【摘要】：改革開放以來，我國橋梁建設(shè)領(lǐng)域取得了豐碩的成果。但是，在不斷建設(shè)新橋的同時(shí)，大量的舊橋急需進(jìn)行加固，尤其是在一些縣鄉(xiāng)低等級公路中，大量的中小跨徑橋梁由于設(shè)計(jì)荷載不足且缺乏維修保養(yǎng)，橋梁承載能力堪憂。如果能夠找到一種適用于中小跨徑橋梁的性價(jià)比最高的加固方法，不僅可以大量的節(jié)約投資，有效的利用資源，而且可以取得更好的社會效益。 本文以南京石臼橋?yàn)槔瑢蛄荷喜拷Y(jié)構(gòu)加固方案進(jìn)行了研究，主要內(nèi)容包括：1、探討了如何對舊橋承載能力進(jìn)行鑒定；2、用Midas civil軟件對橋梁的加固目標(biāo)進(jìn)行了計(jì)算；3、以《公路橋梁加固設(shè)計(jì)規(guī)范》為依據(jù)，分別采用增大截面法，粘貼鋼板法，粘貼碳纖維法，體外預(yù)應(yīng)力法，對南京石臼橋進(jìn)行了加固方案設(shè)計(jì)；4、用ANSYS軟件對橋梁加固效果進(jìn)行了有限元分析；5、運(yùn)用價(jià)值工程對加固方案進(jìn)行功能成本分析，綜合考慮了施工成本，封閉交通成本，維護(hù)成本，選擇了該橋性價(jià)比最高的加固方案。 最后，本文給出了結(jié)論：1、增大截面法不僅承載力提高系數(shù)大，施工成本和維護(hù)成本也是最低的，，當(dāng)交通量不大，可以不考慮封閉交通造成的影響時(shí)，增大截面法將是一種性價(jià)比最高的加固方法。2、粘貼鋼板法，在現(xiàn)階段中小跨度簡支梁橋加固中，當(dāng)封閉交通造成的影響必須加以考慮時(shí)，粘貼鋼板加固法是一種性價(jià)比最高的加固方法，而且施工技術(shù)簡單，便于推廣。3、粘貼碳纖維法，其施工成本較高，但是后期的維護(hù)成本較少，僅次于增大截面法，當(dāng)需要封閉交通時(shí)，其也是一種方便快捷的加固方法。不足之處在于，由于自身強(qiáng)度無法得到充分發(fā)揮，對結(jié)構(gòu)承載力提高幅度是受限的。如果能夠?qū)μ祭w維布施加預(yù)應(yīng)力，則可以大幅提高結(jié)構(gòu)的承載能力，那時(shí)粘貼碳纖維布將成為一種性價(jià)比最高的加固方法。4、體外預(yù)應(yīng)力加固通過改變原結(jié)構(gòu)受力體系，可以極大的增強(qiáng)原結(jié)構(gòu)承載能力，而且維護(hù)費(fèi)用要低于粘貼鋼板法，也是一種性價(jià)比很高的加固方法，不足之處是對于原橋的材料強(qiáng)度現(xiàn)狀要求較高，尤其是錨板處，轉(zhuǎn)向塊的位置，將存在很大的應(yīng)力集中現(xiàn)象，可能會出現(xiàn)局部破壞，導(dǎo)致整個(gè)結(jié)構(gòu)破壞。在一些結(jié)構(gòu)保存較好的橋梁加固中，體外預(yù)應(yīng)力加固將是可以與粘貼鋼板法媲美的性價(jià)比最高的加固方法。5、隨著科學(xué)技術(shù)的發(fā)展，中小跨度橋梁的最優(yōu)加固方案也會不斷發(fā)生變化。但是，仍然可以通過價(jià)值工程進(jìn)行功能成本分析的方法來對具體的橋梁加固案例來研究，選擇一種性價(jià)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.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.72

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 孫曉燕,黃承逵,孫保沭;既有橋梁外貼纖維布加固后可靠度分析[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年03期

2 郭曉魁;宋玉恒;;碳纖維加固T形橋梁技術(shù)研究及應(yīng)用[J];河北工業(yè)大學(xué)學(xué)報(bào);2008年06期

3 朱正偉,劉東燕,彭文軒;體外預(yù)應(yīng)力技術(shù)在橋梁加固中應(yīng)用的思考[J];重慶建筑大學(xué)學(xué)報(bào);2005年02期

本文編號：2190319