初始温度取值方法对混凝土箱梁温度场的影响  

Influence of initial temperature computing method on temperature distributions of concrete box girders

作　　者：薛俊青[1] 李哲熙 林健辉 布里斯杰拉·布鲁诺 黄福云[1] XUE Jun-qing;LI Zhe-xi;LIN Jian-hui;Briseghella Bruno;HUANG Fu-yun(College of Civil Engineering, Fuzhou University, Fuzhou 350108, China)

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《广西大学学报（自然科学版）》2021年第5期1188-1195,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51508103,51778148,51578161);陕西省交通运输厅科研项目(14-20K)。

摘　　要：为了研究初始温度取值的准确性对混凝土箱梁截面温度场的影响,总结了国内外文献中初始温度取值方法,以深圳市某座混凝土箱梁桥为背景工程,实测了箱梁横截面温度场,并建立有限元模型开展参数分析。分析结果表明,采用连续计算多天的方法减小初始温度取值误差是必要的。采用不同初始温度取值方法并连续计算4 d的有限元模型计算温度场与实测值误差均较小。综合考虑数据采集难度、适用范围和计算精度,建议采用零点环温循环法(采用目标日期零点环境温度并循环采用目标日期的环境温度、风速和太阳辐射数据作为边界条件)作为初始温度取值方法开展混凝土箱梁截面温度场研究。In order to analyze the influence of the accuracy of the initial temperature computing methods on the temperature distributions on concrete box girder cross-section,literature review on the initial temperature computing methods was carried out,and a concrete box girder bridge in Shenzhen was chosen as case study,of which the temperature distribution on the cross-section was monitored in the field,and the finite element model was established to conduct the parametric analyses.The analysis results show that it is methodologically necessary to use the same environmental conditions imposed cyclically for several days in order to reduce the influence of initial temperature condition.The differences between the measured temperature distributions on concrete box girder cross-section and the numerical data obtained from finite element models with cyclically imposed environmental conditions for four days and different initial temperature conditions were small.Considering the difficulty of data collection,application scope and calculation accuracy,the air temperature(0 a.m)imposed cyclically method(assuming the air temperature at 0 a.m.of the target date as the initial temperature,and the air temperature,wind speed and solar radiation of the target date imposed cyclically as the boundary conditions)is proposed as the initial temperature condition of the finite element model to carry out the research on the temperature distribution on box girder cross-section.

关 键 词：桥梁工程 初始温度 箱梁 环境温度 循环输入 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]