In This paper

experiments on compression and tension of structuralsteel were carried out by transient tests.The experiments include five tension tests and two compression tests.According to the deformation rule of the tested steel

the mechanism of yielding was analyzed.Based on the definition of yield for steel material

the strength parameters of the steel in tension tests were obtained via transient tests.The results were then compared with those in compression tests.It was found that the high temperature strengths of tension and compression components were different.Thus

different safety factors must be selected for these two components during fire resistance designing.