线锚下有效张拉力缺乏可靠随机抽检方法的问题,从力学平衡和变形协调条件出发,推导了反张法检测单根钢绞线锚下张拉力的力学机理,分析了其最不利条件下的理论测试误差,指出了该方法的适用条件。最后结合常用施工机具和设备,提出了一种非常实用的测试方法和系统组成,并在室内静载锚固试验机上进行了验证。试验结果表明:采用该方法测试钢绞线锚下张拉力时,夹片与锚具拉脱临界时刻前后不同参数曲线的敏感性依次是:力-位移曲线>力时程曲线>位移时程曲线,该方法的测试精度能够满足工程精度要求。In view of the lack of reliable testing methods for the effective tension of end anchor of external prestressed strand,the mechanical mechanism of testing the tension of end anchor by the reverse tension method was revealed based on the mechanical mechanism of mechanical equilibrium and deformation coordination.And the theoretical testing error under the most unfavorable conditions was analyzed,and the applicable conditions of the method were pointed out.Finally,based on the most commonly used construction machines and equipment in the construction site,a practical test method and system composition were put forward and verified on the indoor static load anchorage test machine.The test results show that the sensitivity of different parameter curves in judging tension force under strand anchor is:force-displacement curve>force-time curve>displacement-time curve.The test accuracy of the proposed method can meet the requirements of engineering accuracy.

关 键 词：桥梁工程 体外预应力 张拉力 反张法 机理 实用测试方法 

分 类 号：TU375.4[建筑科学—结构工程]