等截面PC连续箱梁桥施工温度场及裂缝控制研究

发布时间：2018-03-13 21:27

本文选题：PC连续箱梁　切入点：日照温度　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：现阶段高速公路及城市立交高速发展，桥梁工程建设工程也随之进入到一个突飞猛进的发展阶段。由于箱梁桥具有抗扭刚度大、在一定的截面面积下能获得较大的抗弯惯矩的优势，，在近几十年新建的桥梁结构形式中占了绝大多数。为适应我国交通事业的发展进步，越来越多的大跨径桥梁如雨后春笋般出现，箱梁桥也成为大跨度连续梁桥和一些异形桥梁的主要结构形式。然而通过大量的调查研究表明，由太阳照射产生的温度应力严重影响连续箱型梁桥的使用寿命，温度在短时间内急剧变化是日照辐射温度场的主要特点，这种急剧的温度变化趋势势必会引起结构物表面和内部的温度不均匀分布，将对结构物本身的耐久性和安全性产生重大的影响。本文以河北地区邢衡高速公路坂上互通AK0+315.2立交桥为工程实例，对该桥的温度场进行观测以期得到能较为精确反映该桥温度场的试验结果。首先，本文系统全面地介绍了国内外专家学者对于温度场及温度效应的研究历史和现状，并详细论述了温度场研究过程中用到的理论知识和计算方法，针对PC连续箱梁桥温度应力的求解计算也做了相关的阐述。其次，根据现场的PC连续箱梁桥温度场试验数据，分析并总结了日照温度作用下的PC连续箱梁各部位温度场及PC连续箱梁结构内部水化热温度场的分布规律。在现场试验的基础上，运用Midas FEA结构分析软件对该工程实例进行数值仿真分析，并将现场实测的反映结构温度效应的应力应变值与软件计算值进行比较分析，进一步验证了前一阶段提出的温度场规律及温度实测值的准确性。针对PC连续箱梁桥施工过程中温度效应对工程实际产生的裂缝影响，结合研究分析过程，在总结PC连续箱梁桥温度场分布规律的基础上，提出了一系列PC连续箱梁桥防止温度裂缝形成发展的控制措施，对今后施工过程提供依据，有一定的参考价值。
[Abstract]:With the rapid development of expressway and urban interchange, the bridge construction project has entered a rapid development stage. Because of the large torsional stiffness of box girder bridge, In order to adapt to the development and progress of China's transportation industry, the advantage of obtaining greater bending inertia moment can be obtained under a certain cross-sectional area, which accounts for the vast majority of the newly built bridge structure forms in recent decades. More and more long-span bridges are springing up, and box girder bridges have become the main structural forms of long-span continuous girder bridges and some special-shaped bridges. The temperature stress caused by solar radiation seriously affects the service life of continuous box girder bridge, and the sharp change of temperature in a short time is the main characteristic of the temperature field of sunshine radiation. This sharp trend of temperature change will inevitably lead to uneven distribution of temperature on the surface and inside of the structure. It will have a great influence on the durability and safety of the structure itself. This paper takes the AK0 315.2 overpass of Xingheng Expressway in Hebei as an engineering example. The temperature field of the bridge is observed in order to obtain the experimental results which can accurately reflect the temperature field of the bridge. First of all, this paper systematically introduces the history and present situation of domestic and foreign experts and scholars on temperature field and temperature effect, and discusses in detail the theoretical knowledge and calculation method used in the research process of temperature field. The calculation of temperature stress of PC continuous box girder bridge is also discussed. Secondly, according to the temperature field test data of PC continuous box girder bridge, The distribution of temperature field of PC continuous box girder and the temperature field of hydration heat in PC continuous box girder structure under sunshine temperature are analyzed and summarized. The Midas FEA structural analysis software is used to simulate and analyze the engineering example, and the stress-strain values which reflect the temperature effect of the structure are compared with the calculated values of the software. Furthermore, the temperature field law and the accuracy of temperature measurement are verified. In view of the effect of temperature effect on the actual cracks of PC continuous box girder bridge during construction, combined with the research and analysis process, the temperature field distribution law of PC continuous box girder bridge is summarized. A series of control measures for PC continuous box girder bridge to prevent the formation and development of temperature cracks are put forward, which can provide the basis for the construction process in the future and have certain reference value.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U443.31

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