多室混凝土箱梁二维温度梯度研究

Study of two-dimensional temperature gradient of multi-room concrete box girder

文章基于对儒乐湖大桥的温度监测,采用假设检验和最小二乘法对多室混凝土箱梁实测温差进行了统计分析;根据监测数据提出多室箱梁的二维温度梯度曲线,并与现行铁路桥梁规范的温度梯度曲线进行比较。研究结果表明:南昌及其周边地区多室混凝土箱梁横向和竖向实测温差服从三参数对数正态分布;竖向和横向温度曲线可表示为2个指数函数相加,模拟温度场与实测值吻合良好,能较准确地描述多室箱梁的温度分布特性。

Based on the temperature monitoring of Rule Lake Bridge, the thermal differences in the multi-room concrete box girder section were investigated by using the hypothesis testing and least squares estimation. The two-dimensional temperature gradient curve was proposed according to the measured data and was compared with that in the current China＇s general ：code for the design of rail-way bridges. The results show that the transverse and vertical thermal difference of Nanchang City and its surrounding areas among test points can be presented by three-parameter lognormal distribu- tion. The transverse and vertical temperature curve can be presented by the sum of two exponential functions. The simulated temperature field agrees well with the measured values, which can accurate- ly describe the temperature field＇s characteristics of multi-room concrete box girder.