A PROPOSAL ON THE FORMULA TO EVALUATE THE FORCE DUE TO CREEP AND SHRINKAGE OF THE PRESTRESSED CONCRETE STRUCTURE

Abstract

In this paper, comparing with the results of numerical step-by-step method, we examined whether the formula shown in “Specification for Highway Bridges” could evaluate exactly the influence of internal restraints by steel and delayed elasticity factor of concrete in the calculation of prestress decrement and indeterminate force due to creep and shrinkage of concrete. We discussed a formula to evaluate collectively those influence on the prestressed concrete structure which is subjected to the change of restraint conditions. And we illustrated the validity of the formula by some numerical results on the prestressed concrete continuous beams.