【作者】 赵玉银；

【导师】 强士中；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 近二十年来,预应力混凝土连续刚构桥得到了很快发展。连续刚构桥梁墩固结,既保持了连续梁行车平顺舒适的优点,又保持了T型刚构不设支座减少养护工作量的优点。该桥型以强度高、线形明快、施工简便快捷、跨越能力强的优势在大跨度桥梁中得到了越来越广泛的应用。预应力混凝土连续刚构桥常常采用经济合理、方便快捷的悬臂现浇施工法。在悬臂施工过程中,桥梁结构受多种因素的影响,如混凝土的收缩、徐变、设计参数与实际数值的差异、施工误差、测量误差、温度变化等。在这些因素影响下,采用悬臂施工方法必然给桥梁结构带来较为复杂的内力和位移的变化。为了保证桥梁施工质量和施工安全,确保连续梁桥成桥后的主梁线形和结构内力符合设计要求,使连续刚构桥的实际状态最大限度地趋近设计状态,桥梁施工控制是必不可少的环节和措施。本文以关口垭3号桥为工程背景,针对大跨度连续刚构桥的施工情况,以确保施工中结构线形与理想施工状态线形一致,内力、挠度均在允许误差范围之内为目的,结合实际,建立合理的计算分析模型模拟施工过程。研究施工预拱度控制的结构计算和误差调整方法,对该桥进行了施工过程的正装模拟计算,研究了采用悬臂拼装施工的大跨度预应力混凝土连续刚构桥的施工过程。本文采用桥梁通用有限元软件桥梁博士和MIDAS,结合该桥特点,运用有限单元法建立了平面杆系模型。阐述了混凝土收缩、徐变以及温度变化机理以及计算理论和方法。基于这些理论,研究了混凝土收缩、徐变以及温度变化在连续刚构桥施工控制中的影响。其结果已在关口垭3号桥施工控制中得到了应用,并对其它同类桥梁的施工控制有着参考价值。更多还原

【Abstract】 In recent twenty years, with the fast development of prestressed concrete continues rigid frame bridge, which has a property of bond of beam and abutment, so not only maintain the advantage of comfort of continue girder, but also decrease maintenance cost because that there is no bearing of "T" beam. Continue rigid frame bridge is more and more widely used because of its high strength, lightful line type, convenient and fast construction, long-span ability.The prestressed concrete continuous rigid frame bridge often adopts the economical and reasonable segmental construction technique with cantilever installation. During the process of the balanced cantilever construction, the bridge structure is influenced by various factors, such as shrinkage, creep and temperature change of concrete, construction error, survey error, and so on. Such factors result in the complex change of the internal forces and displacements in the bridge. It is necessary to execute construction control effectively for bridge’s construction, ensuring of smooth closing join at mid-span, meeting the need of design and keeping the ideal alignment after closing join.In this thesis, we base on the consruction control and monitor project of guan kou ya three bridge. In order to ensure the consistency of practical alignment of structure and ideal alignment, deflection and internal force within the allowable limit, we adopt reasonable computation to analyze the construction process in view of the practical construction of long-span continuous rigid frame bridge. The calculation of construction procedural is carried out, the analysis is made that the construction process of long span prestressed concrete continuous bridge constructed by cantilever erection method.The current finite element software DBRIDGE and MIDAS are adopted, according to the specific character of the bridge, the plane hanger finite element model is established by means of finite element method. This paper explain detailedly the concrete shrinkage, creep and temperature change mechanism, the calculation theories with methods. On the basis of these theories , the affection of the concrete shrinkage , creep and temperature change on the construction supervision is analyzed particularly, the results had been applied on the construction supervision of guan kou ya three Bridge and have the great value to the other similar bridge type.更多还原