U型钢板桩墙桩间锁口摩擦力及其抗弯刚度研究

发布时间：2018-05-21 21:08

本文选题：U型钢板桩 + 锁口　；参考：《华南理工大学》2015年硕士论文

【摘要】：钢板桩作为一种新型环保材料在工程建设领域得到越来越多的重视和应用。作为一种柔性支护结构,钢板桩具有轻质、高强、隔水性好、施工方便等优点。由于U型钢板桩特殊的构造和锁口连接方式,在U型钢板桩实际工作中,桩间锁口会发生相对滑移从而使U型钢板桩组合墙的截面抗弯刚度和强度发生折减。这导致U型钢板桩组合墙的实际截面抗弯刚度和强度成为了一个不确定的量,给工程设计中的支护结构的变形计算和强度验算带来了难题。本文主要从钢板桩锁口间摩擦的角度来探究在以锁口间摩擦力承担剪力的情况下,摩擦力对U型钢板桩墙截面抗弯刚度的影响。本文以U型钢板桩组合墙一个对称循环单位体为研究对象,通过建立钢板桩截面上的静力平衡方程和接触面上的力矩平衡方程来探究桩墙截面抗弯刚度与摩擦作用以及桩墙中单片钢板桩抗弯刚度之间的关系,研究了U型钢板桩组合墙截面抗弯刚度的形成机理,得到了桩墙截面抗弯刚度与锁口摩擦力、截面弯矩的关系。在纯弯条件下,通过对桩墙微分单元在锁口处的变形分析,推导出了桩墙中钢板桩移轴距离和曲率以及相对滑移量在桩长方向上的变化率的关系。同时,本文通过ABAQUS建模,分析了翼缘侧向荷载以及支撑方式对桩墙截面抗弯刚度的影响,从而确定了建模时的加载条件和边界条件。通过对算例计算结果的分析,说明了钢板桩移轴距离和桩墙截面抗弯刚度随荷载非线性增加的过程,得到了桩墙锁口滑移量及其变化率、曲率和截面抗弯刚度在桩长方向上的分布特征,并进一步分析了桩墙截面抗弯刚度的形成机理。
[Abstract]:As a new type of environmental protection material, steel sheet pile has been paid more and more attention and applied in the field of engineering construction. As a flexible supporting structure, steel sheet pile has the advantages of light weight, high strength, good water insulation and convenient construction. Because of the special structure and locking connection mode of U-shaped steel sheet pile, the relative slippage between piles will occur in the practical work of U-shaped steel sheet pile, which will reduce the bending stiffness and strength of the section of U-shaped steel sheet pile composite wall. As a result, the bending stiffness and strength of the actual section of U-shaped steel sheet pile composite wall become an uncertain quantity, which brings difficulties to the deformation calculation and strength checking calculation of the supporting structure in engineering design. In this paper, from the angle of friction between locking holes of steel sheet pile, the influence of friction force on the bending stiffness of U-shaped steel sheet pile wall is studied. In this paper, a symmetrical circular unit body of U-shaped steel sheet pile composite wall is taken as the research object. By establishing the static equilibrium equation on the steel plate pile section and the moment equilibrium equation on the contact surface, the relationship between the bending stiffness of the pile wall section and friction and the bending stiffness of the single sheet steel plate pile in the pile wall is studied. The forming mechanism of the bending stiffness of U-shaped steel sheet pile composite wall is studied. The relationship between the bending stiffness of pile wall section and the friction force and bending moment of the section of the pile wall is obtained. Under pure bending condition, the relationship between the distance, curvature and relative slip of steel plate pile in the direction of pile length is derived by analyzing the deformation of the differential unit of pile wall at the lock-hole. The relationship between the distance and curvature of the steel plate pile in the pile wall and the relative slip value in the direction of the pile length is derived. At the same time, through ABAQUS modeling, the influence of flange lateral load and bracing mode on the bending stiffness of pile wall section is analyzed, and the loading conditions and boundary conditions are determined. Through the analysis of the calculation results of the numerical examples, the process of nonlinear increase of the axial distance of steel plate pile and the flexural stiffness of the pile wall section with load is explained, and the slip quantity and the change rate of the pile wall lock mouth are obtained. The distribution characteristics of curvature and section bending stiffness in the direction of pile length are analyzed, and the forming mechanism of pile wall cross-section bending stiffness is analyzed.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU473.1

【参考文献】