On the basis of the measures and experiments on a bridge, the effect of the air temperature change on concrete box girders, the temperature under sun radiation and its influence on concrete box girders are discussed.

• 在实桥观测与实验研究的基础上，论证了大气变温对混凝土箱梁的作用，探讨了混凝土箱梁在日辐射作用下所产生的温度场及其影响。