Numerical Model For Concrete Considering Influence Of Temperature On Creep

In mass concrete structures, temperature stress and temperature control are very important to avoiding crack of concrete. Creep stress is a key part of temperature stress. In the course of computation of thermal-creep-stress, elastic modulus of concrete is related to the age of concrete; creep of concrete not only is related to the age of concrete, but also loading duration and the relation is complex.In this paper, mechanisms of influence of temperature on creep are presented. According to the theory of equivalent time, creep as a function of equivalent time is expressed. By fitting experimental data, parameters of creep in equivalent time field are obtained; initial strain implicit solution of elastic creep equation in equivalent time field is derived. A 2-D FEM program is designed to simulate and compute thermal-creep-stress field in a long beam on batholith and Taipu River Pumping Station. Some conclusion available in designing and construction are presented.