摘要
国内外关于抗拔桩的研究主要集中在抗拔桩的承载力方面,而对变形特性研究相对较少。本文根据不同场地的三根抗拔工程桩荷载-位移曲线,绘制"荷载-位移梯度"曲线,发现钢筋混凝土抗拔桩也像水平受荷桩一样存在临界荷载,预应力及混凝土的受拉性能对抗拔桩的受力变形有重要影响。基于混凝土受拉"应力-应变"关系,推导得出钢筋混凝土"受拉模量与应变"的关系,用MATLAB语言编制考虑桩身模量变化的抗拔桩荷载传递分析程序,参数分析表明混凝土标号和配筋率对抗拔桩受力变形有较大影响,考虑钢筋混凝土受拉特性时,抗拔桩的荷载-位移曲线模拟结果与实测更为接近。
Research on uplift piles mainly focuses on the bearing capacity of the uplift piles in the world,while on the deformation characteristics is relatively less. Based on the measured uplift load-displacement curves of three piles in different sites,and the plotted uplift load-displacement gradient curves,it's found that there also exists the critical load in concrete uplift piles as in laterally loaded piles. It's also found that the concrete tensile property and prestressing force have significant influences on deformation of the uplift piles. According to the concrete tensile stress-strain relationship,the relationship of pile body modulus and the strain is constructed,and by MATLAB language,the load transfer analysis procedures is made,taking account of pile body modulus variation. Parameter analysis indicates that the concrete grade and reinforcement ratio have influence on deformation of the uplift piles. It's also found that the simulated load-displacement curve of uplift pile with consideration of tensile properties of concrete is much closer to the measured data.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第S1期65-69,共5页
Chinese Journal of Underground Space and Engineering
关键词
抗拔桩
临界荷载
预应力桩
荷载传递法
受拉模量
uplift pile
critical load
prestressing pile
load transfer method
tensile modulus
