Abstract
Firstly, a plastic model which considers time dependence effect at early ages is presented because it is thought to be significant to clarify a relation between plastic and creep component in order to formulate a rational interface model at layered concrete. Secondly, this model is applied to interface boundaries of layered concrete and a new interface model is developed. Thermal stress analyses using the interface model are carried out for real massive layerd concrete structures. As a conclusion, it can be confirmed that propagation of interface slip as well as stress, strain and displacement relations can be expressed analytically for the concrete structures which have different L/H and interface state.
