钢箱梁斜拉桥主梁顶推法施工阶段控制研究
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摘要
本文以青银高速公路济南黄河大桥为工程背景,对采用顶推法施工的钢箱梁进行施工过程仿真计算和施工控制研究。顶推施工不同于悬臂施工,其最大特点在于随着施工过程的进行,结构的坐标、边界支承条件以及相应的结构内力、变形等均在不断地发生变化。针对这一特点,本文采用有限元方法,实现顶推施工过程的有效仿真模拟,并对影响顶推施工中结构受力和变形的参数进行了敏感性分析。另外,在监控中采用无应力状态法控制钢箱梁的标高,保证钢箱梁在顶推过程中以及顶推完成后的线形和受力状态始终处于设计要求的范围内。
首先,本文总结了顶推施工方法的由来、发展、施工特点及其在钢箱梁斜拉桥中的应用情况以及存在问题。阐述了桥梁施工控制的内容、方法和影响因素,确立了在青银高速公路济南黄河大桥钢箱梁顶推施工控制中以主梁线形为重点控制内容,即以线形控制为主,应力控制为辅的控制原则。
其次,本文详细介绍了青银高速济公路南黄河大桥主桥钢箱梁从顶推施工直至全桥合龙的施工方法及整个过程,并利用有限元专业软件MIDAS/Civil对钢箱梁在顶推全过程中的受力及变形情况进行了仿真计算,分析了主梁的内力、应力、位移施工过程中的动态变化情况,为施工控制提供理论数据。
本文对顶推施工中可能影响梁段受力及变形的设计参数进行了敏感性分析,确定了结构自重等需要在施工过程中随时关注、及时修正的主要参数。
最后,在结构计算及参数分析的基础上,对青银高速公路济南黄河大桥钢箱梁顶推施工阶段实施了监控,以结构无应力状态与设计状态保持一致为原则,进行钢箱梁的线形控制与调整,并对顶推过程中钢箱梁的应力进行实时监测,确保了顶推施工的顺利进行与施工控制的成功实施。
通过理论计算、参数分析与施工监测相结合,成功的实现了钢箱梁顶推施工阶段的控制,对于采用顶推法施工的该类型桥梁的仿真计算以及施工控制具有一定的参考价值。
This dissertation is based on the background of construction of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway. The construction process simulation and construction control of steel box girder bridge with incremental launching method is studied. Differed from cantilever method, the most prominent characteristic of incremental launching method is that the coordinate, supporting condition as well as the corresponding internal force and deformation of the structure are constantly changing during the construction. In response to this feature, finite element technology is utilized in this paper. This feasible method effectively realized the simulation during the process of incremental launching method. Moreover, this thesis analyzed the sensitivity of several design parameters which might have influences on internal force and deformation of structure during the construction stage. In addition, unstressed state control method was successfully adopted to modulate the line shape of the steel box girder. This method ensured that the line shape and internal force condition of the steel box girder were always be restrained in the range of design requirements during the construction stage as well as after the completion of incremental launching construction.
First of all, this article summarized the origin, development, construction characteristics, and the application in steel box girder as well as the problem of this application of incremental launching method. The contents, methods and influencing factors of control of bridge construction were expounded. The line shape and stress control were established as the contents of the construction control during the incremental launching construction stage of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway, and give priority to line shape control, stress control is a supplement.
In order to successfully implement construction control, this paper detailed the whole process and method of construction of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway, from the construction of incremental launching of steel box girder to the lock of the whole bridge. A finite element software MIDAS/Civil was used to calculate the internal force and deformation of steel box girder during the whole process of incremental launching construction stage. The dynamic variation of internal force, stress and deformation of girder during the construction stage were analyzed. The calculation provided a theoretical data for construction control.
Several design parameters, which were likely to have impact on the internal force and deformation of girder during the construction stage were analyzed. Through the sensitivity analysis, the self-weight of the structure and some other factors were considered as main parameters, which should be concerned and amended during the construction process.
Finally, based on the structure analysis and sensitivity analysis of parameters, the construction control was applied into the process of incremental launching construction of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway. The principle of construction control is that the non-stress condition of structure should consistent with the design condition. By adjusting and controlling the line shape of the steel box girder as well as monitoring and testing the stress of the steel box girder, the successful implementation of construction control and the carrying out of the incremental launching construction were ensured.
