基于概率分析的混凝土箱梁温度梯度模式

发布时间：2018-05-14 11:55

本文选题：混凝土箱梁 + 温度梯度　；参考：《浙江大学学报(工学版)》2014年08期

【摘要】：为了建立混凝土箱梁的温度梯度模式,以位于浙江省千岛湖地区的一座大跨度连续刚构桥梁的温度场长期监测数据为基础,对箱梁的竖向最大正温差与环境气温之间的关系进行统计分析,建立依据日最高气温与日气温变化幅度估算混凝土箱梁竖向最大正温差的经验公式.根据极值统计理论提出箱梁的正温度梯度曲线,并与现行公路桥梁规范的温度梯度曲线进行比较.以实测气温、太阳辐射理论值为温度边界条件,根据二维热传导理论分析测试截面的理论温度场及分布特征.结果表明,现行规范的温度梯度曲线不能涵盖实测桥位地区50年一遇的气温条件,规范采用的温度梯度偏于不安全.按二维传热理论计算得到的理论温度场与实测值符合良好,理论分析能够模拟混凝土箱梁内部的温度分布特征.
[Abstract]:In order to establish the temperature gradient model of concrete box girder, the temperature field of a long-span continuous rigid frame bridge located in Qiandao Lake area of Zhejiang Province is based on the long-term monitoring data. Based on the statistical analysis of the relationship between the maximum vertical positive temperature difference and the ambient temperature of the box girder, an empirical formula for estimating the maximum vertical positive temperature difference of the concrete box girder is established according to the range of the daily maximum temperature and the daily temperature change. According to the statistical theory of extreme value, the positive temperature gradient curve of box girder is proposed and compared with the temperature gradient curve of current highway bridge code. Taking the measured temperature and the theoretical value of solar radiation as the temperature boundary conditions, the theoretical temperature field and distribution characteristics of the measured cross section are analyzed according to the two-dimensional heat conduction theory. The results show that the temperature gradient curve of the current code can not cover the temperature conditions once in 50 years in the measured bridge area, and the temperature gradient adopted in the code is not safe. The theoretical temperature field calculated by two-dimensional heat transfer theory is in good agreement with the measured value. The theoretical analysis can simulate the temperature distribution characteristics of concrete box girder.
【作者单位】：浙江大学土木工程学系;淳安县气象局;
【基金】：国家自然科学基金青年基金资助项目(51108412)
【分类号】：U448.23;U441.5

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