南京石臼桥上部结构加固方案设计研究
发布时间：2018-08-18 18:29
【摘要】：改革开放以来，我国桥梁建设领域取得了丰硕的成果。但是，在不断建设新桥的同时，大量的旧桥急需进行加固，尤其是在一些县乡低等级公路中，大量的中小跨径桥梁由于设计荷载不足且缺乏维修保养，桥梁承载能力堪忧。如果能够找到一种适用于中小跨径桥梁的性价比最高的加固方法，不仅可以大量的节约投资，有效的利用资源，而且可以取得更好的社会效益。 本文以南京石臼桥为例，对桥梁上部结构加固方案进行了研究，主要内容包括：1、探讨了如何对旧桥承载能力进行鉴定；2、用Midas civil软件对桥梁的加固目标进行了计算；3、以《公路桥梁加固设计规范》为依据，分别采用增大截面法，粘贴钢板法，粘贴碳纤维法，体外预应力法，对南京石臼桥进行了加固方案设计；4、用ANSYS软件对桥梁加固效果进行了有限元分析；5、运用价值工程对加固方案进行功能成本分析，综合考虑了施工成本，封闭交通成本，维护成本，选择了该桥性价比最高的加固方案。 最后，本文给出了结论：1、增大截面法不仅承载力提高系数大，施工成本和维护成本也是最低的，，当交通量不大，可以不考虑封闭交通造成的影响时，增大截面法将是一种性价比最高的加固方法。2、粘贴钢板法，在现阶段中小跨度简支梁桥加固中，当封闭交通造成的影响必须加以考虑时，粘贴钢板加固法是一种性价比最高的加固方法，而且施工技术简单，便于推广。3、粘贴碳纤维法，其施工成本较高，但是后期的维护成本较少，仅次于增大截面法，当需要封闭交通时，其也是一种方便快捷的加固方法。不足之处在于，由于自身强度无法得到充分发挥，对结构承载力提高幅度是受限的。如果能够对碳纤维布施加预应力，则可以大幅提高结构的承载能力，那时粘贴碳纤维布将成为一种性价比最高的加固方法。4、体外预应力加固通过改变原结构受力体系，可以极大的增强原结构承载能力，而且维护费用要低于粘贴钢板法，也是一种性价比很高的加固方法，不足之处是对于原桥的材料强度现状要求较高，尤其是锚板处，转向块的位置，将存在很大的应力集中现象，可能会出现局部破坏，导致整个结构破坏。在一些结构保存较好的桥梁加固中，体外预应力加固将是可以与粘贴钢板法媲美的性价比最高的加固方法。5、随着科学技术的发展，中小跨度桥梁的最优加固方案也会不断发生变化。但是，仍然可以通过价值工程进行功能成本分析的方法来对具体的桥梁加固案例来研究，选择一种性价比最高的加固方案。
[Abstract]:Since reform and opening up, our country bridge construction domain has obtained the rich achievement. However, with the continuous construction of new bridges, a large number of old bridges are in urgent need of reinforcement, especially in some counties and townships on low-grade highways, a large number of small and medium-sized span bridges due to inadequate design load and lack of maintenance, bridge bearing capacity is worrying. If we can find a best cost-effective reinforcement method for medium and small span bridges, we can not only save a lot of investment, use resources effectively, but also get better social benefits. In this paper, taking the Nanjing Shijiu Bridge as an example, the reinforcement scheme of the superstructure of the bridge is studied. The main contents include: 1, how to identify the bearing capacity of the old bridge and how to calculate the reinforcement target of the bridge with Midas civil software; 3. According to the Code for strengthening Design of Highway Bridges, the reinforcement scheme of Nanjing stone mortar bridge is designed by means of increasing section method, sticking steel plate method, affixing carbon fiber method and external prestressing force method. (4) the finite element analysis of bridge reinforcement effect is carried out with ANSYS software, and the function cost of strengthening scheme is analyzed by using value engineering. The construction cost, closed traffic cost and maintenance cost are considered synthetically. The best cost-performance reinforcement scheme is selected. Finally, this paper gives the conclusion that the increasing cross section method not only has a large bearing capacity, but also has the lowest construction cost and maintenance cost. When the traffic volume is small, the influence of closed traffic can not be taken into account. The method of increasing cross-section will be the most cost-effective reinforcement method. The method of sticking steel plate will be considered when the influence caused by closed traffic must be taken into account in the reinforcement of small and medium-sized span simply supported beam bridges at this stage. The bonding steel plate reinforcement method is the most cost-effective reinforcement method, and the construction technology is simple, and it is easy to popularize. 3. The carbon fiber method is easy to be popularized. The construction cost is high, but the later maintenance cost is less, second only to the enlarged section method. When it is necessary to close the traffic, it is also a convenient and fast reinforcement method. The deficiency is that the increase of the bearing capacity of the structure is limited because the strength of the structure can not be given full play. If you can apply prestress to the carbon fiber sheet, you can greatly improve the bearing capacity of the structure, and then sticking the carbon fiber cloth will become the most cost-effective reinforcement method. It can greatly enhance the bearing capacity of the original structure, and the maintenance cost is lower than that of the sticking steel plate method. It is also a high performance-price ratio reinforcement method. The deficiency is that the material strength of the original bridge is required to be high, especially at the anchor plate. In the position of the steering block, there will be a large stress concentration phenomenon, which may result in local failure, resulting in the damage of the whole structure. In some bridges with well-preserved structures, external prestressing reinforcement will be the most cost-effective reinforcement method comparable to the method of sticking steel plates. With the development of science and technology, The optimal reinforcement scheme of medium and small span bridges will also change continuously. However, it is still possible to study the concrete bridge reinforcement cases by the method of functional cost analysis of value engineering, and choose a kind of strengthening scheme with the highest performance-to-price ratio.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72
