水平循环荷载作用下FRPC组合桩基本特性研究

项目名称： 水平循环荷载作用下FRPC组合桩基本特性研究

项目编号： No.51478109

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 龚维明

作者单位： 东南大学

项目金额： 88万元

中文摘要： 传统材料桩（钢、混凝土、木）在滨海腐蚀环境中耐久性问题突出，服役过程中需要昂贵的加固和修复费用，具有较高的全寿命成本。FRP管混凝土组合桩（简称FRPC桩）是由FRP外壳和其内部充填混凝土形成的一种新颖组合桩基础，具有良好的抗物理化学侵蚀、轻质高强等优点。目前国内外对其承载特性研究偏少，尤其是水平循环荷载下的研究欠缺。项目拟系统地研究水平循环荷载下FRPC桩承载特性，建立循环荷载作用下的非线性计算模型，研究承载性能的循环弱化特性，采用强度理论和非相关流动法则，研究水平循环荷载作用下桩-土相互作用规律；通过FRPC桩宏细观试验，分析其水平循环荷载下的承载特性；采用有限元数值模拟考察荷载大小、加载频率、循环次数等参数对桩土相互作用的影响规律；最后研究经典理论方法对FRPC桩的适用性以及计算模型修正与参数的取值，预期揭示水平循环荷载下FRPC桩承载机理，建立其水平承载和变形的分析方法。

中文关键词： 水平循环荷载；FRPC组合桩；基本特性；试验研究；计算方法

英文摘要： The problem of durability is increasingly outstanding for pile with traditional material (steel, concrete, timber) in corrosive environment, which will require high maintenance and rehabilitation cost with high life-cycle cost. Concrete filled in FRP tube pipe pile is a novel type of composite pile with many advantages such as good resistance to physical and chemical corrosion, light weight and high strength and so on. It is scarce to study the bearing characteristic of concrete filled in FRP pipe especially under cyclic horizontal load. The nonlinear analysis model will be put forward and the weaken effect will be considered under horizontal cyclic load. The bearing capacity and deformation law under horizontal load will be analyzed by static load testing of FRP model pile; Pile-soil interaction will be explored under horizontal cyclic load by using strength theory and non-relative flow rule based on weaken rule of stress-strain relationship；Load value,load frequency and cyclic number will be studied by finite element simulation on the effect of pile-soil interaction; the applicability of traditional theory and empirical approaches of FRP pile will be analyzed, and the modification of calculation model and value of parameter will be given. The bearing mechanism of FRP pile will be revealed under cyclic horizontal load, and the analysis method will be put forward on bearing capacity and deflection.

英文关键词： cyclic horizontal load;FRPC composite pile;basic characteristic;experimental researsh;calculation method