Abstract:

Based on the nonlinear finite element method and the total strain theory , the basic equations of the temperature responses at room and high temperatures are deduced , in which the effects of different parameters , such as the connection rigidity , the geometric nonlinearity , the material plasticity and the linear distribution of temperature along the section height , are all considered. A computer program is then developed and applied to the analysis of the nonlinear temperature responses of one-stoηand two-stoηsteel frame structures. The calculated results accord well with the correlative experimental ones , thus verifying the correctness of the proposed theory and the program. Moreover , a comparison of the calculated results with other calculated and experimental results is performed. It is found that the connection rigidity has great effect on the middle span deflection of the beam and the horizontal displacement on the top of the column , but has liule effect on the axial deformation of the column.

Key words: steel frame structure, nonlinear analysis, temperature response