【作者】 张观树；

【导师】 邓志恒； 罗吉智；

【作者基本信息】 广西大学 ， 建筑与土木工程， 2007， 硕士

【摘要】 预应力混凝土连续刚构桥梁由于具有结构刚度大、变形小、承载能力强、施工便利快捷等优点，在现代大跨度桥梁结构中被广泛采用。大跨径预应力混凝土连续刚构桥梁目前主要采用悬臂浇筑法施工，在施工过程中，已建成梁段的线形在后期施工中是不可调节的，因此为保证大桥的合龙精度以及大桥成桥后(长期收缩徐变完成后)的线型及内力符合设计要求，必须对大桥施工过程进行有效控制。本文以螺丝岭柳江特大桥为工程背景，阐述了大跨径连续刚构桥梁施工控制的原理、内容、方法，重点研究了主梁结构参数的敏感性和施工过程的仿真计算方法，分析了影响施工控制的主要因素和关键技术，并介绍了螺丝岭柳江特大桥的施工监控的实施情形，为今后同类型桥梁的设计、施工、监控提出了合理的建议。全文共分七章，第一章介绍预应混凝土连续刚构桥的特点及在国内外桥梁界的应用现状，阐述了桥梁施工控制的重要性及桥梁施工控制在国内外的研究现状，说明本文研究的目的及意义。第二章主要介绍了施工控制的内容及任务、常用的施工控制方法、施工系统的组成、桥梁施工控制的影响因素、桥梁施工控制常用的结构状态预测方法、桥梁施工控制的常用仪器设备等，这是成功实施施工控制必备的基础知识。第三章引入本文研究的工程背景，主要介绍螺丝岭柳江特大桥的设计技术标准、设计参数、主要材料、主桥的施工方案。第四～第六章为本文的核心部分。为了在施工控制中有的放矢，达到事半功倍的效果，必须在实施控制前找出施工控制的主要影响因素，剔除次要因素，因此在第四章对螺丝岭柳江特大桥设计参数敏感性进行分析，通过改变主要参数取值，研究参数误差对预应力混凝土连续刚构桥梁结构挠度及应力的影响程度大小，识别出施工控制的主要参数，然后对目前的主要参数识别方法进行了分析比较，指出了其局限性，提出了直接采用现场实测参数值修正模型参数值的建议。第五章利用GQJS建立有限元模型，采用正装计算法，模拟螺丝岭柳江特大桥施工的实际进程，计算各施工阶段理想状态的应力及位移，形成控制文件，作为施工控制的基础数据。第六章介绍了螺丝岭柳江特大桥的施工监控的实施过程，重点对大桥主梁各施工工况下的应力、挠度的实测值与理论值进行对比分析，研究导致实测值与理论值偏差的主要原因，并通过大桥的顺利合龙证明了施工控制的正确性、监测及其对数据分析处理的合理性。本文最后，总结螺丝岭柳江特大桥的施工控制经验与体会，对今后同类型桥梁的设计、施工、监控提出合理的建议，指出本文研究中存在的不足，展望今后进一步研究的方向。更多还原

【Abstract】 At present, pre-stressed concrete continuous rigid-frame bridges are widely adopted inlong-span bridge for their good mechanical behavior and good load-bearing ability,construction rapidness and convenience. Cast-in -place cantilever method is mainly used toconstruct long-span pre-stressed concrete continuous rigid-frame bridges. Once a segment ofthe main beam has been erected, the linear of the segment can not be change in theconstruction stages behind. To make sure the closing-join precision and the linear, also theinternal forces, of the bridges is meeting the need of design and keeping the ideal alignmentand internal forces when the construction completed (after shrinkage and creep finishes), it isnecessary to execute construction control effectively during construction of bridge.Based on the construction control and monitoring project of Luosiling Liu-River majorbridge, the principles, methods and contents of construction control are discussed in this paper.More attention is paid to the study of the structure parametric sensitivity for the main beamand the ways to simulate the construction process. The key technology and the main influentfactors of construction control are listed. Reasonable advice for design, construction andmonitoring of the same kind of bridge is put forward after the practical construction control ofLuosiling Liu-River bridge has been introduced.The thesis consists of seven chapters. In the first chapter, the characteristics, the status quoof adoption at domestic and abroad, for pre-stressed concrete continuous rigid-frame bridge,are listed. The importance of bridge construction control and the study level of the subject athome and overseas are expatiated. The aim and the research significance of the paper areintroduced in the end.In Chapter Two, the basic kNowledge of bridge construction control which is necessary toexecute construction control successfully, such as the tasks of construction control, themainly methods, how the system is made up of, the main influent factors, the main ways toforecast the structure states, apparatus and equipment in common use etc, are listed.The construction project of Luosiling Liu-River major bridge is introduced in the thirdchapter, including the design standard, the design parameters, the main material, theconstruction scheme of the main bridge. Chapter Four to Six are the kern parts of the thesis. To have a definite object in view andget twice the result with half the effort in the construction control of bridge, the main influentfactors of construction control must be searched out, and the subordination factors must beeliminated. So in Chapter Four, sensitivity of the design parameters for Luosiling Liu-Rivermajor bridge is analyzed. The influences of parameter error to the deflection and stress ofbridges structure are studied by changing the main parameter. Then the methods of parametersidentification mainly used today are analyzed and compared with each other, and thelimitations of these methods are pointed out. Advice is presented, which is adopting measuredparameters to modify calculated parameters directly during construction control. In ChapterFive, a bridge structure analysis software, GQJS, is used to create a finite element model tosimulate Luosiling Liu-River major bridge actual construction process by means ofprogressive calculation. Construction control documents, used as basic datum duringconstruction control, come into being after the stress and deformation of every constructionstage attained by calculating from the model. The construction control and monitoringpractice of Luosiling Liu-River major bridge is introduced in Chapter Six. An emphasis is puton the comparison between the measured value and the theoretic value of the stresses anddeflections for each construction stage of the main beam. Researches have been done to findout the main causes that bring the margin between the measured value and the theoretic value.The reasonability of the inspection and its data analysis handling and correctness ofconstruction control have been proved by the closure smoothly of the bridge.In the seventh chapter of the thesis, the successful experience and cognition of theconstruction control for Luosiling Liu-River major bridge are summarized. Some suggestionsfor the design, construction, monitoring of the same kind of bridge in the future is put forward.Finally, the deficiencies in the thesis and the direction of further study in the future arepointed out.更多还原