<b>Concrete Creep Strain Estimation Formula and Design Values of Concrete by Considering the Strength Development</b>

This paper presents an estimation of creep coefficients to investigate design values of creep coefficients for different types of cement. A formula for estimating compressive strength during loading, which is used to calculate the creep strain used in estimating the creep strain coefficient, was formulated based on the existing formula for estimating compressive strength. First, the design values of creep coefficients for effective prestress calculations are presented. The values were calculated assuming cement types and standard conditions for prestressed concrete (PC) bridges. Then the authors confirm the effect of the creep coefficients on the verification of simple PC girder.