大跨度连续刚构桥箱梁温度效应研究
发布时间：2019-06-04 17:57
【摘要】：桥梁结构处在不断变化的自然环境条件下,将不可避免地受到周围环境的影响。周围环境的影响主要体现在：太阳日照辐射、周围气温变化等。由于混凝土为热的不良导体,桥梁结构在太阳辐射等作用下将产生非均匀温度场。这种时刻变化的瞬态温度场会在混凝土结构,特别是超静定结构体系中产生较大的温度自应力,从而对桥梁结构的耐久性产生潜在威胁。交替变化的温度场产生的温度自应力有时候甚至比结构其他外荷载作用更大,因此揭示混凝土结构温度的分布规律,具有十分重要的理论意义和现实意义。现场实测资料表明：不同地理环境条件和大气环境条件对桥梁结构的温差应力影响十分明显。不同气候条件、不同地区的混凝土温度分布具有不同的特点,特别是温差较大的区域其温差荷载对桥梁结构的应力状态及位移挠度的影响更为明显。我国河南林州太行山地区由于日照强烈,早晚温差大,这种特殊的气候条件对桥梁结构的温度场分布研究具有重要的意义。本文结合林州露水河特大桥,对桥梁结构箱梁在典型日照温差下的温度分布状态进行观测分析,并应用ANSYS建立箱梁截面模型模拟其温度分布,确定了符合林州太行山地区的温度梯度分布模式,具有重要的理论意义和工程实用价值。本文运用ANSYS软件建立了露水河大桥在悬臂施工阶段的三维实体模型,计算分析了温度荷载对施工过程箱梁的竖向位移和纵向应力的影响。最后,通过MIDAS/CIVIL建立露水河特大桥的三维梁单元全桥模型,计算分析了温度荷载对成桥运营阶段箱梁的竖向位移和纵向应力的影响,认为桥梁在运营阶段的温度效应不容忽视,在设计中应充分考虑温度荷载效应对桥梁结构的影响。
[Abstract]:Under the changing natural environment, the bridge structure will inevitably be affected by the surrounding environment. The influence of the surrounding environment is mainly reflected in the solar radiation, the change of surrounding temperature and so on. Because concrete is a bad conductor of heat, the bridge structure will produce non-uniform temperature field under the action of solar radiation and so on. This kind of transient temperature field will produce large temperature self-stress in concrete structure, especially in statically inconstant structure system, which will pose a potential threat to the durability of bridge structure. The temperature self-stress produced by alternating temperature field is sometimes even greater than other external loads of the structure, so it is of great theoretical and practical significance to reveal the temperature distribution law of concrete structure. The field measured data show that the temperature difference stress of bridge structure is obviously affected by different geographical environment conditions and atmospheric environment conditions. The temperature distribution of concrete in different regions has different characteristics, especially in the area with large temperature difference, the influence of temperature difference load on the stress state and displacement deflection of bridge structure is more obvious. Due to the strong sunshine and large temperature difference between morning and evening in Taihang Mountain area of Linzhou, Henan Province, this special climatic condition is of great significance to the study of temperature field distribution of bridge structure. In this paper, combined with Linzhou Lushuihe Bridge, the temperature distribution of box girder of bridge structure under typical sunshine temperature difference is observed and analyzed, and the cross section model of box girder is established by ANSYS to simulate the temperature distribution. The temperature gradient distribution model in accordance with the Taihang Mountain area of Linzhou is determined, which is of great theoretical significance and practical value in engineering. In this paper, the three-dimensional solid model of Lushui River Bridge during cantilever construction is established by using ANSYS software, and the influence of temperature load on the vertical displacement and longitudinal stress of box girder during construction is calculated and analyzed. Finally, the three-dimensional beam element model of Lushuihe Bridge is established by MIDAS/CIVIL, and the influence of temperature load on the vertical displacement and longitudinal stress of box girder in the operation stage of the bridge is calculated and analyzed. It is considered that the temperature effect of the bridge in the operation stage can not be ignored, and the influence of the temperature load effect on the bridge structure should be fully considered in the design.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.5;U448.23
本文编号：2492894
[Abstract]:Under the changing natural environment, the bridge structure will inevitably be affected by the surrounding environment. The influence of the surrounding environment is mainly reflected in the solar radiation, the change of surrounding temperature and so on. Because concrete is a bad conductor of heat, the bridge structure will produce non-uniform temperature field under the action of solar radiation and so on. This kind of transient temperature field will produce large temperature self-stress in concrete structure, especially in statically inconstant structure system, which will pose a potential threat to the durability of bridge structure. The temperature self-stress produced by alternating temperature field is sometimes even greater than other external loads of the structure, so it is of great theoretical and practical significance to reveal the temperature distribution law of concrete structure. The field measured data show that the temperature difference stress of bridge structure is obviously affected by different geographical environment conditions and atmospheric environment conditions. The temperature distribution of concrete in different regions has different characteristics, especially in the area with large temperature difference, the influence of temperature difference load on the stress state and displacement deflection of bridge structure is more obvious. Due to the strong sunshine and large temperature difference between morning and evening in Taihang Mountain area of Linzhou, Henan Province, this special climatic condition is of great significance to the study of temperature field distribution of bridge structure. In this paper, combined with Linzhou Lushuihe Bridge, the temperature distribution of box girder of bridge structure under typical sunshine temperature difference is observed and analyzed, and the cross section model of box girder is established by ANSYS to simulate the temperature distribution. The temperature gradient distribution model in accordance with the Taihang Mountain area of Linzhou is determined, which is of great theoretical significance and practical value in engineering. In this paper, the three-dimensional solid model of Lushui River Bridge during cantilever construction is established by using ANSYS software, and the influence of temperature load on the vertical displacement and longitudinal stress of box girder during construction is calculated and analyzed. Finally, the three-dimensional beam element model of Lushuihe Bridge is established by MIDAS/CIVIL, and the influence of temperature load on the vertical displacement and longitudinal stress of box girder in the operation stage of the bridge is calculated and analyzed. It is considered that the temperature effect of the bridge in the operation stage can not be ignored, and the influence of the temperature load effect on the bridge structure should be fully considered in the design.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.5;U448.23
【引证文献】
相关硕士学位论文 前1条
1 李琛;预应力连续刚构桥施工预拱度设置和温度应力分析[D];重庆交通大学;2017年
，本文编号：2492894
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