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大跨度预应力混凝土斜拉桥施工控制理论与核心技术研究及软件开发

Research on Theory and Key Technologies of Construction Control for Long-Span PC Cable-Stayed Bridges and Sowfware Development

【作者】 徐郁峰

【导师】 韩大建;

【作者基本信息】 华南理工大学 , 结构工程, 2004, 博士

【摘要】 现代斜拉桥的发展虽然起步较晚,但由于其特殊的优越性,在世界各国发展十分迅速。进入二十一世纪后,我国斜拉桥建设在数量、跨度、桥型等方面都有了较大的进展。目前世界前10座最大跨径斜拉桥中,我国占了7座,这充分说明了我国斜拉桥的建设能力已处于世界领先水平。伴随着我国斜拉桥正进入一个新的发展高潮的同时,也对斜拉桥的建设水平提出了更高的要求。 斜拉桥施工控制是连接斜拉桥设计与施工的桥梁,它不仅是斜拉桥建设中的一个关键环节,而且也是斜拉桥建设中实施难度较大的一个环节。提高斜拉桥施工控制技术水平将会产生巨大的工程价值与经济效益。 本文的研究对象是混凝土斜拉桥的施工控制系统,主要工作是施工控制的理论与核心技术的研究以及施工控制系统软件的开发。 本文的研究思路是:根据施工控制的内容把施工控制系统划分为施工过程模拟计算、施工过程测量、施工过程参数识别与施工过程调整4个子系统,然后分别对每个子系统中的理论与核心技术进行了深入的研究,在此基础上研究并开发出施工控制系统软件。 崖门大桥是一座的双塔单索面预应力混凝土斜拉桥,采用牵索挂篮现场浇注施工工艺建造,主跨338米,为亚洲同类型桥梁中的最大跨度。 本文以崖门大桥作为施工控制研究的工程应用实例,在施工控制核心技术研究与软件开发过程中,取得了以下成果: 一、在施工过程模拟计算方面 (1) 牵索挂篮施工模拟计算及施工过程非线性效应的考虑 首先,本文提出一种适用于计算牵索挂篮现浇工法的模拟计算方法,该方法的特点是在模拟计算中考虑挂篮等临时构件的作用,并考虑一个节段施工中的每一个施工细节,从而非常准确地预测在施工下一节段过程中结构的变化。 然后,本文通过引入等效弹性模量及单元等效荷载等概念,推导了杆系结构考虑收缩徐变效应的有限元法增量列式,并给出了流程图。该方法物理概念清晰,程序实现简单,并且能容易地在通用有限元软件中实现。 最后,在前面两项工作基础上,本文把杆系结构几何非线性解法引入分段施工模拟计算中,提出一种能综合考虑几何非线性效应、收缩徐变效应,适用于牵索挂篮施工的分段施工模拟计算方法。 本文提出的分段施工模拟计算方法在崖门大桥实际工程中的成功应用说明了其正确性及工程价值。

【Abstract】 It is well-known that the modern cable-stayed birdge has evolved into the moust popular birdge type all over the world because of its special advantages. Trun into 21 century, our country a great progress has made in the construction of a cable-stayed bridge. At present there are 7 bridges in China amoung the first 10 longest-span cable-stayed bridges in the world. It shows that our country keeps ahead in the construction ability of cable-stayed bridges. With the new wave of cable-stayed bridge construction in our country, the construction capacity of cable-stayed bridge is called for higher level.Function of construction control is a connection between that of the design and construction. It is not noly one of the most important works but also one of the most difficulty works during construction of a cable-stayed bridge. To raise the level of the technologies of construction control have great signifieace for better quality and less expense in bridge construction.The thesis deals with a theory and some research on key technologies of construction control of PC cable-stayed bridges. A software for general use is also developed.First, a construction control system can be divided into 4 subsystems, i.e., simulation analysis subsystem, site measurement subsystem, parameter identification subsystem and adjustment subsystem. And then research is perform on theories and key technologies for each subsystem. Finally, a software for the whole control system is developed and introduced.Yamen cable-stayed Bridge is a prestressed concrete structrue with main span of 338 meters. The bridge has two towers and a single cable-plane. Actually, the birdge has the longest span among all bridges with the same type in Asian.In this work, the research is conducted based on construction control practice of The Yamen Bridge. The theoretical innovations and main technological results are summarized as follows:A, Simulation analysis for on the process of construction(1) Simulation analysis for on the process of construction with form traveler and considering of non-linearity effectsFirst, Simulation analysis method for the process of construction with form traveler is established. In this method, the analogy calculation is considering the effects of form traveler and all sub steps of every segment stage..

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