Long-span Prestressed Concrete Continuous Rigid Frame Bridge Shrinkage, Creep Effects Research

With the effort of the shrink age, creep load, the internal forces and deformations of the structure caused by the facotrs should not be neglected. We must consider the influences during the design and construction.This paper will explain detailedly the concrete shrink age, creep mechanism, the effect factors, the calculation theories with methods, and establish the computer module of construction supervision. Based on the past research findings, oneanalytical method for shrinkage and creep effect of concrete was studies mainly in this paper. Age-adjusted effective modulus was used to substitute for concrete elastic modular to consider the shrinkage and creep influences of concrete. Combiningage-adjusted effective modulus method with finite-element method, finite-element step-by-step analysis method was studied. Different shrinkage and creep model can be used to simulate the shrinkage and creep developing process of long-span prestressed concrete bridges. The shrinkage and creep model ,that is defined by "Specifications for Design of Reinforced Concrete and Prestressed Concrete Highway Bridges and Culverts"(JTG D62-2004)which is promulgated recently by our country is used in the method and the model which is based on the European method.The results had been applied on the construction supervision of GONGYI Bridge and have the great value to the other similar bridge type.