预应力钢丝螺距对PCCP受力性能影响分析
发布时间：2018-12-11 15:50
【摘要】：预应力钢筒混凝土管（PCCP）作为复合型管材兼有钢管和混凝土管的优点，被越来越多地应用于输水工程中，因此近年来对于PCCP的研究越来越得到重视。由于PCCP自身的结构特点，预应力钢丝对于PCCP的承载能力和受力性能十分重要，但是当前针对预应力钢丝螺距对PCCP受力性能的影响还是空白。本文拟通过分析研究预应力钢丝螺距对PCCP受力性能的影响规律，为工业界在PCCP结构设计时相同配筋率下钢丝与螺距的科学选取提供依据；并通过二维、三维有限元对比分析，试图建立从三维分析模型向二维分析模型转化的简化方法。具体工作如下： （1）基于国内外有关PCCP有限元研究现状的分析，重点探讨了PCCP建模过程中存在的难点及可能的解决方法；并结合前人研究基础及实际工程问题的需要，分析建立了本文研究的重点内容，即研究预应力钢丝螺距对PCCP受力性能的影响以及探索三维分析模型向二维分析模型转换的方法。 （2）基于Olander分布系数法，针对具体算例，分析计算了PCCP上作用的土荷载、管自重、流体自重以及内水压力的大小和分布形态。 （3）基于PCCP结构自身的受力特点，构建了适用于PCCP受力分析的平面应变模型。进行了正常使用极限状态和承载力极限状态下（总计11种工况）的PCCP的受力状态分析，得到各工况下PCCP各部位的应力应变响应。 （4）为研究钢丝螺距对PCCP受力性能的影响，本文建立了钢丝螺距分别为0.010m、0.014m、0.017m、0.020m、0.023m、0.026m、0.029m、0.032m、0.035m、0.038m10组PCCP三维模型（该三维模型轴向网格的划分恰好与钢丝的螺距一致）。通过该10组模型在WT3和FWT6两种工况下PCCP的受力分析，得出以下规律：在工况WT3作用下管中位置的内层管芯，除了个别的螺距外，应力值基本保持不变，在管端位置随着螺距的增大而减小；在工况FWT6作用下，管芯各部分的应力随着螺距的增大呈现逐渐减小的趋势。 （5）通过二维模型和三维模型的应力对比分析，得出了三维模型向二维模型转换的公式：M3k M2，其中M3为三维模型计算得到的应力值，为预应力钢丝螺距，，M2为二维模型计算出的应力值，k为三维模型向二维模型的简化系数。
[Abstract]:Prestressed steel cylinder concrete pipe (PCCP) is more and more widely used in water conveyance engineering, as the composite pipe has the advantages of both steel tube and concrete pipe, so in recent years, more and more attention has been paid to the research of PCCP. Because of the structural characteristics of PCCP, prestressed steel wire is very important to the bearing capacity and mechanical performance of PCCP, but the influence of pitch of prestressed steel wire on the mechanical performance of PCCP is still blank. In this paper, the influence of the pitch of prestressed steel wire on the mechanical properties of PCCP is analyzed and studied, which provides the basis for the scientific selection of steel wire and pitch in industry under the same reinforcement ratio in the design of PCCP structure. Through the comparative analysis of two-dimensional and three-dimensional finite element, the simplified method of transforming from three-dimensional analysis model to two-dimensional analysis model is established. The specific work is as follows: (1) based on the analysis of the current situation of PCCP finite element research at home and abroad, the difficulties and possible solutions in the process of PCCP modeling are discussed. According to the needs of previous research foundation and practical engineering problems, the main contents of this paper are analyzed and established, that is, to study the influence of prestressed steel wire pitch on the mechanical properties of PCCP and to explore the method of transforming 3D analysis model to two-dimensional analysis model. (2) based on the Olander distribution coefficient method, the size and distribution of soil load, pipe weight, fluid weight and internal water pressure on PCCP are analyzed and calculated. (3) based on the stress characteristics of PCCP structure, a plane strain model suitable for PCCP stress analysis is constructed. The stress state analysis of PCCP under the limit state of normal use and the ultimate state of bearing capacity (11 working conditions in total) is carried out, and the stress-strain response of each part of PCCP under each condition is obtained. (4) in order to study the effect of steel wire pitch on the mechanical properties of PCCP, the steel wire pitch is 0.010 mU 0.014 mU 0.017 mU 0.020 mU 0.023 mN 0.026 mN 0.029 mU 0.032 mU 0.035 m, respectively. 0.038m10 group PCCP 3D model (the axial mesh division of the 3D model is exactly the same as the pitch of steel wire). Through the stress analysis of the 10 groups of models under WT3 and FWT6 conditions, the following laws are obtained: the stress value of the inner tube core in the position of the tube under the action of WT3 is basically unchanged except for the individual pitch. The position at the end of the pipe decreases with the increase of pitch. Under the action of FWT6, the stress of each part of the tube core decreases gradually with the increase of pitch. (5) by comparing and analyzing the stress of 2D model and 3D model, the conversion formula of 3D model to 2D model is obtained: M3k M2, where M3 is the stress value calculated by 3D model, and is the pitch of prestressed steel wire. M2 is the stress value calculated by the two-dimensional model and k is the simplified coefficient from the three-dimensional model to the two-dimensional model.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9
