摘要
连续刚构桥在国内得到了广泛的应用。对于修建在山区峡谷地区的连续刚构桥，由于受到地貌限制，主梁边中跨比不得不做的异于普通桥梁，桥跨常常设置成不对称的形式。跨径不对称会造成桥墩上T构两边梁段数量不一致，这样的连续刚构桥常常采用非对称施工，合龙顺序也会有所不同。
云南省普宣高速公路小湾大桥是一座典型的采用非对称施工的连续刚构桥，边跨比中跨多出两个梁段，本文立足于非对称施工的连续刚构桥小湾大桥，采用桥梁结构专用分析软件MIDAS/Civil对施工过程进行模拟，对比分析了两种非对称施工方法，进行了合龙优化研究，并拟合出顶推力的实用计算公式。本文的主要研究内容有：
⑴针对边跨多出梁段的非对称施工，对比分析了两种非对称施工方法，方法一为在中跨配重、非对称浇筑边跨多出梁段，方法二为先中跨合龙后再非对称浇筑边跨多出梁段。从主梁应力、主梁线形、桥墩内力和墩顶位移四个方面对两种方法进行了对比分析。
⑵针对先边跨后中跨和先中跨后边跨两种不同合龙顺序，从主梁应力、主梁线形、桥墩内力和墩顶位移四个方面进行了对比分析。
⑶针对温度变化对主梁应力和主梁线形的影响，以系统升温为例，分析了两种不同合龙顺序下系统温差效应的差异。
⑷针对混凝土收缩、徐变对桥梁施工过程和成桥状态的影响，分析了收缩、徐变对主梁应力和主梁线形的影响，并比较了两种不同合龙顺序的收缩、徐变效应。
⑸针对连续刚构桥在合龙时要进行顶推，阐述了计算顶推力的有限元方法。由MATLAB线性拟合出由合龙温差计算顶推力的实用计算公式。
国内外有不少采用非对称施工的连续刚构桥，但是相关的文献却很少。通过本文对非对称施工连续刚构桥的详细对比分析，得到的结果可以为同类桥梁的设计和施工提供很好的参考。
关键词：连续刚构桥，非对称施工，合龙优化，系统温差，收缩徐变，顶推力
Abstract
The continuous rigid frame bridge for the advantages of convenient construction, reasonable force, and economical cost has been widely ud in domestic bridge construction. As to continuous rigid frame bridge built in the mountain valley areas, due to the landform limits, main-side span ratio has to be different from common bridges, the bridge span is often t to asymmetric forms, which will cau the number of beam gments on both sides of T-Frame is unequal, such continuous rigid frame bridge is often different from continuous rigid frame bridge with the symmetrical span, the closure methods are therefore different.
北方月饼
Xiaowan Bridge which is a typical continuous rigid frame bridge with asymmetric construction located in Puxuan Highway in Yunnan Province, using MIDAS/Civil，this paper contrasts and analyzes its two asymmetric construction methods and its reasonable closure plan. The main contents and results are as follows:
⑴In order to finish the construction of the asymmetric beam gments on sidespan, two construction methods concerning four aspects including the deformation of main girder, the internal force of main girder ,the internal force of piers and horizontal displacement at pier top are contrasted and analyzed.
⑵Four aspects including the deformation of main girder, the internal force of main girder, the internal force of piers and horizontal displacement of pier top are compared between two different closure quences.
⑶Considering the effect of temperature difference, the temperature has a strong impact on stress and displacement of the girder. Set the ri of system temperature an example, the differences of the effect of the temperature difference between different closure quences are analyzed.
⑷The shrinkage and creep of concrete has an effect on the bridge construction process and the fina
l bridge state. The effect of the shrinkage and creep of concrete to the stress and deformation of main girder, and the difference of the action when the bridge has different closure quence are analyzed. The results of comparison and analysis show that the closure quence which closures side span first and mid span cond is more favorable and should be lected.
⑸Normally, before the continuous rigid frame bridge begins to closure, it is necessary to conduct incremental launching. The calculation method of closure jacking force using finite element model is expounded. By calculating the displacement of pier top caud by
temperature difference and concrete shrinkage and creep, displacement which need to be controlled during the incremental launching is obtained, jacking force is calculated as well. A linear relationship between jacking force and temperature difference is found. A practical calculation formula is fitted out using MATLAB, thus jacking force can be calculated.
语言造句There are many continuous rigid frame bridges with asymmetric construction at home and abroad, but the related literatures is ldom. Through this paper, which a detailed comparative analysis of the asymmetric construction continuous rigid frame bridge is conducted, the results obtained can provide a good reference for the design and construction of similar bridges.
Key words:continuous rigid frame bridge, asymmetric construction, optimization of closure, temperature difference of system, shrinkage and creep, yacking force
目录
第一章绪论 (1)
1.1连续刚构桥的特点 (1)
大手印
1.2连续刚构桥的发展概况及发展趋势 (2)
1.2.1连续刚构桥的发展概况 (2)
胡萝卜须
1.2.2连续刚构桥的发展趋势 (4)
1.3连续刚构桥的合龙研究现状 (5)
1.4本文研究的主要工作和意义 (7)
1.4.1非对称施工连续刚构桥实例 (7)
1.4.2本文研究的主要工作 (8)
1.4.3本文研究的意义 (9)
第二章连续刚构桥合龙的主要影响因素 (10)
2.1连续刚构桥合龙段施工的一般过程 (10)
2.2合龙中配重的确定 (11)
2.2.1配重的作用 (11)
电功2.2.2配重的设置方法 (12)
2.2.3配重大小的选择 (13)
2.3合龙温度的影响及选择 (14)
2.3.1环境温度对合龙段的影响 (14)正祖大王
2.3.2合龙温度的确定 (15)
2.4合龙预应力的影响 (16)
2.5合龙顺序的影响 (16)
彩石溪
第三章非对称施工静力仿真分析 (17)
3.1工程概况 (17)
3.2计算模型的建立 (18)
3.2.1结构分析计算参数 (18)
3.2.2边跨多出梁段非对称施工方法 (20)
3.2.3结构有限元模型及基本假定 (21)
3.3不同施工方法浇筑边跨多出梁段对主梁应力的影响 (22)
3.4不同施工方法浇筑边跨多出梁段对主梁线形的影响 (24)
3.5不同施工方法浇筑边跨多出梁段对桥墩内力和墩顶位移的影响 (27)
3.6本章小结 (28)
第四章合龙优化分析 (29)
4.1不同合龙顺序结构受力分析 (29)
4.1.1不同合龙顺序对主梁应力的影响 (29)
4.1.2不同合龙顺序对主梁线形的影响 (31)
4.1.3不同合龙顺序对桥墩内力和墩顶位移的影响 (33)
4.2不同合龙顺序结构系统温差效应分析 (33)
4.2.1不同合龙顺序系统温差对主梁应力的影响 (33)
4.2.2不同合龙顺序系统温差对主梁线形的影响 (35)
4.3不同合龙顺序收缩、徐变效应分析 (37)
4.3.1不同合龙顺序收缩、徐变对主梁应力的影响 (37)
4.3.2不同合龙顺序收缩、徐变对主梁线形的影响 (40)
4.4本章小结 (42)
第五章合龙顶推力的优化 (44)
5.1顶推的意义 (44)
5.2顶推力计算 (44)
5.3本章小结 (51)
结论与展望 (52)
结论 (52)
展望 (53)
攻读学位期间取得的研究成果 (58)
德育过程致谢 (59)
