简支变连续T梁桥翼缘板防裂对策研究

发布时间：2018-05-14 02:20

本文选题：简支变连续 + T梁桥　；参考：《长安大学》2014年硕士论文

【摘要】：本文通过总结国内外关于混凝土桥梁的裂缝研究概况，发现预应力混凝土桥梁裂缝研究多集中于悬臂现浇法、满堂支架现浇法等一些现场制作构件的桥梁，而对于公路桥梁中占据大部分数量的装配式预应力混凝土桥梁研究较少。经过对福建省混凝土桥梁裂缝病害的调研发现，装配式预应力混凝土桥梁在服役若干年后出现了不少裂缝病害，，严重降低了桥梁的耐久性及使用性能。以福建省某简支变连续T梁桥为依托工程，将桥面翼缘板为研究对象，概括了工程界常用的分析研究混凝土开裂的数学模型和开裂判断准则，其中包括空间应力状态的描述和强度理论，归纳了T梁桥翼缘板上裂缝病害的形式并分析了可能的原因。选择预应力损失和翼缘板厚度两个方面，建立ANSYS有限元模型，分析其对翼缘板应力状态的影响规律。研究结果表明：预应力分别损失对翼缘板顶面中心处、翼缘板加腋与腹板交接处应力增加贡献最大；随着预应力损失的增大，翼缘板加腋与腹板交接处应力增加的速率变大；随着翼缘板厚度变化，翼缘板顶面中心处、翼缘板加腋与腹板交接处应力变化幅度较大，其他点处应力变化非常小；翼缘板厚度为16cm时边跨、中跨的跨中截面翼缘板顶面中心处应力出现峰值，较其他工况大很多；随着翼缘板加厚，边跨支点截面顶面中心处、翼缘板加腋与腹板交接处应力变化曲线斜率由大变小。最后本文从施工和运营两方面，对T梁翼缘板混凝土提开裂控制措施，并介绍了混凝土裂缝修补方法。
[Abstract]:This paper summarizes the research situation of cracks in concrete bridges at home and abroad, and finds out that the research on cracks of prestressed concrete bridges is mainly focused on cantilever cast-in-place method, cast-in-situ method of full support, and so on. However, there is little research on the prestressing concrete bridge which accounts for most of the highway bridges. Through the investigation and investigation of cracks in concrete bridges in Fujian Province, it is found that there are many cracks in prestressing concrete bridges in service for several years, which seriously reduces the durability and performance of the bridges. Based on a simply supported and continuous T-beam bridge in Fujian Province, the flange slab of bridge deck is taken as the research object, and the mathematical model and criterion of cracking analysis and research in engineering field are summarized. Including the description of spatial stress state and strength theory, the form of crack on flange plate of T-beam bridge is summarized and the possible causes are analyzed. The ANSYS finite element model is established to analyze the influence of prestressing loss and flange plate thickness on the stress state of flange plate. The results show that the stress increase at the junction of flange plate and axillary plate is the greatest contribution to the stress increase of the flange plate at the center of the top surface of the flange plate, and with the increase of the prestress loss, the rate of stress increase at the junction between the flange plate and the axillary plate and the web plate increases with the increase of the prestress loss. With the change of flange plate thickness, the stress changes at the center of the flange plate top surface, the flange plate plus axillary and web interface are larger, and the stress changes at other points are very small, and the flange plate thickness is 16cm when the edge span, the thickness of the flange plate is the same as that of the flange plate. The stress at the center of the top surface of the mid-span flange plate has a peak value, which is much larger than that of other conditions, and with the flange plate thickening, the slope of the stress curve changes from large to small at the center of the top plane of the side span fulcrum section and the junction between the flange plate and the web plate. Finally, the paper introduces the crack control measures of T-beam flange slab concrete from two aspects of construction and operation, and introduces the concrete crack repair method.
【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】：U441.6

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