地震工程学报Issue(2)：612-618,7.DOI:10.3969/j.issn.1000-0844.2015.02.0612
均匀黏弹性地基中现浇 X 形桩低应变动测响应数值模拟
Numerical Simulation of Low Strain Dynamic Test Response for X-section Cast-in-place Concrete Pile on Homogeneous Viscoelastic Foundation
摘要
Abstract
A three dimensional finite model of an X-section cast-in-place concrete pile-soil system is established to simulate wave propagation in a low strain integrity X-section cast-in-place concrete pile (XCC pile).Velocity responses in the time domain at the top of the intact and defective piles are obtained.The velocity response characteristics of the intact pile are analyzed in addition to the velocity response curves of the defective piles.The results reveal that the velocity response at the top of the XCC pile during low strain integrity testing shows serious 3D effects,resulting in the peak value of the incident wave close to the pile center being largest,and the arrival time of the peak value of the incident wave close to the pile center being earliest.The farther a point is from the pile center,the more hysteretic is the peak of the arriving incident wave.The peak value of the incident waves first increases and then reduces from the pile center to the pile boundary.The inci-dent and reflected waves at different points along the ring direction at the top of the intact pile are very similar,but the disturbing waves of different points are not the same.The arrival time of the incident waves in the pile with variable modulus are the same as those in the intact pile,but the arrival time of the peak of the reflection wave at the bottom of the pile with variable modulus is later than that in the intact pile,and the peak value is smaller.The first defective reflected waves at different points along ring direction at the top of the defective XCC pile shows little differ-ences,but the second one shows larger differences.关键词
现浇 X 形桩/桩身缺陷/低应变检测/有限元法/三维效应Key words
X-section cast-in-place concrete pile/pile defects/low strain detection/finite element method/three-dimensional effect分类
建筑与水利引用本文复制引用
范玉明,丁选明,朱振生,付强..均匀黏弹性地基中现浇 X 形桩低应变动测响应数值模拟[J].地震工程学报,2015,(2):612-618,7.基金项目
国家自然科学基金高铁联合项目(No.U1134207) （No.U1134207）
新世纪优秀人才支持计划资助(NCET-12-0843) （NCET-12-0843）
国家自然科学基金项目(51378177) （51378177）
