预应力混凝土管桩的抗震性能及耐久性分析

发布时间：2018-10-08 16:57

【摘要】：预应力混凝土管桩是常见的一种桩基类别，作为一类深基础它被大量使用于各类地基处理中。工业建筑、民用建筑、道路、桥梁等等都能见到预应力管桩的身影。管桩具有工艺简单、品质性能好、生产周期短、制造成本低、检测方便、可大规模工业化生产等优点。但由于预应力管桩不同于普通的实心桩，中空的构造，使其力学特性与普通桩存在差异，在抗震性上表现的最为突出。本文针对于预应力混凝土管桩的抗震性运用大型有限元分析软件ANSYS对地震荷载作用下的预应力混凝土管桩进行桩—土动力分析，并探讨了预应力管桩耐久性的影响因素，对预应力混凝土管桩的耐久性进行分析。本文主要进行了以下工作： 1、总结了关于预应力混凝土管桩及其抗震性的研究现状，从桩—土体系的本构模型以及桩—土间相互作用的机理出发，探究了桩—土动力作用的本质及分析方法。 2、进一步分析桩与土动力作用的机理，利用ANSYS建立单根预应力混凝土管桩单桩—土层系统的有限元模型，分析单根预应力混凝土管桩地震作用下的响应。采用宁河天津波，，考虑约束均为线弹性状态、非线性状态、半线性半非线性状态，对在地震荷载下的桩基—土层进行分析对比，从而得到较准确的预应力混凝土管桩的地震响应及受力情况。 3、建立预应力混凝土管桩桩基群，分别采用三种地震波对管桩桩基群施加影响，对不同地震波作用下的桩基群响应、不同地震波加速度下的桩基群响应、不同地震波加载方向下的桩基群响应、不同地震波频率下的桩基群响应进行分析。 4、考虑氯离子的侵蚀作用及各种主要因素，对预应力混凝土管桩的耐久性进行分析。论文研究成果可为预应力混凝土管桩设计与处理提供基本的理论支持和数值验证，对实际工程具有一定的指导意义。
[Abstract]:Prestressed concrete pipe pile is a common type of pile foundation. As a kind of deep foundation, it is widely used in all kinds of foundation treatment. Industrial buildings, civil buildings, roads, bridges and so on can see the figure of prestressed pipe pile. The pipe pile has the advantages of simple process, good quality, short production cycle, low manufacturing cost, convenient detection and large scale industrial production. However, the mechanical properties of prestressed pipe pile are different from those of ordinary pile because of its hollow structure, which is different from ordinary solid pile. In this paper, the pile-soil dynamic analysis of prestressed concrete pipe pile under earthquake load is carried out by using the large-scale finite element analysis software ANSYS, and the influencing factors of the durability of the prestressed concrete pipe pile are discussed. The durability of prestressed concrete pipe pile is analyzed. The main work of this paper is as follows: 1. The research status of prestressed concrete pipe pile and its seismic resistance are summarized. The constitutive model of pile-soil system and the mechanism of pile-soil interaction are discussed. The nature and analysis method of pile-soil dynamic action are discussed. 2. The mechanism of dynamic interaction between pile and soil is further analyzed. The finite element model of single prestressed concrete pipe pile and soil layer system is established by using ANSYS, and the response of single prestressed concrete pipe pile under earthquake action is analyzed. Taking into account that the constraints are linear elastic state, nonlinear state and semilinear semi-nonlinear state, the pile foundation and soil layer under earthquake load are analyzed and compared by using Tianjin wave of Ninghe River. The seismic response and stress of prestressed concrete pipe pile are obtained. 3. The pile foundation group of prestressed concrete pipe pile is established. Three kinds of seismic waves are used to affect the pile foundation group, and the response of pile foundation group under different seismic waves and the pile foundation group response under different seismic wave acceleration are discussed. The pile group response under different seismic wave loading direction and the pile foundation group response under different seismic wave frequency are analyzed. 4. The durability of prestressed concrete pipe pile is analyzed considering the corrosion action of chloride ion and various main factors. The research results of this paper can provide basic theoretical support and numerical verification for the design and treatment of prestressed concrete pipe pile, and have certain guiding significance for practical engineering.
【学位授予单位】：中国石油大学（华东）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU473.1

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