摘要
结合南京长江第二大桥北汊桥悬臂施工控制 ,在 3个箱梁节段混凝土中埋设了WZP 0 3 5铂热敏电阻作为温度测点并分别进行了 3个白天的箱梁混凝土现场观测 .观测结果表明 :太阳辐射作用下 ,混凝土箱梁沿截面高度的温度分布为非线性分布 .对实测的温度及相应温差按最小二乘法进行回归分析 ,提出了公路桥梁混凝土箱梁温差计算模式 :箱梁顶板上边缘最大温差值为2 0℃ ,向下至腹板按指数函数分布 ;而底板下边缘最大温差为 1 5℃ ,并且在 2 0 0mm高度内按直线变化 .沿桥轴线方向不同位置和不同高度的箱梁混凝土温度的观测和研究结果表明 。
In the process of cantilever construction control of the North Bridge of Nanjing Second Yangtze River Bridge, the WZP 035 thermally sensitive resistances as measuring points of temperature were buried into three segments of box girder, and the temperature field of box girder concrete was observed for three days. The observation shows that,under solar radiation, temperature distribution of concrete box along the height of box girder is non linear. The least square method is used for the regression analysis on the tested temperature and the temperature difference. A model for calculating temperature difference of concrete box girder of highway bridge is proposed such that the maximum temperature difference at highest point of box girder up slab is 20 ℃, reducing to zero by web with a distribution of exponential function, the maximum temperature difference at lowest points of down slab of box girder is 1 5 ℃ and it changes linearly within a height of 200 mm. The research and observation at different height and different section along longitudinal axis of box girder show that the temperature distribution pattern is the same.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2002年第5期788-793,共6页
Journal of Southeast University：Natural Science Edition
关键词
观测
桥梁工程
混凝土箱梁
太阳隔射
温度分布
bridge
concrete box girders
solar radiation
temperature distribution
