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《Rock and Soil Mechanics》 2012-08
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Working stress measurement of prestressed anchor cables:Detection mechanism and experimental study of lift-off test

FU Dan1,2,GUO Hong-xian1,CHENG Xiao-hui1,LUO Bin3,RAO Xiao-yu3(1.Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education Department of Civil Engineering,Tsinghua University,Beijing 100084,China;2.China Northeast Architectural Design & Research Institute Co.,Ltd.,Shenyang 110006,China; 3.Chongqing Communications Research and Design Institute,Chongqing 400067,China)  
The prestressed anchor cables are critical structural elements in ground anchors.Because of the widespread use of ground anchors in geotechnical engineering,the measurement of working stress of prestressed anchor cables in ground anchors becomes imperative.The lift-off test is currently practiced in China and many other countries for this purpose.However,the interpretation methods of testing results are different and country dependent.The interpretation method employed in China is examined by experiment and theoretical analysis that are presented in this paper.The experimental verifications are performed to apply a couple of lift-off tests on a anchor cable prestressed to its 75% ultimate strength.The results show that averaged load in the bending regime on the load-displacement curve recorded during lift-off tests can approximate the working stress of this anchor cable monitored with load cells installed.According to theoretical analysis the measuring principle of list-off tests is better understood.
【Fund】: 交通部西部交通建设科技项目(No.200831800001)
【CateGory Index】: TU472
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