本文首先讨论了大体积混凝土的定义，建筑工程大体积混凝土的特点，温度及产生温度应力的条件，综述了大体积混凝土裂缝控制的研究现状。然后分析了大体积混凝土温度的变化过程，温度应力的发展过程及温度应力的类型。给出了大体积混凝土的各种温度计算方法以及温度应力的计算方法。
由于温度应力场的复杂性，很难用理论法求得精确解，现行主要用数值分析法。有限元具有易于适应不规则边界、可局部加密网格和易与计算机有限元程序配套，成为最主要的研究方法。
本文以工程实际为基础，提炼出大体积混凝土研究的各种热学、力学参数等基本资料，利用有限元软件comsol建立模型对混凝土浇筑后温度变化进行分析，总结了温度场随时间变化规律，空间分布情况，对具体时刻、特定节点进行了详细的分析。
Reserach on the temperature field of massive concrete shaft lining
Abstract
With the continuous development of our country economy, massive concrete will be more and more used in the construction of city.As the construction engineering field has its particularity,the problem of massive concrete crack has not yet formed a complete set of practical construction measures.At the same time,the correspomding theory and clauses in mass concrete construction code is not perfect.Because of the understanding of the hydration heat is not deep, many people have always ignored the influence to the structure crack of hydration heat which lead to temperature concrete crack at early ages, With the extensive application of massive concrete in civil engineering project the engineers pay increasing attention to temperature cracks.The key to control temperature cracks effectively lies in the precise prediction of temperature field and stress field.
Firstly, this essay has discussed the definition of “Massive Volume Concrete” in architectural project, the temperature and condition for cawing “Temperatural Press”. It has also generally described the present research condition in the control of “Massive Volume Concrete Cracks”. Then it has analyzed the changing course of the temperature in “Massive Volume Concrete”, and the course of the development and category of the “temperatural press”. It has also suggested the way of counting different kinds of temperature and temperatural press in “Massive Volume Concrete”
Because of the complexity of temperature stress field can hardly get an accurate solution with the theory law,we uaually use numerical analysis method nowadays.The finite element method has to be easy to adapt to an irregular margin,partial encryption mesh and easy to get along with,computer finite element method,so becoming the mainly most way of research.
With the foundation of engineering physically,refined various thermal learns’ and mechanics’ parameter,basic data,the actual pouring basin builds pattern and complicated boundary condition of massive concrere.Using the finite element software COMSOL to establish the model to analyze the temperature change after pouring the concrete.Tallied up the law of temperature field changes eith the time,spatial distribution condition,carried on detailed analysis to some special time and the particular nodal point.
Key Words： massive concrete, temperature field, temperature cracks，hydrated heat
目 录
致 谢 II
摘 要 II
Abstract II
1 绪论 2
1.1 研究背景及意义 2
1.2 大体积混凝土的定义及特点 2
1.2.1 大体积混凝土的定义 2
1.2.2 大体积混凝土的特点 2
1.3 大体积混凝土的温度及温度应力 2
1.4 国内外研究现状和问题 2
1.4.1 国外的研究概况 2
1.4.2 国内的研究概况 2
1.4.3 目前研究存在的问题 2
2 温度对大体积混凝土的危害及机理 2
2.1 温度裂缝对大体积混凝土的危害 2
2.2 大体积混凝土温度裂缝产生的原因 2
2.3 混凝土裂纹类型与分析 2
2.4 本章小结 2
3 大体积混凝土温度场与温度应力 2
3.1 混凝土温度场的理论分析 2
3.1.1 混凝土温度场的推导 2
3.1.2 初始条件和边界条件的处理 2
3.1.3 大体积混凝土结构表面保温层计算方法 2
3.2 水泥水化热反应与混凝土绝热温升 2
3.2.1 水泥水化热 2
3.2.2 混凝土的绝热温升 2
3.3 大体积混凝土的温度及温度应力分析 2
3.3.1 大体积混凝土温度变化过程 2
3.3.2 大体积混凝土温度计算 2
3.3.3 混凝土温度应力的基本概念 2
3.3.4 混凝土温度应力变化过程 2
3.4 大体积混凝土温度场、温度应力场计算方法简介 2
3.4.1 混凝土温度场求解方法概述 2
3.4.2 混凝土温度应力场求解方法概述 2
3.5 本章小结 2
4 实际工程应用分析 2
4.1 工程概况 2
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