高温浇注环境下钢桥面温度场及温度变形效应分析

Temperature field and thermal deformation of steel bridge deck during gussasphalt pavement paving

采用数值模拟的方法研究浇注式沥青混凝土摊铺时钢桥面摊铺温度场及温度变形效应.建立钢箱梁温度场模型,对浇注式沥青混凝土摊铺过程中钢桥面温度场分布规律进行了数值模拟,拟合出最不利温度荷载公式.根据时空等效原理建立考虑施工过程的温度荷载公式,计算钢桥面板的局部温度变形,并分析其对铺装效果的影响.研究结果表明,摊铺10 min后钢板局部迅速升温至120℃,并在17 min后达到最大温度123℃,此阶段摊铺温度对钢板结构的影响较大;摊铺区域钢板会产生局部温度变形,最大竖向变形达到7.5 mm,使摊铺层局部厚度有偏差,模拟值接近1 mm.

The temperature field and thermal deformation of steel bridge deck during gussasphalt pavement paving are studied by the numerical simulation technology.A temperature field model of steel box girder is established to analyze the temperature distribution law of steel bridge deck during gussasphalt pavement paving,and the worst temperature load equation is fitted subsequently.The temperature load equation considering the construction process is established based on the time-space equivalence principle.The local thermal deformation of the steel bridge deck is calculated,and the effect of thermal deformation on the pavement is discussed.Research results show that the paving temperature has a great effect on the steel bridge deck.After 10 min of paving,the local temperature of steel bridge deck reaches 120℃,and reaches a maximum of 123℃ after 17 min.Local temperature deformation appears in the steel bridge deck plate,and the maximum vertical displacement is 7.5 mm. This can lead to the thickness discrepancy of pavement,with a simulation value close to 1 mm.