跨浦南高速2号特大桥混凝土连续梁悬臂施工控制研究

发布时间：2018-03-27 23:37

本文选题：混凝土连续梁　切入点：悬臂施工　出处：《兰州交通大学》2014年硕士论文

【摘要】：铁路运输在我国国民经济中处于重要地位，但与此同时，，根据相关公开资料显示，目前我国铁路网仅能满足国内需求的40%左右，铁路运输依然存在明显的瓶颈，铁路运力面临着沉重的压力。中国铁路长期保持着超负荷的运转，迫切需要又快又好地提高。在交通基础设施建设中，桥梁建设的比重很大。如高速铁路客运专线中，桥梁所占比例约为36%，且急需修建更多的大跨度桥梁以跨越公路、铁路、海湾、大河。伴随施工技术的不断发展与创新，施工控制在整个桥梁施工过程中的重要作用也正被越来越多的人所认识。当下我们可以把每座桥梁施工看作是一个系统的工程，对于大跨度预应力混凝土连续梁桥尤其如此。在这个系统中，伴随悬臂现浇施工过程结构始终会受到内在与外在各种因素的耦合干扰，如何对影响误差的系统参数进行有效识别和合理取值，控制每段施工都符合设计要求，这就需要我们对施工全程进行实时监控、有效纠偏。本文结合跨浦南高速2号特大桥连续梁悬臂施工控制的整个过程，对连续梁控制主要做了以下几方面的分析研究：（1）概括了国内外施工控制的发展与现状、施工控制相关内容以及结构计算方法，并且总结了预应力混凝土连续梁桥悬臂施工监控的特点及其重要性。（2）通过MIDAS/Civil对连续梁悬臂浇筑施工过程进行模拟仿真计算。综合考虑了梁段容重、材料弹性模量、热膨胀系数、收缩徐变、施工荷载、三向预应力、结构体系转换和边界条件改变等，借助所建杆系模型，得到主要控制截面在不同施工阶段下的应力和标高。（3）在监控过程中通过设计值、预计值和实测值三者之间的对比分析，对一些计算参数进行准确修正；运用灰色系统理论建立GM(1，1)模型，通过MATLAB自建程序对施工误差进行分析和控制，从而有效预测、调整下一施工梁段的立模预拱度。（4）连续梁桥零号块受力复杂，控制不好很容易在局部出现裂缝，影响结构安全。运用MIDAS/FEA对零号块建立了三维实体模型，计算出零号块分别在最大悬臂施工状态下以及成桥使用状态下的不同应力，对结构细部进行优化。通过对跨浦南高速2号特大桥连续梁悬臂施工监控的相关研究与总结，本文为今后同类混凝土连续梁桥悬臂施工控制方面提供了一定的理论依据与实践支持，保证施工与成桥全程结构安全、可靠。
[Abstract]:Railway transportation plays an important role in China's national economy, but at the same time, according to the relevant public information, the current railway network in China can only meet the domestic demand of around 40%, the railway transportation still exists obvious bottleneck, railway transportation is facing heavy pressure. China railway maintained a long-term overload operation, urgent needs and faster and better.
In transportation infrastructure construction, bridge construction in a large proportion. Such as high speed passenger railway bridge, the proportion is about 36%, and more long span bridges were needed to span the highway, railway, bay, river. With the continuous development and innovation of construction technology, an important role in the whole construction control of bridge construction in the process of being more and more people know. Now we can make every bridge construction as a system engineering, especially for large span prestressed concrete continuous girder bridge. In this system, with the structure of cantilever cast-in-place construction process by coupling the internal and external factors. How to effectively identify and reasonable values of the parameter of the system error, control each section of construction meet the design requirements, which requires us to conduct real-time monitoring of the construction process, effective rectification.
In this paper, the whole process of the cantilever construction control of the continuous beam of the No. 2 oversize bridge of the cross of puannan high speed is studied in the following aspects.
(1) summarized the development and current situation of construction control both at home and abroad, the content of construction control and the method of structural calculation, and summarized the characteristics and importance of cantilever construction monitoring for prestressed concrete continuous girder bridge.
(2) through the MIDAS/Civil simulation of the continuous beam cantilever construction process calculation. Considering the beam density, elastic modulus, thermal expansion coefficient, shrinkage and creep, the construction load, three prestressed transfer structure system, and the boundary conditions change, with the help of the rod model, get the main control section at different the construction stage under stress and elevation.
(3) in the monitoring process through the design value, is expected to comparative analysis between the three values and measured values, accurate correction of some parameters; using grey system theory to establish the GM (1,1) model by MATLAB self program to analyze and control the construction error, so as to effectively predict, adjust the next girder the vertical mold camber.
(4) continuous girder bridge zero block stress is complex, not easy to control in local cracks, affect the structure safety. The use of MIDAS/FEA three-dimensional model is established on the zero block, calculated the stress of zero block respectively in the maximum cantilever construction state and the state of the bridge, the structure the details were optimized.
Based on the related research and summary of cantilever construction monitoring for 2 continuous bridge of spanning South Expressway, this paper provides some theoretical basis and practical support for future similar concrete continuous girder bridge construction control, so as to ensure the safety and reliability of construction and completion of whole bridge.

【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

【共引文献】