摘要
为分析混凝土箱梁日照温度场的时空分布规律,结合气象数据建立了双对流边界的一维混凝土结构的温度场预估模型.采用积分变换法求得了预估模型的级数解,其前8项求和结果与数值结果及实测数据的最大误差分别为4%和11%.利用级数叠加式对混凝土温度场进行分解,得到了不同热流边界的温度场表达式.结合实测数据对热流边界进行分析,结果表明:取级数展开项n=5得到的混凝土结构的温度场,其计算结果与数值解的最大误差为5.9%;太阳辐射是混凝土温度场的主要影响因素,箱梁内气温可简化为恒温,其值可采用实测气温的平均值表示;可取综合换热系数值15.23 W/(m^(2)·K)近似计算混凝土箱梁的最不利温差.
To analyze the historical and spatial distribution of the thermal field of concrete box girder,a thermal field prediction model of one-dimensional concrete structure with a dual-convection boundary was established based on meteorological data.The series solution of the prediction model was obtained by the integral transformation method.The maximum errors between the summing results of the first eighth terms and numerical results and measured data were 4% and 11%,respectively.The concrete thermal field was decomposed by the superposition of series,and the thermal field expressions of different heat flow boundaries were obtained.The boundaries was analyzed with the measured data,and results show that when series expansion term n=5 is used to calculate the thermal field of concrete structures,the maximum error between calculation results and numerical solutions is 5.9%;solar radiation is the main influencing factor of the concrete thermal field,and the air temperature in the box can be simplified as a constant,whose value can be expressed by the average value of the measured air temperature.The comprehensive heat transfer coefficient value of 15.23 W/(m^(2)·K) can be used to approximate the most unfavorable temperature difference of concrete box girder.
作者
戴公连
张强强
葛浩
饶惠明
DAI Gonglian;ZHANG Qiangqiang;GE Hao;RAO Huiming(School of Civil Engineering,Central South University,Changsha 410075,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430072,China;Southeast Coastal Railway Fujian Co.Ltd.,Fuzhou 350013,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第11期77-82,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51708560)
中国铁路总公司科技研究开发计划资助项目(2017G006-N)
中央高校基本科研业务费专项资金资助项目(2020zzts151)。
关键词
混凝土箱梁
温度梯度
积分变换法
级数解
综合换热系数
concrete box girder
temperature gradient
integral transformation method
series solution
comprehensive heat transfer coefficient
