文章摘要
唐文栋,刘晓钊.考虑桩身自重影响的超长桩屈曲分析[J].安徽建筑大学学报,2016,24(6):39-42
考虑桩身自重影响的超长桩屈曲分析
Buckling analysis for super-long pile considering self-weight of pile
  
DOI:10.11921/j.issn.2095-8382.20160609
中文关键词: 屈曲分析  超长桩  临界荷载  瑞利-里兹法  桩身自重
英文关键词: buckling analysis  super-long pile  buckling load  the method of Rayleigh-Ritz  self-weight of pile
基金项目:
作者单位
唐文栋 安徽省建筑科学研究设计院安徽 合肥 230041 
刘晓钊 江苏大学 土木工程与力学学院江苏 镇江 212013 
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中文摘要:
      由于超长桩的桩身自重较大,其对超长桩稳定性有重要影响。已有的研究大多只考虑桩侧土抗力的影响,能同时考虑桩侧土抗力和桩身自重两个影响因素的超长桩屈曲荷载计算公式目前还很少报道。本文同时考虑桩侧土抗力和桩身自重的影响,通过选择合适的桩身挠曲变形函数及桩侧土弹性抗力模式,基于能量法给出了顶部有集中荷载、部分埋置于Winkler地基中超长桩的屈曲荷载和计算长度的解析表达。最后分析了桩侧土抗力和桩身自重对屈曲荷载的影响。结果表明桩侧土抗力是影响屈曲荷载的主要因素。当桩身埋置率(h/L)较低时,桩身自重对屈曲荷载的影响不容忽视;但随埋置率的增加,桩身自重对屈曲荷载的影响甚微。
英文摘要:
      Buckling analysis of super-long pile is an important subject. Due to the super-long pile’s large self-weight, the stability of the super-long pile has been greatly influenced. Most of the existing research only consider the influence of lateral resistance of soil on the buckling load, while the calculation of buckling load for long pile, with considering both factors of lateral resistance of soil and self-weight of pile has been rarely reported. In this paper, the influence of both factors have been taken into consideration. The analytical solutions for the buckling load and the calculation length of super-long pile are given by choosing the proper deflection function of pile, the elastic resistance model of lateral soil and the buckling load which is obtained with the method of Rayleigh-Ritz. Finally, this paper has analyzed the influences of lateral resistance of soil and the self-weight of pile on the buckling load and the calculation length of super-long pile. The result shows that the lateral resistance of soil mainly influences the buckling load. When the ratio of the depth to the length of pile (h/L) is at a low level, the influences of the self-weight of pile on the buckling load must be considered. With the increase in the value of this ratio, the influence of self-weight of pile gradually decreases to the yield load.
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