某跨高速分离立交桥结构分析与施工控制技术研究

发布时间：2018-06-17 01:30

本文选题：预应力连续梁 + 悬臂挂篮施工　；参考：《山东大学》2015年硕士论文

【摘要】：随着国民经济的发展,人民生活水平的提高,对高速公路的需求逐年增加,高速立交桥就不可避免地出现,极大缓解了城市交通的压力。预应力混凝土连续梁桥以结构受力性能好、变形小、伸缩缝少、行车平顺舒适、造型简洁美观、养护工程量小、抗震能力强等优势,在跨度100-200m的桥梁中最具竞争力。大跨度连续梁桥多采用悬臂施工工艺,施工过程复杂,影响因素多,成桥状态偏离设计要求的状况时有发生。为确保桥梁良好的线形和合理的受力状态,桥梁的施工控制必不可少。本文以某跨高速公路分离立交桥为工程背景,介绍了某跨高速分离立交桥施工监控的方案；介绍了悬臂挂篮施工过程中的基本理论；建立了大桥有限元结构计算模型,并进行了施工阶段结构分析,有效掌握了大桥各施工阶段的应力和变形状态,为大桥的施工控制提供了可靠的理论依据。本文对施工控制过程中线形的控制进行了重点探讨,根据分离立交桥的工程实际施工进度、箱梁高程变化、混凝土养护时间、施工温度等对实测数据进行修正,在其中考虑了材料参数、施工温度等影响因素。通过高程和应力实际观测值与理论值的比较,研究表明,某跨高速分离立交桥施工控制采用的MIDAS CIVIL有限元仿真模型有效可行,大桥成桥后高程和应力状态满足设计要求,桥梁线形流畅美观,施工监控的任务得以圆满完成。
[Abstract]:With the development of national economy and the improvement of people's living standard, the demand for expressway is increasing year by year, and the expressway overpass will inevitably appear, which greatly alleviates the pressure of urban traffic. Prestressed concrete continuous beam bridge has the advantages of good mechanical performance, small deformation, less expansion joints, smooth driving, simple and beautiful shape, small maintenance, strong seismic capacity, and so on. It is the most competitive in the span of 100-200m bridge. The cantilever construction technology is often used in long-span continuous beam bridges. The construction process is complex and the influence factors are many. The state of the bridge deviates from the design requirements. In order to ensure the good alignment and reasonable stress state of the bridge, the construction control of the bridge is essential. In this paper, based on the engineering background of a separated overpass of a cross-highway, the construction monitoring scheme of a cross-high speed separation overpass is introduced, the basic theory of cantilever hanging basket construction is introduced, and the finite element structure calculation model of the bridge is established. The structure of the bridge in construction stage is analyzed, and the stress and deformation state of each construction stage of the bridge is effectively grasped, which provides a reliable theoretical basis for the construction control of the bridge. In this paper, the linear control in the construction control process is discussed emphatically. According to the actual construction progress of the separated overpass, the change of box girder height, the curing time of concrete, the construction temperature, etc., the measured data are corrected. In which the material parameters, construction temperature and other factors are considered. By comparing the actual observation values of elevation and stress with the theoretical values, the results show that the Midas CIVIL finite element simulation model used in the construction control of a span high speed separation overpass is effective and feasible, and the height and stress state of the bridge after completion meet the design requirements. The line shape of the bridge is smooth and beautiful, and the task of construction monitoring has been successfully completed.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

【引证文献】