大跨曲线钢箱梁桥若干关键技术研究
发布时间：2019-03-03 15:13
【摘要】：钢箱梁桥因其跨越能力强、工厂加工制造速度快、施工对桥下交通影响小等优点常用于城市高架桥、城市立交匝道桥中，然而在钢箱梁的设计、建设和使用过程中仍存在一些亟需解决的关键问题。本文以台州互通式立交匝道上的曲线钢箱梁桥设计为依托，探讨、分析大跨曲线钢箱梁桥设计中的关键技术问题，为大跨曲线钢箱梁桥的设计与建造提供技术支撑。 本文具体工作内容如下： 1.曲线钢箱梁桥结构自重较轻，后期运营过程中存在偏载，倾覆稳定性已经成为控制小半径曲线钢箱梁设计的关键。本文介绍了钢箱梁桥频繁出现的倾覆灾害，对桥梁倾覆问题进行分析，阐述了抗倾覆系数的计算原理。采用Madis/Civil建模进行参数化分析，研究影响钢箱梁抗倾覆稳定性的因素并提出提高钢箱梁抗倾覆的若干措施。通过对台州立交典型曲线钢箱梁桥的抗倾覆稳定性的计算分析，提出了设计改进措施。 2.钢桥面板的疲劳问题是钢箱梁桥设计中应重点关注的技术问题。钢箱梁桥U肋通过横隔板处挖孔位置疲劳细节较多，易于疲劳开裂。本文建立三维有限元模型，对钢箱梁正交异性桥面板挖孔型式进行了参数化分析，对比了四种常用的U肋挖孔型式的疲劳性能，并对横隔板高度、板件厚度对挖孔处疲劳性能的影响做了分析。 3.钢箱梁桥面铺装易破损，，影响钢箱梁桥的耐久性和后期维护成本。本文分析了正交异性钢桥面板桥面铺装与公路面层的受力区别，以及病害形成机理的差异性。针对钢桥面铺装病害特征，提出了有效解决常见病害的组合铺装层形式。采用有限元计算，对比分析了三种铺装层对钢桥面板疲劳应力水平的影响，结果表明组合铺装层可显著降低钢桥面板疲劳应力水平，延长钢桥面板的使用使用寿命，解决钢桥面铺装易损性问题。 4.钢结构桥梁的防腐问题是控制钢箱梁桥推广使用的技术瓶颈之一，耐候钢的合理应用可有效解决钢桥的防腐维护问题。本文探讨了耐候桥梁钢的耐腐蚀机理，对我国生产的耐候桥梁钢的耐候性进行了对比分析。结合工程设计实例，对耐候钢的涂装方式、设计与施工工艺要点进行了分析，总结、提出了工程实施建议。
[Abstract]:Steel box girder bridge is often used in urban viaduct and on-ramp bridge because of its strong span ability, high manufacturing speed of factory and small influence of construction on traffic under the bridge. However, in the design of steel box girder, the steel box girder is used in the design of steel box girder. There are still some key problems that need to be solved in the process of construction and use. Based on the design of curved steel box girder bridge on the ramp of Taizhou interchange, this paper discusses the key technical problems in the design of long span curved steel box girder bridge, and provides technical support for the design and construction of long span curved steel box girder bridge. The specific contents of this paper are as follows: 1. The structure of curved steel box girder bridge is light in weight and there is bias load in the later operation process. The overturning stability has become the key to control the design of small radius curved steel box girder. In this paper, the frequent overturning disasters of steel box girder bridges are introduced, the overturning problems of bridges are analyzed, and the calculation principle of anti-capsizing coefficient is expounded. The parametric analysis of steel box girder is carried out by using Madis/Civil modeling. The factors affecting the anti-overturning stability of steel box girder are studied and some measures to improve the overturning resistance of steel box girder are put forward. Based on the calculation and analysis of the anti-overturning stability of the typical curved steel box girder bridge of Taizhou interchange, the design improvement measures are put forward. 2. Fatigue problem of steel bridge deck is a technical problem which should be paid attention to in the design of steel box girder bridge. The fatigue details of the U-rib position of the steel box girder bridge through the transverse partition plate are more detailed and easy to fatigue cracking. In this paper, a three-dimensional finite element model is established, and the parametric analysis of the hole-digging pattern of orthotropic bridge deck of steel box girder is carried out. The fatigue properties of four commonly used U-rib hole-digging types are compared, and the height of the transverse diaphragm is analyzed. The effect of the plate thickness on the fatigue behavior of the excavated hole is analyzed. 3. Steel box girder deck pavement is easily damaged, which affects durability and maintenance cost of steel box girder bridge. In this paper, the difference between orthotropic steel deck pavement and highway deck is analyzed, as well as the difference of disease formation mechanism. In view of the disease characteristics of steel bridge deck pavement, this paper puts forward the composite pavement form which can effectively solve the common diseases. The influence of three kinds of pavement on the fatigue stress level of steel bridge deck is analyzed by finite element method. The results show that the composite pavement can significantly reduce the fatigue stress level of steel bridge deck and prolong the service life of steel bridge deck. To solve the vulnerability problem of steel bridge deck pavement. 4. The anticorrosion problem of steel structure bridge is one of the technical bottlenecks to control the popularization and application of steel box girder bridge. The reasonable application of weathering steel can effectively solve the problem of corrosion protection and maintenance of steel bridge. In this paper, the corrosion resistance mechanism of weatherproof bridge steel is discussed, and the weatherability of weather-resistant bridge steel produced in China is compared and analyzed. Combined with engineering design examples, the main points of coating mode, design and construction technology of weatherproof steel are analyzed, summarized, and some suggestions for engineering implementation are put forward.
