圆形和环形截面抗滑桩的非均布配筋计算方法

对大截面抗滑桩考虑非均布配筋可以大大降低配筋量。从受力特点、计算简便性以及布筋要求等方面对抗滑桩和其他定向受力桩作了定性对比分析。以《混凝土结构设计规范》(GB 50010-2002)中圆形与环形截面受弯构件配筋计算公式为基础,推导了圆形与环形截面抗滑桩120°夹角非均布配筋计算公式,进行了算例对比分析和经济配筋定量计算探讨。结果表明:计算方法是经济合理的;抗滑桩的总配筋量与构造配筋率近似成正比,构造配筋率取0.2%(预制桩为0.8%)时配筋最为经济。

Method for Computation of Non-uniform Distribution of Reinforcement of Slide-resistant Piles with Round or Annular Section

Non-uniform distribution of reinforcement for slide-resistant pile can greatly reduce the amount of the reinforcement.Qualitative comparison between slide-resistant pile and other laterally loaded piles are made in terms of loading characteristics,simplicity for calculation and requirement for reinforcement distribution,and improvement is made to the computation method for the non-uniform distribution of reinforcement of slide-resistant piles with round or annular section.Based on the calculating formulas for uniform distribution of reinforcement of flexural member with round or annular section,a set of calculation formulas for the non-uniform distribution are deduced.Comparative calculation is made with other relative methods and quantitative calculation is also made to explore the cost effective reinforcement.The results show that the method is economically efficient;and that the general reinforcement for the pile is approximately proportional to the structurally required reinforcement and the most cost effective reinforcement for the pile is to take the structural reinforcement rate as 0.2%(0.8% for precast pile).