With the combination of theoretical calculation, parameters analysis and construction monitoring, construction control of incremental launching method of steel box girder were successfully achieved, which have certain reference value for the structure analysis and construction monitoring of this type of bridge with incremental launching method.
首先,本文总结了顶推施工方法的由来、发展、施工特点及其在钢箱梁斜拉桥中的应用情况以及存在问题。阐述了桥梁施工控制的内容、方法和影响因素,确立了在青银高速公路济南黄河大桥钢箱梁顶推施工控制中以主梁线形为重点控制内容,即以线形控制为主,应力控制为辅的控制原则。
其次,本文详细介绍了青银高速济公路南黄河大桥主桥钢箱梁从顶推施工直至全桥合龙的施工方法及整个过程,并利用有限元专业软件MIDAS/Civil对钢箱梁在顶推全过程中的受力及变形情况进行了仿真计算,分析了主梁的内力、应力、位移施工过程中的动态变化情况,为施工控制提供理论数据。
本文对顶推施工中可能影响梁段受力及变形的设计参数进行了敏感性分析,确定了结构自重等需要在施工过程中随时关注、及时修正的主要参数。
最后,在结构计算及参数分析的基础上,对青银高速公路济南黄河大桥钢箱梁顶推施工阶段实施了监控,以结构无应力状态与设计状态保持一致为原则,进行钢箱梁的线形控制与调整,并对顶推过程中钢箱梁的应力进行实时监测,确保了顶推施工的顺利进行与施工控制的成功实施。
通过理论计算、参数分析与施工监测相结合,成功的实现了钢箱梁顶推施工阶段的控制,对于采用顶推法施工的该类型桥梁的仿真计算以及施工控制具有一定的参考价值。
This dissertation is based on the background of construction of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway. The construction process simulation and construction control of steel box girder bridge with incremental launching method is studied. Differed from cantilever method, the most prominent characteristic of incremental launching method is that the coordinate, supporting condition as well as the corresponding internal force and deformation of the structure are constantly changing during the construction. In response to this feature, finite element technology is utilized in this paper. This feasible method effectively realized the simulation during the process of incremental launching method. Moreover, this thesis analyzed the sensitivity of several design parameters which might have influences on internal force and deformation of structure during the construction stage. In addition, unstressed state control method was successfully adopted to modulate the line shape of the steel box girder. This method ensured that the line shape and internal force condition of the steel box girder were always be restrained in the range of design requirements during the construction stage as well as after the completion of incremental launching construction.
First of all, this article summarized the origin, development, construction characteristics, and the application in steel box girder as well as the problem of this application of incremental launching method. The contents, methods and influencing factors of control of bridge construction were expounded. The line shape and stress control were established as the contents of the construction control during the incremental launching construction stage of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway, and give priority to line shape control, stress control is a supplement.
In order to successfully implement construction control, this paper detailed the whole process and method of construction of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway, from the construction of incremental launching of steel box girder to the lock of the whole bridge. A finite element software MIDAS/Civil was used to calculate the internal force and deformation of steel box girder during the whole process of incremental launching construction stage. The dynamic variation of internal force, stress and deformation of girder during the construction stage were analyzed. The calculation provided a theoretical data for construction control.
Several design parameters, which were likely to have impact on the internal force and deformation of girder during the construction stage were analyzed. Through the sensitivity analysis, the self-weight of the structure and some other factors were considered as main parameters, which should be concerned and amended during the construction process.
Finally, based on the structure analysis and sensitivity analysis of parameters, the construction control was applied into the process of incremental launching construction of Ji'nan Yellow River Bridge on Qingdao-Yinchuan Expressway. The principle of construction control is that the non-stress condition of structure should consistent with the design condition. By adjusting and controlling the line shape of the steel box girder as well as monitoring and testing the stress of the steel box girder, the successful implementation of construction control and the carrying out of the incremental launching construction were ensured.
With the combination of theoretical calculation, parameters analysis and construction monitoring, construction control of incremental launching method of steel box girder were successfully achieved, which have certain reference value for the structure analysis and construction monitoring of this type of bridge with incremental launching method.
引文
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