CREEP BUCKLING OF COLUMNS UNDER NONUNIFORM TEMPERATURE DISTRIBUTION

The creep buckling of columns with geometrical imperfections subjected to short time heat input is studied in this paper. A time hardening creep model is used to analyse creep with a nonuaiform temperature distribution along longitudinal direction of columns. Both geometric and physical noulinearities are taken into consideration in the governing equation. The internal forces and diaplacements are regarded as basic unknown variables which are discretized in space and time in terms of spline function collation point method and initial stress method, respectively. The computational results show that the buckling critical time are typically governed by the function of temperature distribution and boundary conditions in columns and the magnitude of the axial loads.