This paper describes one possible thermal analysis method to anticipate and control the inoculation effect during the solidification of CGI melt. Results show that 0.10-0.45 % ferrosilicon inoculation in the sample cup can promote the solidification morphology of the melt to evolve from hypoeutectic to eutectic or even low hypereutectic. With the stepwise more inoculant additions, the minimum eutectic temperature difference for the two stepwise additions decreases. The inoculation saturation value is basically reached in the 0.30 % inoculant sample cup, of which the minimum eutectic temperature increase is 5.3 • C compared with that of the original melt. When inoculated, the carbon potential and eutectic inoculation potential of the melt are improved. At 0.45 % inoculant, the melt can solidify in the form of low hypereutectic. In this case, the nodularity rate increases significantly to 34 %, and large particles of graphite nodule appear.

Abstract-Heating-up and rapid cooling by spray water had a large impact on the mechanics and deformation behavior for an axially restrained steel column. During heating, the axial force of the restrained steel columns increased in linearly. During rapid cooling, its axial force rapidly decreased until zero, and then it increased until the peak, and the max axial force was about 16% larger than that produced at heating, and its max bending moment was about 20% lager than that produced at heating. Axially restrained stiffness had a negative affection for its bearing capacity. When the axial stiffness ratio was less than 0.05, the buckling and failure temperature was relatively close, but when it was more than 0.05, there was a significant difference between them. Rotationally restrained stiffness played a beneficial role in its stable bearing capacity in fire. When its rotational stiffness ratio was less than 0.4, the rotational restrained stiffness had a large beneficial effect on its stability, but when the rotational stiffness ratio was more than 0.4, this beneficial effect was relatively small.

Abstract-During rapid cooling by spray water in fire fighting, the deformation of high temperature structural steel was different, it was mainly influenced by water and the steel structure itself temperature. Its bearing capacity was controlled by lower beam flange, and the joint bearing capacity was controlled by T-type plate. The beam temperature had a large effect on its failure mode. The yield and ultimate loads, they reduced about 6.1% and 9.6% between cooled from 400C and 600C, and its ultimate displacement reduced around 9.3%, its rotational angle increased about 15%. But their yield and ultimate loads reduced about 26.0% and 24.1% between cooled from 400C and 650C, and its ultimate displacement reduced about 18.4%.