本文编号：2372812
[Abstract]:Prestressed steel cylinder concrete pipe (PCCP) is more and more widely used in water conveyance engineering, as the composite pipe has the advantages of both steel tube and concrete pipe, so in recent years, more and more attention has been paid to the research of PCCP. Because of the structural characteristics of PCCP, prestressed steel wire is very important to the bearing capacity and mechanical performance of PCCP, but the influence of pitch of prestressed steel wire on the mechanical performance of PCCP is still blank. In this paper, the influence of the pitch of prestressed steel wire on the mechanical properties of PCCP is analyzed and studied, which provides the basis for the scientific selection of steel wire and pitch in industry under the same reinforcement ratio in the design of PCCP structure. Through the comparative analysis of two-dimensional and three-dimensional finite element, the simplified method of transforming from three-dimensional analysis model to two-dimensional analysis model is established. The specific work is as follows: (1) based on the analysis of the current situation of PCCP finite element research at home and abroad, the difficulties and possible solutions in the process of PCCP modeling are discussed. According to the needs of previous research foundation and practical engineering problems, the main contents of this paper are analyzed and established, that is, to study the influence of prestressed steel wire pitch on the mechanical properties of PCCP and to explore the method of transforming 3D analysis model to two-dimensional analysis model. (2) based on the Olander distribution coefficient method, the size and distribution of soil load, pipe weight, fluid weight and internal water pressure on PCCP are analyzed and calculated. (3) based on the stress characteristics of PCCP structure, a plane strain model suitable for PCCP stress analysis is constructed. The stress state analysis of PCCP under the limit state of normal use and the ultimate state of bearing capacity (11 working conditions in total) is carried out, and the stress-strain response of each part of PCCP under each condition is obtained. (4) in order to study the effect of steel wire pitch on the mechanical properties of PCCP, the steel wire pitch is 0.010 mU 0.014 mU 0.017 mU 0.020 mU 0.023 mN 0.026 mN 0.029 mU 0.032 mU 0.035 m, respectively. 0.038m10 group PCCP 3D model (the axial mesh division of the 3D model is exactly the same as the pitch of steel wire). Through the stress analysis of the 10 groups of models under WT3 and FWT6 conditions, the following laws are obtained: the stress value of the inner tube core in the position of the tube under the action of WT3 is basically unchanged except for the individual pitch. The position at the end of the pipe decreases with the increase of pitch. Under the action of FWT6, the stress of each part of the tube core decreases gradually with the increase of pitch. (5) by comparing and analyzing the stress of 2D model and 3D model, the conversion formula of 3D model to 2D model is obtained: M3k M2, where M3 is the stress value calculated by 3D model, and is the pitch of prestressed steel wire. M2 is the stress value calculated by the two-dimensional model and k is the simplified coefficient from the three-dimensional model to the two-dimensional model.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9
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