矮塔斜拉体系加固预应力混凝土T型刚构桥施工控制

发布时间：2018-01-17 18:01

本文关键词：矮塔斜拉体系加固预应力混凝土T型刚构桥施工控制　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：在旧桥加固过程中,施工荷载、温度的变化以及结构体系调整等均可能导致原有结构内力与线形的变化,影响后加构件的施工质量,使原桥产生更严重的病害,有时可能会危及结构安全。为了保证桥梁加固施工安全并最终实现加固设计理想状态,通过对加固施工过程进行跟踪监测和分析,及时调整施工监控指令是非常有必要的。本文结合某座预应力混凝土T型刚构桥加固施工全过程,开展混凝土桥梁加固施工监控技术研究。某一四跨PC T型刚构桥,带有挂梁,因超载现象及自然条件变化等使该桥出现了悬臂端严重下挠、箱梁局部开裂、桥面系损坏等病害,严重影响桥梁的正常使用。技术现状决定采用矮塔斜拉体系对该桥进行加固。针对每个T构采用矮塔斜拉桥加固,增大桥墩横截面尺寸,对裂缝粘贴碳纤维布并重新浇筑桥面铺装。为了保证加固成桥后的内力和线形满足加固设计要求,本文运用桥梁专用软件对旧桥结构进行了实际受力状态分析,模拟分析了旧桥施工成桥状态和砼收缩徐变影响下的应力及变形,并在此基础上通过在各控制截面关键位置布置相应的传感器,将各工况下传感器所测得的实测数据与理论数据进行对比分析,并与相关规定作对比,使整个加固施工过程处于可控范围内,以此来保证加固施工过程的安全以及工程质量。最后通过对比分析加固后的荷载试验实测数据与计算数据,表明经过加固桥梁结构的强度和刚度有了很大程度地提高和改善,说明桥梁结构加固设计效果较好。
[Abstract]:In the process of strengthening the old bridge, the change of construction load, temperature and structural system adjustment may lead to the change of internal force and line shape of the original structure, which will affect the construction quality of the post-added members and make the original bridge produce more serious diseases. In order to ensure the safety of bridge reinforcement construction and finally realize the ideal state of reinforcement design, the process of strengthening construction is monitored and analyzed. It is necessary to adjust the construction monitoring instruction in time. This paper combines the whole process of strengthening a prestressed concrete T-shaped rigid frame bridge. Research on the monitoring technology of concrete bridge strengthening construction. A four-span PC T rigid frame bridge with hanging beam, due to overload phenomenon and natural conditions change, the bridge appears the cantilever end of the serious deflection, box girder local cracking. Bridge deck damage and other diseases seriously affect the normal use of the bridge. The technical status of the bridge decided to use a low tower cable-stayed system to strengthen the bridge. For each T-structure the use of low-tower cable-stayed bridge reinforcement to increase the cross-section size of pier. In order to ensure that the internal force and line shape of the reinforced bridge meet the requirements of the design, the actual stress state of the old bridge structure is analyzed by using the special software of the bridge. The stress and deformation of the old bridge under the influence of the bridge state and concrete shrinkage and creep are simulated and analyzed. On this basis, the corresponding sensors are arranged at the key positions of each control section. The measured data measured by the sensor under each working condition are compared with the theoretical data, and compared with the relevant regulations, so that the whole reinforcement construction process is in a controllable range. In order to ensure the safety of the reinforcement construction process and the quality of the project. Finally, through the comparative analysis of the strengthened load test data measured and calculated data. It is shown that the strength and stiffness of the strengthened bridge structure have been greatly improved, which indicates that the design effect of the bridge structure strengthening is better.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72

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