It ' s the first time clearly and systematically to present the concepts of restraint influence coefficient of steel to strain increment , to curvature increment and to deflection increment due to creep which are different each other . theoretical formulae are established , and approximate formulae are also obtained while considering the characteristics of common - used concrete and ambient condition of real bridges in china . so , an approximate restraint influence coefficient method to analyze the effect due to creep and shrinkage in pc bridges is put forward , and the equations to estimate second - force due to creep considering influence of steel in system - transferred continuous pc bridges is also established 本文首次清晰而系统地提出了钢筋对徐变的不同效应(徐变应变、徐变曲率、徐变上拱)约束影响系数的概念，建立了相应的计算式；结合我国普遍采用的混凝土的徐变特性和桥梁的构造特点及工作中南大学博士学位论文摘要环境特征，给出了具有较高计算精度的实用计算式;在此基础上，建立了桥梁徐变效应近似分析的钢筋约束影响系数法，并推导出了考虑钢筋影响的超静定梁徐变次内力的近似计算式，可方便地应用于桥梁研究和设计中。
