FBG传感器在PHC管桩水平载荷试验中的应用

介绍了FBG传感器的优点,并说明了FBG传感器在PHC管桩中的安装工艺.结合实际工程,依据PHC管桩水平静载荷试验的监测结果,分析了PHC管桩桩身内力与变形的分布规律:在地面处,桩身弯矩接近于零,随着深度的增加,桩身弯矩呈现先增加后减小的趋势,其最大值在地面以下(1/12~1/6)桩长范围内发生,其弯曲变形主要发生在桩体上部1/3桩长范围,而距地面1/3桩长以下桩体几乎不发生弯曲变形;桩身挠度随深度的增加逐渐减小,最终减至零;水平荷载对桩身弯矩及挠度均有显著的影响.通过实验数据与理论计算结果的对比,可知FBG传感器测试数据精确、可靠,可较好的应用于PHC管桩的水平静载荷试验.

Application of FBG Sensing Technology in Lateral LoadTests on PHC Pipe Piles

The advantage of the FBG sensor was introduced and the FBG sensors installation process in PHC pipe piles was also proposed.Combined with practical engineering,according to the monitoring results of PHC pipe pile lateral static load tests horizontal,PHC pipe pile body force and deformation was analysed after data processing:On the ground,pile bending moment was closed to zero.With the increase of depth,bending showed a trend of decrease after the first increase,and the maximum was (1/12~1/6) pile under the ground.The bending deformation was mainly distributed in the pile length above 1/3 pile,and almost no deformation in the pile body below 1/3 pile;the deflection of the pile body decreases with increasing depth,and it was ultimately closed to zero;the horizontal load has significant impact on deflection of the pile body.Through comparing the experimental data with the theoretical calculation result,the testing data from the FBG sensor is reliable and could be better applied to the PHC pile lateral static load test.