【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】：U448.213
本文编号：2433815
[Abstract]:Steel box girder bridge is often used in urban viaduct and on-ramp bridge because of its strong span ability, high manufacturing speed of factory and small influence of construction on traffic under the bridge. However, in the design of steel box girder, the steel box girder is used in the design of steel box girder. There are still some key problems that need to be solved in the process of construction and use. Based on the design of curved steel box girder bridge on the ramp of Taizhou interchange, this paper discusses the key technical problems in the design of long span curved steel box girder bridge, and provides technical support for the design and construction of long span curved steel box girder bridge. The specific contents of this paper are as follows: 1. The structure of curved steel box girder bridge is light in weight and there is bias load in the later operation process. The overturning stability has become the key to control the design of small radius curved steel box girder. In this paper, the frequent overturning disasters of steel box girder bridges are introduced, the overturning problems of bridges are analyzed, and the calculation principle of anti-capsizing coefficient is expounded. The parametric analysis of steel box girder is carried out by using Madis/Civil modeling. The factors affecting the anti-overturning stability of steel box girder are studied and some measures to improve the overturning resistance of steel box girder are put forward. Based on the calculation and analysis of the anti-overturning stability of the typical curved steel box girder bridge of Taizhou interchange, the design improvement measures are put forward. 2. Fatigue problem of steel bridge deck is a technical problem which should be paid attention to in the design of steel box girder bridge. The fatigue details of the U-rib position of the steel box girder bridge through the transverse partition plate are more detailed and easy to fatigue cracking. In this paper, a three-dimensional finite element model is established, and the parametric analysis of the hole-digging pattern of orthotropic bridge deck of steel box girder is carried out. The fatigue properties of four commonly used U-rib hole-digging types are compared, and the height of the transverse diaphragm is analyzed. The effect of the plate thickness on the fatigue behavior of the excavated hole is analyzed. 3. Steel box girder deck pavement is easily damaged, which affects durability and maintenance cost of steel box girder bridge. In this paper, the difference between orthotropic steel deck pavement and highway deck is analyzed, as well as the difference of disease formation mechanism. In view of the disease characteristics of steel bridge deck pavement, this paper puts forward the composite pavement form which can effectively solve the common diseases. The influence of three kinds of pavement on the fatigue stress level of steel bridge deck is analyzed by finite element method. The results show that the composite pavement can significantly reduce the fatigue stress level of steel bridge deck and prolong the service life of steel bridge deck. To solve the vulnerability problem of steel bridge deck pavement. 4. The anticorrosion problem of steel structure bridge is one of the technical bottlenecks to control the popularization and application of steel box girder bridge. The reasonable application of weathering steel can effectively solve the problem of corrosion protection and maintenance of steel bridge. In this paper, the corrosion resistance mechanism of weatherproof bridge steel is discussed, and the weatherability of weather-resistant bridge steel produced in China is compared and analyzed. Combined with engineering design examples, the main points of coating mode, design and construction technology of weatherproof steel are analyzed, summarized, and some suggestions for engineering implementation are put forward.
【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】：U448.213
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