中南大学学报（自然科学版）Issue(2)：548-557,10.DOI:10.11817/j.issn.1672-7207.2016.02.027
现浇X形桩低应变瞬态动测响应三维有限元分析
Three-dimensional finite element analysis on dynamic response of XCC pile in low strain integrity testing
摘要
Abstract
A three dimensional finite element model was established to simulate the wave propagation in low strain integrity testing of X-section concrete pile (XCC pile). The velocity responses in time and frequency domains at different points on top of pile were obtained. By comparing the velocity responses at different points on top of pile, the high-frequency waves were analyzed, as well as the effects of pulse length, outside circle diameter and elastic modulus of pile on the arrival time and peak value of incident wave peaks. The results show that the velocity response on top of XCC pile in low strain integrity testing shows serious 3D effect, resulting in different arrival time of incident wave peaks at different points along bulge direction. The peak value of the incident waves close to pile center is the largest. The incident wave is negative after the first peak, while the negative response disappears whenr>0.4R. The reflected waves from pile tip are almost the same. The high-frequency interference of XCC pile is different from solid circular piles. There are two kinds of interference frequencies on top of XCC pile. The arrival time of incident wave peaks and peak ratio of the incident and reflected waves are affected greatly by pulse length and outside circle diameter, but they are affected little by elastic modulus of pile. The influence of parameters is not obvious atr=0.4R in bulge direction on top of XCC pile.关键词
现浇X形混凝土桩/低应变检测/有限元法/三维效应/高频干扰Key words
X-section cast-in-place concrete pile/low strain dynamic testing/finite element method/three-dimensional effect/high-frequency interference分类
建筑与水利引用本文复制引用
范玉明,丁选明,栾鲁宝,周仕礼..现浇X形桩低应变瞬态动测响应三维有限元分析[J].中南大学学报（自然科学版）,2016,(2):548-557,10.基金项目
国家自然科学基金高铁联合基金重点资助项目(U1134207)；新世纪优秀人才支持计划项目(NCET-12-0843)；国家自然科学基金资助项目(51378177,51420105013)(Project (U1134207) supported by the National Natural Science Joint High Speed Railway Key Program Foundation of China （U1134207）
Project (NCET-12-0843) supported by the Program for New Century Excellent Talents in University （NCET-12-0843）
Projects (51378177,51420105013) supported by the National Natural Science Foundation of China) （51378177,51420105013）
