预应力混凝土连续刚构桥温度观测与分析

基于东莞市一座大跨径桥涵预应力混凝土箱梁半年的连续温度场观测结果，分析了在太阳辐射下春、夏季的混凝土箱梁各个截面的温度场随时间变化的规律，利用数理统计方法，拟合了截面升温模式和降温模式的温度梯度，并分析了各国规范截面沿梁高的温度梯度模式，得出了适合广东地区的温度梯度模式．最后，借助大型有限元软件ANSYS对3#截面进行了温度场模拟分析，并将计算温度与实测温度进行了比较．分析结果显示，有限元模型可以精确地仿真实际混凝土温度场．

Observation and analysis of temperature in prestressed concrete continuous rigid-frame bridge

Based on a long-span prestressed concrete box-girder bridge which have spended half a year continuously observing temperature field in Dongguan city, the variational regularity with time is analyzed in details according to temperature field of the concrete box-girder in each section under solar radiation both in spring and summer. Mathematical statistical methods were used to fit the heating mode, the cooling mode of the temperature gradient is adopted in each cross-section, countries＇ standard is analyzed along the cross-section of the temperature gradient, the results indicate that the temperature gradient mode is suitable for Guangdong area. In the end,the temperature field of the No. 3 section is simulated by means of the Finite Element Analysis（FEA）software and the computational results are compared with the experimental results. The results show that the finite element model can effectively simulate the temperature field of the concrete in practice.