Significant creep deformation occurs in steel subjected to high temperature and load action

and has important effect on the deformation and load bearing capacity of steel beams in fire.In order to quantify the influence of creep at elevated temperatures on load bearing capacity of restrained steel beams

finite element analysis model for restrained steel beam was established in ANSYS by taking creep into consideration.Comparison with test data shows that using the curves of stress-strain relation to consider creep can’t simulate the creep in restrained steel beam.The best agreement was found between analytical results using Poh model of stress-strain curves considering creep and test data.Parametric study was conducted by employing the validated model.The study indicated that the variation of rotational restraint stiffness

yield strength

heating rate and span-depth ratio et al have an obvious influence on critical temperature.Those parameters above are not considered in current fire resistance design standard on restrained steel beam.By doing regression analysis of the results of parametric study

a simplified calculating method is presented to calculate fire resistance of restrained steel beam considering creep effect.