大跨度连续梁悬臂施工期日照温度引起的应力和变形研究

发布时间：2018-05-24 21:19

本文选题：连续梁 + 悬臂施工　；参考：《北京交通大学》2016年硕士论文

【摘要】：预应力混凝土连续梁因其结构刚度大、整体性好、行车平顺、养护简单等特点被广泛应用于桥梁建设中。连续梁悬臂施工克服了受地形、江河等不利自然条件的限制,是建设预应力混凝土连续梁较为常用的施工方法之一。温度作用是混凝土连续梁悬臂施工中需要考虑的重要荷载,温度效应对混凝土连续梁的安全性能和施工质量有重要影响。本文在对混凝土板件温度场长期观测的基础上,分析研究了混凝土内温度场的特点,并通过数值模拟的方法计算分析了一座实际连续梁悬臂施工中六种温度梯度作用下的应力和变形。主要研究内容包括：(1)分析北京地区混凝土板内部温度在春、夏、秋、冬四季的变化情况,应用数值分析方法对混凝土板温度场进行模拟分析。对数值模拟数据与实测数据进行对比验证,为利用ANSYS软件对混凝箱梁温度场及温度效应计算奠定基础。(2)通过实测和数值分析的方法分别对环境最高温度和环境温差对混凝土内部竖向温差的影响进行了分析,分析表明环境温差对混凝土内部竖向温差的影响比环境最高温度的影响更大。(3)通过对苏州地区2011年到2015年各月份最大温差的统计,利用ANSYS软件计算分析了苏州地区在春夏秋冬四季中每个季节最大环境温差下混凝土箱梁的温度梯度。(4)利用有限元软件进行数值模拟,分析一座(70+125+70)m连续梁在本文研究的温度梯度及铁路规范中的温度梯度作用下,在最大悬臂、边跨合龙后、中跨合龙后三个施工工况下的应力和变形。(5)为方便施工过程中的数据管理和梁体应力及变形控制,编写开发了一种具有输入、查找、删除、计算绘图等多个功能的数据管理软件。
[Abstract]:Prestressed concrete continuous beam is widely used in bridge construction because of its large stiffness, good integrity, smooth running and simple maintenance. Cantilever construction of continuous beam overcomes the limitation of unfavorable natural conditions such as topography, river and so on, and is one of the more common construction methods for construction of prestressed concrete continuous beam. The temperature effect is an important load to be considered in the cantilever construction of concrete continuous beam, and the temperature effect has an important influence on the safety performance and construction quality of the concrete continuous beam. On the basis of long-term observation of temperature field of concrete slab, the characteristics of temperature field in concrete are analyzed and studied in this paper. The stress and deformation under the action of six temperature gradients in the cantilever construction of a practical continuous beam are calculated and analyzed by numerical simulation. The main research contents include: (1) to analyze the variation of internal temperature of concrete slabs in spring, summer, autumn and winter in Beijing area, and to simulate and analyze the temperature field of concrete slabs by numerical analysis method. The numerical simulation data are compared with the measured data. In order to make use of ANSYS software to calculate the temperature field and temperature effect of concrete box girder, the effects of maximum ambient temperature and environmental temperature difference on the vertical temperature difference of concrete are analyzed by means of actual measurement and numerical analysis, respectively. The analysis shows that the influence of environmental temperature difference on the vertical temperature difference of concrete is greater than that of environmental maximum temperature. The temperature gradient of concrete box girder in the spring, summer, autumn, winter and four seasons in Suzhou area under the maximum ambient temperature difference in the spring, summer, autumn and winter is calculated and analyzed by ANSYS software. 4) the finite element software is used to simulate the temperature gradient of the concrete box girder. Under the temperature gradient studied in this paper and the temperature gradient in the railway code, the maximum cantilever and side span of a continuous beam with a span of 70 125 70 m are analyzed. For the convenience of data management and beam stress and deformation control in the construction process, a kind of method with input, search and deletion is developed. Data management software for calculating drawing and other functions.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U441.5;U445

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