舟曲城江桥灾后状态评估与加固技术研究
发布时间：2019-07-01 13:03
【摘要】：目前，我国的桥梁有一部分是不健康的，或多或少是有病害的。尤其是面对突如其来的自然灾害，其对桥梁的破坏是不可避免的。这样的情况也不时地发生，如何去处理就是桥梁工作者需要解决的问题了。对破坏后的桥梁做出准确的评估就显得至关重要了，因为这可以给出怎么处理这座桥梁的方案或措施。一般情况对破坏的桥梁都要进行加固，选取一个合理的加固方案至关重要。因此对桥梁进行病害分析，并进行桥梁的状态评估，进而对加固技术的研究具有非常重要的意义。 本文以2008年发生泥石流后的舟曲县城江桥为研究背景，舟曲城江桥上部结构为主跨70米的钢筋混凝土桁架拱桥，桥梁全长103.5米，桥宽9.5米。主桥采用重力式C15片石混凝土桥台，，采用三台阶片石混凝土的扩大基础。发生泥石流后，建设厅迅速召集国内桥梁的专家对桥梁进行灾后评估，以判断桥梁的安全性能否满足使用要求。专家组根据检测评估结果以及实际情况确定了加固方案：拱肋进行粘贴钢箱梁加固，提高桥梁承载力；在全桥上部原有横系梁梁底粘贴钢板加固，在主拱肋上新增7根横系梁，增强全桥横向联系，使全桥形成框架结构，增强桥梁结构整体性；悬臂板、悬臂梁粘贴钢板加固，提高其承载力和刚度使其满足荷载要求；节点进行钢套箍加固，增大其局部承载力；上弦杆底部粘钢加固，提高其承载力和刚度。专家组并且提出了注意的的主要问题：维修加固采用原荷载标准汽-20级；主拱肋采用上下对称钢箱加固方法；加强桥梁的整体性和抗震性能；加固桥面板时应加强上部构件的横向连接。 本文依据《公路桥梁技术状况评定标准》对桥梁进行了技术状况评估，根据《公路桥梁承载能力检测评定规程》对桥梁进行了承载能力评估。还通过可靠度理论评估了桥梁的承载能力。通过对舟曲城江桥的技术状况评估，得出桥梁的缺损状况比较严重；通过这两种方法的承载能力评估，都得出了发生泥石流后的舟曲城江桥的承载能力都不满足要求。通过对钢箱加固设计的研究，分析了此加固方法的优点及合理性。并且通过桥梁荷载试验，分析了加固后的桥梁的实际性能的提高和改善。最后对比了桥梁加固前后的力学性能和动力特性，比较结果显示，各种性能都提高了不少。并且通过实验论证了本加固方案的带来的良好加固效果。
[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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.7
【相似文献】
相关期刊论文 前10条
1 ;岐江桥——城市的印记[J];珠江水运;2012年05期
2 付宝利,沈秋香,任仰运,张希德;江桥站与白沙滩站枯水位相关分析[J];黑龙江水利科技;1998年01期
3 闻钟;;品牌塔机再造哈尔滨江桥百年丰碑[J];建设机械技术与管理;2011年08期
4 李晋文,黄兵;西江桥加固技术[J];江西煤炭科技;2005年01期
5 刘汉臣，陈玉敏，郑贵和;江桥水文站水位流量关系曲线高水延长方法[J];黑龙江水专学报;1996年01期
6 _5良
本文编号：2508497
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2508497.html
