ABSTRACT
Creep and shrinkage effects of concrete plays an important role in the design of composite bridge. In the past, many analysis on the creep and shrinkage effects of concrete and other materials has been carried out based on experiments, and a general theoretical calculation method has been formed, which makes the calculation of creep and shrinkage effects in the design of concrete bridges and steel-concrete composite bridges more accurate. However, it is only used in concrete bridges and ordinary steel-concrete composite bridges currently. For steel-concrete-UHPC composite bridges, no calculation and analysis has been carried out yet. The steel-concrete-UHPC composite bridge involves the creep and shrinkage effects of concrete and UHPC, and the influence of age and external load simultaneously needs to be considered. The performance of steel-concrete-UHPC composite bridges under the creep and shrinkage effects of concrete and UHPC is different from that of ordinary concrete bridges and steel-concrete composite bridges. In this paper, based on the previous theoretical calculation methods of creep and shrinkage effects of concrete and UHPC, the equivalent cooling method and metal creep theory are used to simulate the creep and shrinkage effects of concrete and UHPC for steel-concrete-UHPC composite bridges. Then, the stress and deformation of steel-concrete-UHPC composite bridges under the creep and shrinkage effects are analyzed and studied with calculation results, which provides a reference for subsequent calculation and analysis of the creep and shrinkage performance of composite bridges.
