土木工程专业英语论文.docx

2012级土木工程（本）专业《土木工程英语》课程论文

论文题目：混凝土结构温度应力分析
Concrete structure temperature stress analysis

专业班级： 土木工程2班
学生姓名： 魏云飞
学 号： 123008010227
论文成绩：
评阅教师： 胡 郢

2015年11月8日

超长混凝土结构的温度应力分析与控制技术研究 陈军毅 ，浙江大学，结构工程，2006，硕士
【摘要】 随着我国经济建设的迅速发展和建筑技术水平的提高,超长混凝土结构不断在大型公共建筑和工业建筑中出现。由于考虑到建筑上的美观性和结构上的整体性,这些建筑往往不设或少设温度伸缩缝,致使通长不设缝的结构长度远远超出了我国规范规定的伸缩缝限值。对于超长混凝土结构,温度应力是必须考虑的重要因素,也是引起这类结构裂缝的主要原因。所以对超长混凝土结构温度应力的分析并研究其有效的控制技术具有重要的意义。 本文首先总结了国内外关于超长混凝土结构温度应力的研究现状,并简要地介绍了温度应力的弹性力学理论,然后概述了应用大型通用有限元软件ANSYS分析超长混凝土结构温度应力的有限元理论。由于混凝土工程结构长期经受自然环境气温变化和日照辐射等的作用,加上混凝土材料较差的热传导性能,使得结构的温度场成为一个很复杂的不稳定温度场。本文着重探讨了结构各种温度荷载作用的效应。 本文的研究内容主要包括:分析了超长结构年温差作用效应,探讨了结构在年温差荷载作用下各构件的温度内力和温度变形特点,并对其影响因素作了参数化分析,重点分析了剪力墙构件的影响;结合某一典型超长框架——剪力墙结构,分析了超长结构的水平瞬时温差作用效应,对日照温度场及非线性温度分布的分解和等效作了一定探讨,通过比较均匀温度场及线性温度场下的结构效应,得到了温度梯度对结构内力和变形产生的影响;简要分析了结构的竖向瞬时温差作用效应 针对目前超长结构分析中往往假定整个结构均匀温降的合理性进行了分析,研究了结构在考虑梁温差滞后的温度作用效应,并对其影响因素作了参数化分析;分析了无粘结预应力技术在超长结构温度应力控制中的作用,结合一典型超长结构,分析了该结构在直线无粘结预应力筋作用下的变形和内力,并分析比较了不同预应力筋布筋形式下的结构效应,得出了合理布筋形式,即在柱上板区域集中布筋,并应对超长结构留设后浇带分段张拉预应力筋;最后结合一具体工程——杭州市江干区全民健身中心,对三层楼板温度场监测数据进行分析处理并得到控制温差荷载,对该结构在控制温差荷载及预应力作用下的结构效应进行了三维有限元分析。将数值分析与实测结果比较表明,用有限元方法来分析超长混凝土结构温度应力是可行的。国家的经济在不断飞速的发展，人们对建筑的安全性和美观性也有了新的认识和要求，一些公共建筑正逐渐向舒适化、大型化发展，超长混凝土结构不断的涌现在大型公共建筑和工业建筑中。出于对整体性和美观性的考虑，我们的设计师往往在这些建筑中不设或少设伸缩缝，然而对于超长混凝土结构，温度应力是必须考虑的重要因素，也是引起这些结构产生裂缝的主要原因，因此对超长混凝土结构温度应力的分析并用有限元软件模拟具有重要意义。本文的主要工作内容如下：首先概述了超长混凝土结构的研究背景和发展概况，阐述了超长混凝土结构相关的收缩理论、徐变理论以及温度应力基本理论。接着简要介绍了现场监测技术在超长混凝土结构中的应用，对某实际超长混凝土结构进行了一年多的现场跟踪监测，并对监测数据进行了处理分析。最后对实际超长混凝土结构在整体温度作用下的效应进行了模拟分析，总结得出超长混凝土结构的温度应力分布特点，并对影响温度应力的因素做了参数分析。本文通过对超长混凝土结构的温度应力进行监测分析以及Ansys有限元模拟分析得出了一些十分有益的结论，所做工作对今后类似超长混凝土结构的设计与施工是有很大帮助。
With the improvement of China's economic construction and rapid development and the level of construction technology, the overlong concrete structure is emerging in large public buildings and industrial buildings. Due to architectural appearance and structure as a whole, these buildings often no or less temperature is adjustable seam, resulting in full-length seam structure length far beyond our specification adjustable seam limits. For the super long concrete structure, temperature stress is an important factor that must be considered, but also caused the main reason for this kind of structure crack. So for super long concrete structure temperature should force analysis and study the effective control technology has important significance. In this paper, the total This paper briefly introduces the finite element theory of the temperature stress of the concrete structures, which is a very complicated and unstable temperature field. The temperature field of concrete structures is a very complicated and unstable temperature field. The temperature field of the structure is analyzed, and the effect of temperature field is analyzed. The effects of temperature gradient on the structural internal force and deformation of the structure are discussed, and the effects of temperature gradient on the internal force and deformation of the structure are analyzed. The effects of temperature gradient on the internal force and deformation of the structure are discussed, and the effects of temperature gradient on the structural internal force and deformation are discussed. This paper analyzes the rationality of the uniform temperature drop of the whole structure, studies the effect of temperature on the temperature difference between the structure and its influence factors, analyzes the deformation and internal force under the action of linear non bonded prestressed tendons, analyzes the deformation and internal force, and gives the reasonable layout, that is, the area of the plate is concentrated, and the length of the paper is designed. Jianggan District national fitness center, the three floor temperature field monitoring data analysis and control of temperature field, the structure of the structure under the control of temperature and stress, the finite element method to analyze the concrete structure temperature stress is feasible. The national economy in the continuous development, people on the construction safety and aesthetics also has a new understanding and requirements, some public buildings are gradually to the comfort, large-scale development, large public buildings and industrial buildings. Body resistance and aesthetics consideration, our designers often in these buildings with no or less expansion joint. However, for the super long concrete structure, temperature stress is an important factor that must be considered, but also caused the main reason for cracks in these structures, so on the long mixed background and overview of force analysis of the concrete structure temperature stress and finite element software simulation is of great significance. The main contents of this paper are as follows: first, an overview of the super long concrete structure, expounds the overlong concrete structure shrinkage theory, the theory of creep and temperature should be basic theory of power. Then briefly introduce the field monitoring technology in super long concrete structure In this paper, the design and analysis of the temperature stress distribution characteristics of ultra long concrete structures are analyzed, and the influence of the temperature stress on the design and construction of the super long concrete structures is analyzed. The results are very useful for the design and construction of the Ansys. This paper analyzes the effect of the structure of the concrete.

