由钢梁或预制混凝土梁(预应力混凝土或普通钢筋混凝土)和现浇桥面板组成的组合构件,对徐变和收缩极为敏感,因而,必须仔细研究徐变和收缩对组合构件应力分布和变形的影响。有关组合构件时效分析的文献已有许多。主要的有Satter、Branson and Ozell、Branson、Roll、Birkland、Trost et al、、Dilger and Neville等。后三篇文献使用的是由Trost提出的龄期系数法 Composites made of steel or precast concrete beams (prestressed concrete or plain concrete) and cast-in-situ bridge panels are extremely susceptible to creep and shrinkage and therefore the stress distribution and deformation of the composite components must be carefully studied Impact. There are many literatures on the aging analysis of composite structures. Mainly Satter, Branson and Ozell, Branson, Roll, Birkland, Trost et al ,, Dilger and Neville and so on. The last three articles used the age coefficient method proposed by Trost