陆上风电扩展基础的温度和应力分析

发布时间：2018-05-15 13:48

本文选题：大体积混凝土 + 温度场　；参考：《天津大学》2014年硕士论文

【摘要】：扩展基础是一种基本的重力式基础,经常使用在海上风电工程中,是一种大体积混凝土基础。这种大体积混凝土基础的早龄期特性,尤其是裂缝的发展,很大程度上受混凝土温度的影响。本文运用商业有限元软件ABAQUS来分析混凝土浇筑7天前扩展基础的温度和应力分布,为了获得这种基础的早龄期混凝土的力学性能,用有限元软件建立了多组模型。本人的主要研究内容为:1、对大体积混凝土的概念作了简要的分析,引入了早龄期混凝土的概念,介绍了温度应力和温度裂缝的产生原因,针对温度裂缝,从宏观角度和微观角度两个方面进行了分析,总结了大体积混凝土的水化热、温度应力、温度裂缝的控制预防措施。2、在第三章中对大体积混凝土温度场的理论进行了详细讲解,包括混凝土的热传导方程、水泥水化温度上升、混凝土的抗压强度、抗拉强度、弹性模量等热学参数,为第四章的有限元分析提供了理论依据,特别是一些参数的选择和计算,使有限模拟结果更加精确。3、利用大型有限元软件ABAQUS建立了多组有限元模型,对混凝土的扩展基础的温度场和温度应力的分布情况进行了分析,然后研究了混凝土开裂情况,同时研究了基础环对温度场的影响程度,得到了混凝土扩展基础应力的分布情况和开裂趋势。
[Abstract]:The extended foundation is a basic gravity foundation, which is often used in offshore wind power engineering and is a mass concrete foundation. The early age characteristics of this mass concrete foundation, especially the development of cracks, are largely affected by the temperature of concrete. A commercial finite element software ABAQUS is used to analyze the temperature and stress distribution of the spreading foundation of concrete 7 days before pouring. In order to obtain the mechanical properties of the early age concrete of this foundation, the finite element software has been used to establish several groups of models. In this paper, the concept of mass concrete is briefly analyzed, the concept of early age concrete is introduced, and the causes of temperature stress and temperature crack are introduced. This paper analyzes the hydration heat, temperature stress and temperature crack control measures of mass concrete from two aspects of macroscopic and micro angle. In the third chapter, the theory of mass concrete temperature field is explained in detail. Including the heat conduction equation of concrete, the rise of cement hydration temperature, the compressive strength, tensile strength, elastic modulus of concrete and other thermal parameters, which provides the theoretical basis for the finite element analysis of chapter 4, especially the selection and calculation of some parameters. In order to make the finite simulation results more accurate, a series of finite element models are established by using the large-scale finite element software ABAQUS. The distribution of temperature field and thermal stress of the concrete expansion foundation is analyzed, and then the cracking of concrete is studied. At the same time, the influence of foundation ring on temperature field is studied, and the stress distribution and cracking trend of concrete propagating foundation are obtained.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU476;TM614

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