以前的钢筋混凝土箱形梁桥日照温度场和温度应力的计算,一般多以一维热传导为基础进行的。本文则是将温度场的计算归结为求解无内热源平面不稳定温度场的微分方程问题,将温度应力计算归结为平面应变问题,采用平面有限元方法,以四边形八节点等参元为基本单元,推导出统一的有限元公式,同时编制了FORTRAN77语言电算程序,并对茅岭江大桥在铺碴前(夏天)及通车后的冬天和夏天三种情况进行了计算,其结果与该桥实测值吻合较好。 The calculation of sunshine temperature field and temperature stress of the former reinforced concrete box girder bridges is generally based on one-dimensional heat conduction. In this paper, the calculation of the temperature field is attributed to the problem of solving the differential equation of the unstable temperature field without internal heat source. The calculation of the temperature stress is attributed to the problem of plane strain. By using the planar finite element method and the isoparametric element of quadrilateral eight nodes as the basic unit , A unified finite element formula was deduced. At the same time, FORTRAN77 language computer program was compiled, and the winter and summer post-ballasting (summer) and opening of Maolin River Bridge were calculated in winter and summer. The results were in agreement with the bridge The measured value is in good agreement.