大跨径混合梁斜拉桥中跨合龙施工控制研究
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摘要
随着斜拉桥跨径的不断增大,施工控制在斜拉桥施工过程中的作用越来越重要。对于大跨径斜拉桥的施工控制来说,中跨合龙阶段最为重要。本文以荆岳长江公路大桥为工程背景,基于自适应无应力思想,提出了一种大跨径混合梁斜拉桥的中跨合龙施工控制新方法。并采用该方法对中跨合龙施工控制的全过程进行了全面分析和评述。具体研究的内容为:
(1)采用BDCMS系统,分析了荆岳长江公路大桥最大悬臂工况和中跨合龙塔梁临时约束解除后工况几何非线性对全桥线形和内力的影响,阐述了考虑几何非线性进行理论分析对于大跨径混合梁斜拉桥中跨合龙施工控制的重要性。
(2)对大跨径混合梁斜拉桥中跨合龙施工控制提出了一种新的方法—缝接合龙法。详细阐述了该方法的基本原理和优点,提出了该方法用于斜拉桥中跨合龙时需要解决的关键技术,并成功运用于荆岳长江公路大桥中跨合龙施工控制中,取得了较好的效果。
(3)以荆岳长江公路大桥为背景,阐述了合龙前悬臂施工时线形和内力的控制对中跨合龙的重要性;对最大悬臂工况时温度对塔索梁影响进行了理论计算;详细研究了最大悬臂状态主梁精确定位控制的方法和中跨最后悬拼节段下料长度的计算方法。
(4)阐述了合理顶推力对大跨径不对称斜拉桥结构体系下中跨合龙的重要性。精确计算分析了牵引行程和牵引力的关系;提出了不对称斜拉桥中跨合龙前合理单边牵引的施工工艺和控制手段。
(5)分析了荆岳长江公路大桥合龙温度和体系转换温度变化对成桥目标线形和内力的影响。
With increasing cable-stayed bridge, the construction control in construction process of the increasingly significant position. For long-span cable-stayed bridge construction control, mid-span closing most important. With the case study of Jingyue Yangtze River Highway Bridge, based on the self-adaptive stress-free thought,put forward a kind of new technology on mid-span closing of long-span cable-stayed bridges construction control.This thesis employed new closing technique, analyzed and commented in an exhaustive way on the construction control process of long-span cable-stayed bridges. The main contents of this thesis are as follows:
1. Through BDCMS system, this thesis elaborated the influence on the bridge linearity and internal force by geometry nonlinearity under the circumstance of Jingyue Yangtze River Highway Bridge with longest cantilever and temporary constraint-free tower beam after mid-span closing. It also expounded on the importance of geometry nonlinearity theory in calculation and analysis for the construction control of long-span cable-stayed bridges with composition beam.
2. A new method– seaming close was raised for mid-span closing construction control of long-span cable-stayed bridges, the fundamental principle and strengths of which were presented explicitly in the thesis. The vital technology of adopting this method in were also pointed out. It was successfully used in the construction control of the mid-span closing for Jingyue Yangtze River Highway Bridge and received satisfying result.
3. With the case study of Jingyue Yangtze River Highway Bridge, the thesis analyzed before closure the importance of the cantilever construction on the bridge’s linearity and internal force for mid-span closing;longest cantilever the influence of the temperature of change theoretical calculation and analysis;the thesis explicitly researched on the precise positioning control method for longest cantilever and the length calculation of the mid-span cantilevering in the last section.
4. The thesis explained the significance of the adequate traction force to the mid-span closing of unsymmetrical long-span cable-stayed bridges, analyzed accurately the interaction between tractive distance and force, and introduced the technique and controlling method of the adequate unilateral tractive force before mid-span closing of the unsymmetrical cable-stayed bridges.
5. Calculated of Jingyue Yangtze River Highway Bridge closing and system conversion the influence of temperature variation to finally into bridge.
(1)采用BDCMS系统,分析了荆岳长江公路大桥最大悬臂工况和中跨合龙塔梁临时约束解除后工况几何非线性对全桥线形和内力的影响,阐述了考虑几何非线性进行理论分析对于大跨径混合梁斜拉桥中跨合龙施工控制的重要性。
(2)对大跨径混合梁斜拉桥中跨合龙施工控制提出了一种新的方法—缝接合龙法。详细阐述了该方法的基本原理和优点,提出了该方法用于斜拉桥中跨合龙时需要解决的关键技术,并成功运用于荆岳长江公路大桥中跨合龙施工控制中,取得了较好的效果。
(3)以荆岳长江公路大桥为背景,阐述了合龙前悬臂施工时线形和内力的控制对中跨合龙的重要性;对最大悬臂工况时温度对塔索梁影响进行了理论计算;详细研究了最大悬臂状态主梁精确定位控制的方法和中跨最后悬拼节段下料长度的计算方法。
(4)阐述了合理顶推力对大跨径不对称斜拉桥结构体系下中跨合龙的重要性。精确计算分析了牵引行程和牵引力的关系;提出了不对称斜拉桥中跨合龙前合理单边牵引的施工工艺和控制手段。
(5)分析了荆岳长江公路大桥合龙温度和体系转换温度变化对成桥目标线形和内力的影响。
With increasing cable-stayed bridge, the construction control in construction process of the increasingly significant position. For long-span cable-stayed bridge construction control, mid-span closing most important. With the case study of Jingyue Yangtze River Highway Bridge, based on the self-adaptive stress-free thought,put forward a kind of new technology on mid-span closing of long-span cable-stayed bridges construction control.This thesis employed new closing technique, analyzed and commented in an exhaustive way on the construction control process of long-span cable-stayed bridges. The main contents of this thesis are as follows:
1. Through BDCMS system, this thesis elaborated the influence on the bridge linearity and internal force by geometry nonlinearity under the circumstance of Jingyue Yangtze River Highway Bridge with longest cantilever and temporary constraint-free tower beam after mid-span closing. It also expounded on the importance of geometry nonlinearity theory in calculation and analysis for the construction control of long-span cable-stayed bridges with composition beam.
2. A new method– seaming close was raised for mid-span closing construction control of long-span cable-stayed bridges, the fundamental principle and strengths of which were presented explicitly in the thesis. The vital technology of adopting this method in were also pointed out. It was successfully used in the construction control of the mid-span closing for Jingyue Yangtze River Highway Bridge and received satisfying result.
3. With the case study of Jingyue Yangtze River Highway Bridge, the thesis analyzed before closure the importance of the cantilever construction on the bridge’s linearity and internal force for mid-span closing;longest cantilever the influence of the temperature of change theoretical calculation and analysis;the thesis explicitly researched on the precise positioning control method for longest cantilever and the length calculation of the mid-span cantilevering in the last section.
4. The thesis explained the significance of the adequate traction force to the mid-span closing of unsymmetrical long-span cable-stayed bridges, analyzed accurately the interaction between tractive distance and force, and introduced the technique and controlling method of the adequate unilateral tractive force before mid-span closing of the unsymmetrical cable-stayed bridges.
5. Calculated of Jingyue Yangtze River Highway Bridge closing and system conversion the influence of temperature variation to finally into bridge.
引文
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[13]陈常松.超大跨度斜拉桥施工全过程几何非线性精细分析理论及应用研究[D].中南大学,2007,49-55
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[17]江峰.薄壁箱梁混合单元及其在斜拉桥双重非线性分析中的应用研究[D].中南大学,2004,53-57
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