高墩大跨径连续刚构桥施工控制分析

发布时间：2018-05-22 11:56

本文选题：高墩 + 连续刚构桥　；参考：《武汉理工大学》2014年硕士论文

【摘要】：随着我国交通事业的飞速发展，高墩大跨径连续刚构桥的应用越来越广泛，特别是在西部山区需要此类桥型来跨越峡谷、河流等。高墩大跨连续刚构桥最常用的施工方法为悬臂浇筑法，，在施工过程中，结构将受到很多确定和不确定的因素影响，使结构的内力及线形不断发生变化，并且其在建成后的内力及线形等几乎无法调整，因此，在其施工过程中必须进行施工控制，以确保其线形和内力达到设计要求，结构最终顺利合拢。本论文主要的研究内容有：首先，简要介绍了高墩大跨连续刚构桥的概念、特点及其施工方法，论述了施工控制的意义、国内外发展现状等，较详细地阐述了施工控制的目的、内容、及其理论方法；简单地叙述了灰色系统理论的理论及建模机理。其次，以田湾河大桥(主桥跨度78+140+78m预应力混凝土连续刚构桥，最大墩高达87.5m)为例，展开施工控制的实际应用研究，依据实际桥梁结构，建立施工阶段仿真分析模型，对该桥施工过程进行施工控制分析计算。重点分析阐述了预应力混凝土连续刚构桥主梁线形和应力的监测控制理论、方法及技术措施，并对会影响到结构状态的主要设计参数进行了敏感性分析，用以更有针对性地修正计算模型，提高工作效率；并运用灰色系统理论建立GM(1,1)预测模型，对施工中箱梁挠度变形值进行计算和预测，取得了较好的效果。本论文通过对田湾河大桥的施工控制来反映施工控制理论在实际工程中应用，并对通过结构的实际测量值与其计算模型预测值进行对比并修正两者间的误差，使其达到施工控制的目的。田湾河大桥通过施工全过程的监控，其成桥状态能够满足设计预期。最后，以施工控制中主梁线形、应力的实测数据和理论计算值的对比分析为基础，对主梁变形及截面应力的变化历程进行了分析研究，得出一些有益的结论，可为今后同类桥梁的施工控制提供一定的参考。
[Abstract]:With the rapid development of transportation industry in our country , the application of high pier and large span continuous rigid frame bridge is more and more extensive , especially in the western mountain area , such kind of bridge is needed to cross the valley , river , etc . The most common construction method of high pier and large span continuous rigid frame bridge is cantilever casting method . During construction , construction control should be carried out to ensure its linear and internal force meet the design requirements .

Firstly , the concept , characteristics and construction methods of high pier and large span continuous rigid frame bridge are briefly introduced , the significance of construction control , the present situation of development at home and abroad are discussed , the aim , content and theoretical method of construction control are expounded in detail .
The theory and modeling mechanism of grey system theory are briefly described .

Secondly , based on the actual bridge structure , the practical application research of construction control is carried out . According to the actual bridge structure , the simulation analysis model of construction stage is built , and the construction control analysis calculation is carried out for the bridge construction process . The main design parameters which affect the structural state are analyzed and analyzed , and the calculation model can be corrected more pertinently to improve the working efficiency .
The grey system theory is used to establish GM ( 1,1 ) prediction model , and the deflection deformation value of box girder in construction is calculated and predicted , and the better effect is achieved .

In this paper , the construction control of Tianwan River Bridge is adopted to reflect the application of construction control theory in practical engineering , and the actual measured value of the structure is compared with its calculated model prediction value and the error between them is corrected , so as to achieve the aim of construction control .

Finally , based on the comparison and analysis of the measured data and the theoretical calculation value of the linear and stress of the main beam in the construction control , the change course of the deformation and the section stress of the main beam is analyzed , and some useful conclusions can be drawn , which can provide some reference for the construction control of similar bridges in the future .
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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