舟曲城江橋災后狀態(tài)評估與加固技術研究
發(fā)布時間：2019-07-01 13:03
【摘要】：目前，我國的橋梁有一部分是不健康的，或多或少是有病害的。尤其是面對突如其來的自然災害，其對橋梁的破壞是不可避免的。這樣的情況也不時地發(fā)生，如何去處理就是橋梁工作者需要解決的問題了。對破壞后的橋梁做出準確的評估就顯得至關重要了，因為這可以給出怎么處理這座橋梁的方案或措施。一般情況對破壞的橋梁都要進行加固，選取一個合理的加固方案至關重要。因此對橋梁進行病害分析，并進行橋梁的狀態(tài)評估，進而對加固技術的研究具有非常重要的意義。 本文以2008年發(fā)生泥石流后的舟曲縣城江橋為研究背景，舟曲城江橋上部結構為主跨70米的鋼筋混凝土桁架拱橋，橋梁全長103.5米，橋?qū)?.5米。主橋采用重力式C15片石混凝土橋臺，，采用三臺階片石混凝土的擴大基礎。發(fā)生泥石流后，建設廳迅速召集國內(nèi)橋梁的專家對橋梁進行災后評估，以判斷橋梁的安全性能否滿足使用要求。專家組根據(jù)檢測評估結果以及實際情況確定了加固方案：拱肋進行粘貼鋼箱梁加固，提高橋梁承載力；在全橋上部原有橫系梁梁底粘貼鋼板加固，在主拱肋上新增7根橫系梁，增強全橋橫向聯(lián)系，使全橋形成框架結構，增強橋梁結構整體性；懸臂板、懸臂梁粘貼鋼板加固，提高其承載力和剛度使其滿足荷載要求；節(jié)點進行鋼套箍加固，增大其局部承載力；上弦桿底部粘鋼加固，提高其承載力和剛度。專家組并且提出了注意的的主要問題：維修加固采用原荷載標準汽-20級；主拱肋采用上下對稱鋼箱加固方法；加強橋梁的整體性和抗震性能；加固橋面板時應加強上部構件的橫向連接。 本文依據(jù)《公路橋梁技術狀況評定標準》對橋梁進行了技術狀況評估，根據(jù)《公路橋梁承載能力檢測評定規(guī)程》對橋梁進行了承載能力評估。還通過可靠度理論評估了橋梁的承載能力。通過對舟曲城江橋的技術狀況評估，得出橋梁的缺損狀況比較嚴重；通過這兩種方法的承載能力評估，都得出了發(fā)生泥石流后的舟曲城江橋的承載能力都不滿足要求。通過對鋼箱加固設計的研究，分析了此加固方法的優(yōu)點及合理性。并且通過橋梁荷載試驗，分析了加固后的橋梁的實際性能的提高和改善。最后對比了橋梁加固前后的力學性能和動力特性，比較結果顯示，各種性能都提高了不少。并且通過實驗論證了本加固方案的帶來的良好加固效果。
[Abstract]:At present, some of the bridges in our country are unhealthy and more or less diseased. Especially in the face of sudden natural disasters, the destruction of bridges is inevitable. This kind of situation also happens from time to time, how to deal with is the bridge worker needs to solve the problem. It is important to make an accurate assessment of the damaged bridge, because it can give a plan or measures to deal with the bridge. In general, the damaged bridge should be strengthened, so it is very important to select a reasonable reinforcement scheme. Therefore, it is of great significance to analyze the disease of the bridge and evaluate the state of the bridge, which is of great significance to the study of reinforcement technology. In this paper, based on the research background of Zhouqu County Chengjiang Bridge after debris flow in 2008, the superstructure of Zhouqu City River Bridge is mainly a reinforced concrete truss arch bridge with a span of 70 meters. The bridge is 103.5 meters long and the width of the bridge is 9.5 meters. The main bridge adopts gravity C 15 stone concrete bridge platform and three steps stone concrete expansion foundation. After debris flow, the Construction Department quickly brings together domestic bridge experts to evaluate the post-disaster of the bridge in order to determine whether the safety of the bridge can meet the requirements of use. According to the test and evaluation results and the actual situation, the expert group has determined the reinforcement scheme: the arch ribs are strengthened with steel box girder to improve the bearing capacity of the bridge, the steel plate is pasted to the bottom of the original transverse beam in the upper part of the whole bridge, and seven transverse beams are added to the main arch ribs to strengthen the transverse connection of the whole bridge, so that the whole bridge can form a frame structure and enhance the integrity of the bridge structure. The cantilever plate and cantilever beam are strengthened with steel plate to improve their bearing capacity and stiffness to meet the load requirements; the joint is strengthened with steel hoop to increase its local bearing capacity; the bottom of the upper chord is strengthened with steel to improve its bearing capacity and stiffness. The main problems put forward by the expert group are as follows: the original load standard steam-20 grade is used for maintenance and reinforcement, the upper and lower symmetrical steel box reinforcement method is used for the main arch ribs, the integrity and seismic performance of the bridge are strengthened, and the transverse connection of the upper members should be strengthened when strengthening the bridge deck. In this paper, the technical condition of the bridge is evaluated according to the Technical condition Evaluation Standard of Highway Bridge, and the bearing capacity of the bridge is evaluated according to the Code of Inspection and Evaluation of bearing capacity of Highway Bridge. The bearing capacity of the bridge is also evaluated by reliability theory. Through the evaluation of the technical status of Zhouqu City River Bridge, it is concluded that the defect of the bridge is more serious, and through the evaluation of the bearing capacity of these two methods, it is concluded that the bearing capacity of Zhouqu City River Bridge after debris flow does not meet the requirements. Through the research of steel box reinforcement design, the advantages and rationality of this reinforcement method are analyzed. Through the load test of the bridge, the improvement and improvement of the actual performance of the strengthened bridge are analyzed. Finally, the mechanical and dynamic properties of the bridge before and after reinforcement are compared, and the results show that all kinds of properties have been improved a lot. The good reinforcement effect brought by this reinforcement scheme is demonstrated by experiments.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.7
