混凝土桥塔日照温度效应分析  

Analysis of sunshine temperature effect of concrete bridge tower

作　　者：陈定市 胡大琳[1] 胡伟[1,2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]中交第一公路勘察设计研究院,陕西西安710061

出　　处：《兰州理工大学学报》2016年第3期143-149,共7页Journal of Lanzhou University of Technology

基　　金：交通运输部应用基础研究项目(2013319812100)

摘　　要：在温度与应力、变形不耦合,混凝土热物理性能不随温度变化的假定条件下,利用天文参数和气象资料推导出混凝土桥塔热交换边界条件;以大型有限元通用软件ANSYS为平台编制相应的热力耦合分析程序,计算出混凝土桥塔在日照温度效应下的温度场和应力场,分析其分布规律;并将计算值与实测值比较.计算结果表明,温度的实测值和计算值差异较小,采用的计算方法能够满足工程实际的需要;太阳辐射强度是影响截面温度分布的最主要因素,桥塔截面上某点的温度分布日时程曲线大致呈S形;截面形状对温度场的分布影响较大,截面突变、畸角部位温度拉应力相对其它部位较大.Under the assumption that temperature does not couple with stress and deformation and thermo-physical properties of concrete do not vary with temperature,heat exchange boundary conditions of the concrete bridge tower were deduced by using astronomical parameters and meteorological data,and the corresponding thermo mechanical coupling analysis code was programmed on the platform of the large-scale general finite element software ANSYS.And then the temperature and stress fields in the tower under the effect of sunshine were calculated,their distribution patterns were analyzed and they were compared with measured values.The result shows that the calculated values and the measured values will almost be identical and the calculation method used can meet the need of practical engineering.The intensity of solar radiation will be the major factor affecting the temperature distribution in the cross-section,and the daily time-history temperature distribution at a point on the tower section will exhibit approximately a S-shape.The shape of the cross-section of the tower will have a larger influence on the temperature field distribution,and abrupt change in tower section and abnormal angle area in tower section will likely lead to a larger temperature stress.

关 键 词：混凝土桥塔 日照效应 温度场 应力场 温度分布规律 

分 类 号：TU311[建筑科学—结构工程] U441.5[建筑科学—桥梁与隧道工程]