To figure out the distribution of temperature gradient along the girder height of steel-concrete composite box girder, combined with the mechanical characteristics of prestressed concrete composed box girder with corrugated steel webs, the calculation formulas of cross-sectional temperature stress along the span in a simply-supported beam bridge with composite section were derived under the conditions of static equilibrium and deformation compatibility of the beam element. The methods of calculating the maximum temperature stress value were discussed when the connectors are assumed rigid or flexible. Theoretical and numerical results indicate that the method proposed shows better precision for the calculation of temperature self-stress in both the top and the bottom surfaces of the box girder. Moreover, the regularity of temperature stress distribution at different locations along the girder span is that the largest axial force of the top or the bottom plate of the box girder is located in the midspan and spreads decreasingly until zero at both supported ends, and that the greatest longitudinal shear density in steel-concrete interface appears at both supported ends and then reduces gradually to zero in the midspan.Reliable computational prognoses of the structural integrity and serviceability throughout the lifetime of structures require the realistic consideration of the damage behaviour of the construction materials for various loading scenrios including static and cyclic loading, environmental loading processes such as moisture and heat transport, corrosion processes, freeze-thaw actions and possible interactions between these long- and short-term processes. Both, load-induced damage mechanisms such as evolving microcracks and physically and chemically induced deterioration originate from mechanical, physical and chemical processes starting at lower scales of the microstructure of the materials. Investigating and understanding these processes acting at various scales is a prerequisite for the development of adequate and suitable material models suitable for life-time oriented simulations.
为了找出温度梯度沿钢筋混凝土组合箱梁梁高度的分布，结合预应力砼组合箱梁波形钢腹板的机械特性，横截面温度应力的计算公式沿跨度在复合段简支梁桥进行静平衡和梁单元的变形协调的条件下得到的。当连接器假定刚性或柔性的计算最大温度应力值的方法进行了讨论。理论和数值结果表明，对于自身温度胁迫中的顶部和所述箱梁的底面的计算方法提出节目更好的精度。此外，在沿梁跨度不同位置温度应力分布规律是，顶部或箱梁的底板的最大轴向力位于中跨和扩散渐减直到零双方都支持两端处，并且该在钢 - 混凝土接口最大纵向剪切密度出现双方都支持两端处，然后在整个结构的寿命所需要的现实考虑的建筑材料的破坏行为的逐渐减小到零的结构完整性和可维护性的计算预后关于各种装载包括静态和循环加载，环境负荷过程，如湿气和热量输送，腐蚀过程，冻融动作和这些长期和短期的进程之间的可能的相互作用。既，负载诱导损伤的机制，例如演进的微裂纹和物理和化学上从机械，物理和化学过程诱导劣化源于起始材料的微观结构的较低比例。调查和了解作用于各种规模的这些过程是适合生命周期导向模拟足够和合适的材料模型发展的前提。