大跨预应力混凝土连续箱梁桥日照温差效应  

Sun Light Thermal Difference Effect on Long-span PC Continuous Box Girder Bridge

作　　者：方志[1] 汪剑[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中国公路学报》2007年第1期62-67,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(59808005)

摘　　要：对某特大型预应力混凝土连续箱梁桥进行了连续4 d的温差效应观测,在实测数据的基础上论述了箱梁桥的温度场及其变化规律,继而提出了一种适合于中国中部地区的同时考虑箱梁竖向和横向温差的温度梯度模式,将该模式与实测资料进行了比较并分析了温差效应。结果表明:由该模式计算出的最大横向温差时刻与实测结果十分吻合,对箱梁桥日照温差效应的测试有参考价值。According to 4 d continuous observation on thermal difference effect on a long-span PC continuous box girder bridge, the temperature field and its variation laws of box girder bridge were discussed based on measured data. A vertical and transverse thermal gradient model of PC box girder, which could apply in central China, was presented. This model was compared with the measured data and the thermal effect was analyzed. Results show that the maximal transverse thermal time calculated with the model agrees well with field test result and the model is of some value for the measurement of sun light thermal difference effect on box girder bridge.

关 键 词：桥梁工程 预应力混凝土箱梁 试验研究 日照温差效应 温度分布 温度梯度模式 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]