【作者】 张超；

【导师】 姚占勇；

【作者基本信息】 山东大学 ， 道路与铁道工程， 2011， 硕士

【摘要】 随着公路建设的发展,为满足地形条件的要求,刚构-连续组合梁桥的应用日趋广泛。刚构-连续组合梁桥一般墩身较高、跨径较大,结构复杂,而且施工过程中受多种因素的影响,使结构受力和变形更加复杂。线形控制是桥梁顺利合拢,成桥线形符合设计要求,以及结构的安全的必要保证。本文依托窟野河特大桥施工,建立结构模型,进行施工过程模拟计算,根据仿真计算的结果和实际施工过程,确定大桥施工控制方案,对实际工程桥梁施工过程中的线形进行监测；并对支座墩、过渡墩支座的偏移量的设置进行了计算。到目前的施工过程,监控效果良好。刚构—连续组合梁桥施工线形的影响因素众多,本文采用多扰动率方法,对刚构—连续组合梁桥设计参数敏感性进行了定量的分析；引入了桥梁设计参数敏感度的概念,给出了梁段不同位置对于刚构—连续组合梁桥设计参数的敏感度。通过对多个设计参数的敏感性进行定量分析,得知在最大悬臂状态下,容重的敏感性最大,弹性模量的敏感性次之,环境的相对湿度、管道偏差系数,管道摩阻系数稍小；梁段不同位置,对于参数的敏感度也不同。温度参数对悬臂结构挠度有较大的影响,施工中应采取一定的措施加以回避或修正。合拢顺序对线形影响较大,一经确定的施工顺序,尽量不要做出改变,一旦发生修改,监控的有关计算数据必须重新计算。在成桥状态下,预应力损失、混凝土收缩徐变等参数对主梁挠度影响较大。大跨度连续刚构桥施工过程复杂,影响参数多,对其施工过程实施有效的施工控制是桥梁施工质量和桥梁施工安全的重要保证。更多还原

【Abstract】 With the development of road building, rigid frame - continuous girder bridges become much more popular to meet the requirements of difficult terrain conditions. The regularity of stress and deformation changes of the structure is hard to achieve, because the Rigid Frame-continuous girder bridges are usually built with high piers, long girder by complicated method. And it is affected by a lot of parameters. Deformation control is a necessary program to make sure the bridge can be constructed correctly and safely.Based on the actual project this paper did a lot of researches on deformation control. This article introduced the development of Rigid Frame-Continuous Girder Bridge and current researches on deformation control, and presented the bridge control theory and method of structural analysis.According to finite element theory, this paper built the finite element model of the actual project using the finite element analysis software Midas/Civil and did a lot of calculation.Quantitative analysis results of many construction parameters under the largest cantilever state showed that Concrete density is the most sensitive parameter. The sensitivity of the elastic modulus ranked second. The relative humidity of the environment and two parameters of pre-stress loss are insensitive. Changes of temperature affect the deformation a lot. Certain measures should be taken to avoid the affection of temperature changes during construction. Construction order is important for the deformation of structure. It is avoided to change the order during construction. Data of deformation control must be recalculated if the order changed. Sensitivity analysis of many parameters are researched when the bridge is completed, it is known that loss of pre-stress force, concrete shrinkage and creep influence deflection of girder structure dramatically. These parameters must be controlled strictly. The construction process is very complex for long-span rigid frame- continuous bridge, and bridge status will be influenced by many parameters, So effective construction control is the assurance of quality and safety for the bridge. Determine control Strategy of the actual bridge was made According to simulation results and the actual construction process.This paper calculated the displacement of bearings, and made necessary adjustment.更多还原