[Abstract]:At present, some of the bridges in our country are unhealthy and more or less diseased. Especially in the face of sudden natural disasters, the destruction of bridges is inevitable. This kind of situation also happens from time to time, how to deal with is the bridge worker needs to solve the problem. It is important to make an accurate assessment of the damaged bridge, because it can give a plan or measures to deal with the bridge. In general, the damaged bridge should be strengthened, so it is very important to select a reasonable reinforcement scheme. Therefore, it is of great significance to analyze the disease of the bridge and evaluate the state of the bridge, which is of great significance to the study of reinforcement technology. In this paper, based on the research background of Zhouqu County Chengjiang Bridge after debris flow in 2008, the superstructure of Zhouqu City River Bridge is mainly a reinforced concrete truss arch bridge with a span of 70 meters. The bridge is 103.5 meters long and the width of the bridge is 9.5 meters. The main bridge adopts gravity C 15 stone concrete bridge platform and three steps stone concrete expansion foundation. After debris flow, the Construction Department quickly brings together domestic bridge experts to evaluate the post-disaster of the bridge in order to determine whether the safety of the bridge can meet the requirements of use. According to the test and evaluation results and the actual situation, the expert group has determined the reinforcement scheme: the arch ribs are strengthened with steel box girder to improve the bearing capacity of the bridge, the steel plate is pasted to the bottom of the original transverse beam in the upper part of the whole bridge, and seven transverse beams are added to the main arch ribs to strengthen the transverse connection of the whole bridge, so that the whole bridge can form a frame structure and enhance the integrity of the bridge structure. The cantilever plate and cantilever beam are strengthened with steel plate to improve their bearing capacity and stiffness to meet the load requirements; the joint is strengthened with steel hoop to increase its local bearing capacity; the bottom of the upper chord is strengthened with steel to improve its bearing capacity and stiffness. The main problems put forward by the expert group are as follows: the original load standard steam-20 grade is used for maintenance and reinforcement, the upper and lower symmetrical steel box reinforcement method is used for the main arch ribs, the integrity and seismic performance of the bridge are strengthened, and the transverse connection of the upper members should be strengthened when strengthening the bridge deck. In this paper, the technical condition of the bridge is evaluated according to the Technical condition Evaluation Standard of Highway Bridge, and the bearing capacity of the bridge is evaluated according to the Code of Inspection and Evaluation of bearing capacity of Highway Bridge. The bearing capacity of the bridge is also evaluated by reliability theory. Through the evaluation of the technical status of Zhouqu City River Bridge, it is concluded that the defect of the bridge is more serious, and through the evaluation of the bearing capacity of these two methods, it is concluded that the bearing capacity of Zhouqu City River Bridge after debris flow does not meet the requirements. Through the research of steel box reinforcement design, the advantages and rationality of this reinforcement method are analyzed. Through the load test of the bridge, the improvement and improvement of the actual performance of the strengthened bridge are analyzed. Finally, the mechanical and dynamic properties of the bridge before and after reinforcement are compared, and the results show that all kinds of properties have been improved a lot. The good reinforcement effect brought by this reinforcement scheme is demonstrated by experiments.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.7
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