基于拉压杆模型理论方法的桩基承台受力特性研究  

Research on Force Characteristics of Pile Foundation Bearing Platforms Based on Tension and Compression Rod Model Theory

作　　者：刘义 LIU Yi(The Sixth Engineering Co.,Ltd.,China Railway 19th Bureau Group,Wuxi 214028,China)

机构地区：[1]中铁十九局集团第六工程有限公司,无锡214028

出　　处：《成都航空职业技术学院学报》2024年第2期60-65,共6页Journal of Chengdu Aeronautic Polytechnic

摘　　要：为了研究多桩基承台在直接荷载作用下的拉压杆模型分析模式,与传统拉压杆模型相比,考虑了飞边比对阻力的影响。首先介绍了两种拉压杆模型(MBT-1/MBT-2)的理论方法及计算公式;然后在混凝土块冲切分析的基础上设计了冲切试验,并进行了4组24个试件的冲切试验,依次对比了冲切试验荷载记录值与Gutiérrez R提出的理论公式值以及改进公式;基于拉压杆模型提出了多桩基承台的冲切公式,调整了表征承台内桩基桩帽失效的参数。研究表明,原有Gutiérrez R提出的拉压杆模型公式与试验值存在一定的误差范围,而改进后的拉压杆模型公式与试验值有较好的匹配度;此研究方法可在原简单多桩基承台设计的基础上进行了扩展,并将其应用于复杂荷载作用下多桩基承台设计当中。To study the analysis mode of the tension and compression rod model of multi-pile foundation caps under direct load,the traditional tension and compression rod model takes into account the influence of flash ratio on resistance.This paper first intro-duces the theoretical methods and calculation formulas of two kinds of tensile and compression bar models(MBT-1/MBT-2)and then designs the punching test based on the punching analysis of concrete blocks.The punching test of four groups of 24 specimens is carried out,and the recorded value of the punching test load is compared with the theoretical formula value proposed by Gutierrez R and the improved formula.The results show that there is a certain error range between the original model formula of tension and com-pression bar proposed by Gutierrez R and the test value,and the improved model formula of tension and compression bar has a good match with the test value.The punching formula of a rock-socketed end cap pile is proposed based on the model of tension and com-pression rod,and the parameters characterizing the failure of a rock-socketed end cap pile are adjusted.The aim is to present a simple design scheme of rock-socketed end piles,which can be extended to more complex rock-socketed end piles.

关 键 词：拉压杆模型 冲切 桩基 理论公式 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]