【作者】 蔡杰；

【导师】 李学文；

【作者基本信息】 长沙理工大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 超大跨度混合梁斜拉桥施工控制的主要目的是保证施工过程的安全并使成桥线型和内力最大限度地满足设计要求。影响超大跨度混合梁斜拉桥施工控制精度的因素很多,有结构参数、施工工艺、施工监测、结构计算分析模型、温度以及收缩、徐变的影响。其中,在施工过程中,温度是影响控制精度的一个非常重要的因素。本文以荆岳长江公路大桥主跨816m混合梁斜拉桥作为工程背景,分析了混合梁斜拉桥结构内部的温度场。对钢箱梁、混凝土箱梁、斜拉索、主塔的结构平均温度随时间的变化规律以及它们内部各点温度随时间的变化规律作了测试说明,也分析了钢箱梁、混凝土梁、主塔、斜拉索对温度变化的敏感性,并且用指数函数拟合了分离式钢箱梁正温差的梯度模式。以实际测试得到的结构内部温度场数据为基础,通过数值计算的方法,计算得到结构单元的轴向应变和挠曲变形曲率,并且以轴向应变和曲率作为温度参数,输入计算程序中,用有限元的方法计算温度对混合梁斜拉桥结构内力和变形的影响。分析说明了温度对施工过程中对主梁标高、结构应力和斜拉索索力的影响规律以及对温度的敏感性,并运用理论计算的方法分析了温度对结构应力的影响和施工中各次结构体系转换时温度对结构内力和变形的影响。通过计算温度对混合梁斜拉桥各个状态变量的影响量,再根据大量的实测数据,对施工过程中主梁精匹配标高的温度影响提出了一套简便、实用、准确的定量修正方法;对斜拉索第二张张拉索力的温度影响提出了回避温度的措施和定性的温度修正方法,对将来混合梁斜拉桥施工中处理温度影响问题有一定的参考价值。更多还原

【Abstract】 The main aim of ultra-long span composite cable-stayed bridge construction control is guaranteeing the satefy of the congstrution process and making the linetype and the internal force as large as possible accord with the demand of the design ,when the bridge is finished. Many main factors influence the precision of ultra-long span cable-stayed bridge construction control, for example parameter of structure, technics of construction, monitor and measure during construction, the model of structure for calculating and analysis, temperature, shrinkage and creep of concrete. In all factors, temperature is a main factor influencing the precision of bridge construction control.Basing on the JingYue Yangtze River Highway Bridge (mainspan 816m) ultra-long span cable-stayed bridge, this dissertation analyzed the temperature fields of typical concrete cable-stayed bridge with the girder of internai structure type section, and elucidated the rules of steel box girder , concrete box girder and the tower average and inside temperature which are relative to the time, and the sensitivity of the steel box girder , concrete box girder, tower and cable to the temperature was analyzed.And piecewise function was used to fitting temperature changes of the top and bottom slab of separate steel box girder.According to the fields of the temperature which from the test are based on data and by the numerical method calculating strain along axis and curvature,i.e taking the strain along axis and curvature as temperature parameter, adopting finite element method to calculate the quantity which temperature influence the Internal force and deformationof whole structure. The dissertation elucidated the rules of which temperature influence the level and cable force during the construction, the sensitivity of the level and the cable force to the temperature, And the use of theoretical methods to analyze the impact of temperature on the structural stress and the construction of the structures with temperature on the conversion of deformation and internal force.Basing on the calculating the influence of the state variable of the cable-stayed bridge produced by the temperature, a simple, convenient, applied and exact method for temperature revision of the form setting levels of every girder was positioned according to the abundant measuring data.On the cable-stayed Cable Force second temperature of measures proposed to avoid temperature and qualitative methods of temperature correction. Construction of hybrid girder cable-stayed bridge in the future to deal with temperature to a certain reference value更多还原