港工钢管桩与上部结构剪力键连接方式的设计方法研究

发布时间：2018-04-30 12:02

本文选题：钢管与上部结构连接 + 剪力键　；参考：《重庆交通大学》2014年硕士论文

【摘要】：钢管桩以自身抗拉、抗压强度高，抗弯、抗剪能力强等优势在港工工程结构中得到了广泛、迅速的应用。然而，钢管与上部结构的连接部分一直关系着整个结构的安全与稳定，也是结构正常使用的基础。钢管桩与上部结构的连接方式中一种形式就是采用剪力键连接，剪力键的连接方式国内外相关规范尚无明确规定，也没有完整的计算理论。因此，关于钢管桩与上部结构剪力键连接的设计方法研究，具有重要的意义。本文探讨了剪力键连接方式的破坏模式,分析总结了其破坏机理。在研究钢管受力过程中，以广义胡克定律为基础，基于一定假设条件推导了核心混凝土在轴力作用下轴向应力与环向应力的关系表达式，得到混凝土作用在钢管上的径向力。将弹性地基梁比拟法应用到解决钢管问题上，把钢管看作弹性地基上的梁，选用SAP2000有限元分析软件对钢管不同受力模式进行数值模拟。通过施加不同轴向力，得到不同荷载作用下钢管剪力键处的环向应变的数值模拟结果，与实验实测应变值相比较，验证轴力作用下钢管近似分析方法的有效性。结果显示：钢管近似分析方法得到的结果与实验实测结果比较接近且具有相同的变化规律，，并发现钢管在剪力键处环向应变值最大。钢管在轴力作用下的近似计算方法可用来计算剪力键连接处钢管的受力、位移、应力、应变，为剪力键连接的钢管承载力计算及设计方法提供参考。本文运用轴力作用下钢管近似分析方法来研究连接处设置多个剪力键的受力特性，将总轴力按不同比例分配到各个剪力键来承担，研究发现：更靠近端部的剪力键承担的轴力超过总轴力的一半，且随着轴力的增大所占轴力的比值也越来越大；剪力键间距越小，更靠近桩顶的剪力键所承担的轴力占总轴力的比越大。剪力键连接处的应力集中不容忽视，本文在研究中发现剪力键与钢管在焊接连接处，应力集中系数约为1.9~2.1。本文提出的轴力作用下钢管近似分析方法，以及此方法在研究剪力键连接相关问题中的应用都将为剪力键连接的设计方法提供参考。
[Abstract]:The steel pipe pile has been widely and rapidly applied in the structure of port engineering because of its advantages of high tensile strength, high compressive strength, bending resistance and strong shear capacity. However, the connection part between steel pipe and superstructure is always related to the safety and stability of the whole structure, and is also the basis of the normal use of the structure. One form of connection between steel pipe pile and superstructure is to adopt shear bond connection. The connection mode of shear bond has not been clearly stipulated in the relevant codes at home and abroad and there is no complete calculation theory. Therefore, it is of great significance to study the design method of shear bond connection between steel pipe pile and superstructure. In this paper, the failure mode of shear bond connection is discussed, and its failure mechanism is analyzed and summarized. On the basis of generalized Hook's law and some assumptions, the expression of the relationship between the axial stress and the circumferential stress of the core concrete under the axial force is derived, and the radial force of the concrete acting on the steel tube is obtained. The elastic foundation beam analogy method is applied to solve the steel pipe problem. The steel pipe is regarded as the beam on the elastic foundation. The SAP2000 finite element analysis software is used to simulate the different stress modes of the steel pipe. By applying different axial forces, the numerical simulation results of the circumferential strain at the shear bond of the steel tube under different loads are obtained, and the validity of the approximate analysis method for the steel tube under the axial force is verified by comparing with the experimental measured strain value. The results show that the results obtained by the approximate analysis method are close to the experimental results and have the same variation law. It is also found that the circumferential strain value of the steel pipe is the largest at the shear bond. The approximate calculation method of steel pipe under axial force can be used to calculate the stress, displacement, stress and strain of the steel pipe at the connection of shear key, which provides a reference for the calculation and design of the bearing capacity of the steel pipe connected by the shear bond. In this paper, the approximate analysis method of steel pipe under axial force is used to study the mechanical characteristics of multiple shear keys set at the joint, and the total axial force is distributed to each shear bond according to different proportions. It is found that the axial force of the shear bond closer to the end is more than half of the total axial force, and the ratio of the axial force to the axial force increases with the increase of the axial force. The ratio of the axial force to the total axial force is larger by the shear bond closer to the top of the pile. The stress concentration at the joint of shear bond can not be ignored. In this paper, it is found that the stress concentration factor between shear bond and steel pipe is about 1.9 ~ 2.1. In this paper, the approximate analysis method of steel pipe under axial force and its application in the study of the problems related to the connection of shear bond will provide a reference for the design method of the connection of shear bond.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U655.5

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