基于桩间锁扣摩擦分析的钢板桩刚度特性研究

发布时间：2018-06-25 01:46

本文选题：钢板桩 + 锁扣　；参考：《华南理工大学》2014年硕士论文

【摘要】：近些年来，钢板桩作为一种柔性支护结构，被广泛的应用于基坑支护、桥梁围堰、港口码头等项目中，它具有施工方便、强度高、可重复利用等优点。钢板桩主要是靠锁扣之间连接，连续成墙形成一个整体结构，其桩墙主要受弯，相当于异型截面的组合梁。研究发现，钢板桩锁扣在实际工作中会发生滑移，这就导致钢板桩的刚度达不到理想桩墙的刚度，这种现象被称为“折减效应”。钢板桩锁扣之间依靠摩擦力的作用传递剪力，摩擦力的大小随钢板桩的变形而发生改变，这就导致了钢板桩的力学特性呈非线性。在目前的钢板桩工程设计中，钢板桩在实际工作中的准确刚度难以确定，无法准确计算钢板桩的实际变形，给钢板桩支护结构的设计带来了困难。首先，本文主要依据钢板桩的截面特点，以组合梁的理论讨论了钢板桩刚度非线性变化的原因，得出了钢板桩刚度随中性轴移动而变化的规律。然后，本文利用有限元软件建立钢板桩接触摩擦计算模型，，得到了不同变形状态下钢板桩的刚度，并分析了钢板桩刚度随曲率变化的特点，同时讨论了桩间摩擦力改变对刚度的影响规律。此外，对钢板桩刚度变化曲线进行分析，得出了钢板桩刚度成长度和曲率之间的关系。最后，通过对钢板桩刚度变化曲线的拟合，得出了根据钢板桩曲率确定其刚度方法。同时，给出了钢板桩刚度和中性轴位置随弯矩的变化曲线，即可根据钢板桩所受荷载确定其刚度和中性轴位置，从而为钢板桩位移和应力的计算提供了较为合理可靠的依据。
[Abstract]:In recent years, as a flexible supporting structure, steel sheet pile has been widely used in foundation pit support, bridge cofferdam, port wharf and other projects, it has the advantages of easy construction, high strength, reusable and so on. The steel sheet pile is mainly connected by locking buckles and forms a whole structure with continuous wall forming. The pile wall is mainly bent and is equivalent to the composite beam with special-section. It is found that the locking of steel plate pile will slip in practice, which leads to the stiffness of steel plate pile can not reach the stiffness of ideal pile wall. This phenomenon is called "reduction effect". Shear force is transmitted by friction between lock buckles of steel plate pile. The magnitude of friction force changes with the deformation of steel plate pile, which leads to the nonlinear mechanical properties of steel plate pile. In the present steel plate pile engineering design, it is difficult to determine the exact stiffness of the plate pile in the actual work, which can not accurately calculate the actual deformation of the steel plate pile, which brings difficulties to the design of the steel plate pile supporting structure. Firstly, according to the cross-section characteristics of steel plate pile, the paper discusses the reason of the nonlinear change of steel plate pile stiffness based on the theory of composite beam, and obtains the rule that the steel plate pile stiffness changes with neutral axis. Then, the contact friction calculation model of steel plate pile is established by using finite element software, and the stiffness of steel plate pile under different deformation state is obtained, and the characteristics of steel plate pile stiffness with curvature are analyzed. At the same time, the influence of friction between piles on stiffness is discussed. In addition, the relationship between stiffness growth degree and curvature of steel plate pile is obtained by analyzing the stiffness variation curve of steel plate pile. Finally, by fitting the stiffness curve of steel plate pile, the stiffness method is obtained according to the curvature of steel plate pile. At the same time, the curve of stiffness and neutral axis position with bending moment of steel plate pile is given. The stiffness and neutral axis position of steel plate pile can be determined according to the load, which provides a reasonable and reliable basis for the calculation of displacement and stress of steel plate pile.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU473.1

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