Random Thermal Creep Stresses in Concrete Structures

Liu Ning  (Hohai University, Nanjing, 210024)
Liu Guangting£¨Tsinghua Uiversity, Beijing, 100084)

£Ábstract: Thermal creep stresses in mass concrete structures are influenced by many random factors including the random temperature in the concrete. In this paper, the random temperature in the concrete is considered as a nonstationary stochastic process. Based on the time discretization, a new method is suggested for simplifing the nonstationary thermal process. It is shown that by this method, the autocorrelation in both the time domain and the space of the temparature process can be easily and fully reflected by the simplified nonstationary temperature process with the formulation of time intevals. At the
mean time, in order to reflect the influences of random material parameters, the Stochastic Finite Element Method (SFEM) is introduced into the computation of random thermal creep stress. The initial strain stochastic finite element method is also suggested.
Keywords: concrete structure, random temperature, creep stress, stochastic finite element method.