To understand the response of restricted steel beam under elevated temperature and blast loading

the finite element program ANSYS was used to analyze the behavior of models with only elevated temperature

only blast loading and both elevated temperature and blast loading.The changes with elevating temperature of steel elastic modulus

yield strength and other physical properties was considered in the analysis

and the rate effect was also considered in the research.Firstly

the response of the restricted steel beam under standard fire（ISO834） was researched to investigate the properties with the fire only.And then

the response of the steel beam under different explosive strengths and explosive forms at the normal temperature to investigate the properties with the blast only.Lastly

the response of the steel beam under three different kinds of blast in different temperatures was analyzed

and the result was compared with the two former cases to discuss the influence of the fire and blast.