本文编号：2190319
[Abstract]:Since reform and opening up, our country bridge construction domain has obtained the rich achievement. However, with the continuous construction of new bridges, a large number of old bridges are in urgent need of reinforcement, especially in some counties and townships on low-grade highways, a large number of small and medium-sized span bridges due to inadequate design load and lack of maintenance, bridge bearing capacity is worrying. If we can find a best cost-effective reinforcement method for medium and small span bridges, we can not only save a lot of investment, use resources effectively, but also get better social benefits. In this paper, taking the Nanjing Shijiu Bridge as an example, the reinforcement scheme of the superstructure of the bridge is studied. The main contents include: 1, how to identify the bearing capacity of the old bridge and how to calculate the reinforcement target of the bridge with Midas civil software; 3. According to the Code for strengthening Design of Highway Bridges, the reinforcement scheme of Nanjing stone mortar bridge is designed by means of increasing section method, sticking steel plate method, affixing carbon fiber method and external prestressing force method. (4) the finite element analysis of bridge reinforcement effect is carried out with ANSYS software, and the function cost of strengthening scheme is analyzed by using value engineering. The construction cost, closed traffic cost and maintenance cost are considered synthetically. The best cost-performance reinforcement scheme is selected. Finally, this paper gives the conclusion that the increasing cross section method not only has a large bearing capacity, but also has the lowest construction cost and maintenance cost. When the traffic volume is small, the influence of closed traffic can not be taken into account. The method of increasing cross-section will be the most cost-effective reinforcement method. The method of sticking steel plate will be considered when the influence caused by closed traffic must be taken into account in the reinforcement of small and medium-sized span simply supported beam bridges at this stage. The bonding steel plate reinforcement method is the most cost-effective reinforcement method, and the construction technology is simple, and it is easy to popularize. 3. The carbon fiber method is easy to be popularized. The construction cost is high, but the later maintenance cost is less, second only to the enlarged section method. When it is necessary to close the traffic, it is also a convenient and fast reinforcement method. The deficiency is that the increase of the bearing capacity of the structure is limited because the strength of the structure can not be given full play. If you can apply prestress to the carbon fiber sheet, you can greatly improve the bearing capacity of the structure, and then sticking the carbon fiber cloth will become the most cost-effective reinforcement method. It can greatly enhance the bearing capacity of the original structure, and the maintenance cost is lower than that of the sticking steel plate method. It is also a high performance-price ratio reinforcement method. The deficiency is that the material strength of the original bridge is required to be high, especially at the anchor plate. In the position of the steering block, there will be a large stress concentration phenomenon, which may result in local failure, resulting in the damage of the whole structure. In some bridges with well-preserved structures, external prestressing reinforcement will be the most cost-effective reinforcement method comparable to the method of sticking steel plates. With the development of science and technology, The optimal reinforcement scheme of medium and small span bridges will also change continuously. However, it is still possible to study the concrete bridge reinforcement cases by the method of functional cost analysis of value engineering, and choose a kind of strengthening scheme with the highest performance-to-price ratio.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72
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相关期刊论文 前3条
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2 郭晓魁;宋玉恒;;碳纤维加固T形桥梁技术研究及应用[J];河北工业大学学报;2008年06期
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本文编号：2190319
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