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| APPLICATION OF FIBER BRAGG GRATING SENSOR TO LATERAL LOAD TESTS OF PHC PIPE PILES |
| QIU Rendong1，GAO Wensheng1，SUN Junjie2，QIU Mingbing1，WAN Zheng1，
GUO Jinxue1，HOU Yuefeng3，YIN Rui1 |
(1. Institute of Foundation Engineering，China Academy of Building Research，Beijing 100013，China；2. Lanzhou Institute of Seismology，China Earthquake Administration，Lanzhou，Gansu 730000，China；3. Institute of Mechanics，
Chinese Academy of Sciences，Beijing 100080，China) |
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Abstract Fiber Bragg grating(FBG) sensor has been widely applied to different engineering tests due to its superiority of basic principle and usability. However，it is difficult to adopt FBG sensor on the load tests of PHC pipe pile because the relative research results and practical knowledge in the case of PHC pipe pile are still lack. Based on the analysis of operational principle and hardware features of FBG sensor，embedding methods of FBG sensors for PHC pipe pile through one field test of lateral loading on this kind of pile are carefully investigated. During the embedding process，the specials acquirements within product and piling of PHC pipe pile are adequately considered. The practical results show that the survival ratio of FBG sensors could reach 100% according to the embedding scheme and technique proposed by the author，while the PHC pipe pile is operated by the both ways of hammering and static pressure. Meanwhile，the test data of lateral load of PHC pipe pile by means of FBG sensors reveal their qualities of precision，zero drift and stability are better than those obtained by traditional electric resistance wire strain gauges. The further comparative analysis of different internal force distributions in the body of PHC pipe pile，which are respectively received by the field test and theoretical computation method proposed by Technical code for building pile foundation(JGJ 94——2008)，discloses that the computation method in the code could reflect the practical situation of internal force behaviours of pile under lateral loading. The practical results and comprehensive analysis reported by authors indicate that FBG sensor is a better suitable kind of technique to monitor internal strain behaviors of precast concrete piles under lateral loads.
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Received: 08 January 2013
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2013, Vol. 32 
