混凝土箱梁悬臂施工中温度梯度对标高影响的分析与控制  

Analysis and Control of Temperature-gradient's Influence on Formwork Erection Elevation during Balanced Cantilever Cast-in-place Segmental Construction of Concrete Girder

作　　者：王毅[1] 叶见曙[2] 

机构地区：[1]南京市公路建设处,江苏南京210012 [2]东南大学交通学院,江苏南京210096

出　　处：《公路交通科技》2009年第8期89-93,98,共6页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技资助项目(200331822315)

摘　　要：为研究混凝土箱梁悬臂施工阶段温度变形对成桥状态线形的影响,以苏北地区京杭大运河特大桥混凝土连续箱梁作为工程背景,进行了混凝土箱梁温度场的观测试验。在实测箱梁温度场数据的基础上,将传热学有限元分析结果与实测数据进行了比较,计算值和实测值吻合较好。从而验证了影响施工期间箱梁温度梯度的主要因素是太阳辐射强度和箱梁梗腋高度,定量确定了其与温度梯度之间的关系。研究表明,悬臂浇注施工箱梁温度梯度可以表达为太阳辐射强度和箱梁梗腋高度的函数,将计算温度梯度结果代入最大悬臂状态的计算模型中,可预测温度梯度对各节段箱梁立模标高的影响。In order to research the influence of temperature deformation in concrete box girder during balanced cantilever cast-in-place segmental construction, the temperature field of continuous concrete box girder of Beijing- hangzhou Grand Canal Bridge was observed.The result from heat transfer finite element analysis （FEA） and observed data shows good conformity. Intensity of solar radiation and height of haunch were found to be the main factors influencing the temperature gradient in box girder during cantilever construction, and function expression of the main factors with temperature gradient was gained. Research result shows that temperature gradient in box girder during cantilever construction can be expressed as function of intensity of solar radiation and height of concrete box -girder haunch, which means temperature gradient＇ s influence on box-girder formwork erection elevation can be predicted or computed after substituting calculated temperature gTadient value into that computational model.

关 键 词：桥梁工程 温度变形 有限元分析 混凝土箱梁 温度场观测 悬臂浇注 温度梯度 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]