The effect of steel fiber on the deflection of self- compacted slabs under
fire (6000
c) was investigated in this study. Three specimens were tested experimentally and
numerically ( by using sophisticated finite element programme ANSYS 7.0) to determine the
deflection of these specimens under two point load after burned under (6000
c) in a tested
furnace for four hours. Numerical study by using ANSYS programme is performed to
calculate the critical temperature and the temperature through the slabs with steel fiber
content of (0%,0.2%, and 0.5%). Another six model slabs with steel fiber content of (0.5%)
were studied numerically by using ANSYS 7.0 to investigate the effect of arrange of
parameters on the fire performance of self- compacted steel fiber reinforced concrete slabs.
The main factors that influence the fire resistance of self- compacted steel fiber reinforced
concrete slabs are: slab thickness, concrete cover thickness , moisture content.
The experimental results showed that the deflection of burned slab with steel fiber of (0.2%)
decreased to 30% than the deflection of burned slab without steel fiber under the same failure
load. While the deflection of burned slab with steel fiber of (0.5%) decreased to 50% than the
deflection of burned slab without steel fiber under the same failure load. On the other hand ,
the deflection results were checked with finite elements method by using sophisticated finite
element programme (ANSYS 7.0) and it was found that the results were acceptable and the
difference was not more than 9%. The results from thermal analysis showed that the
temperature decrease with the increase in the concrete depth of the self compacted steel fiber
reinforced concrete slabs, while the critical temperature for the slabs with steel fiber of
(0%,0.2%,0.5%) were (2500
c, 3500
c, 5800
c) respectively.
Parametric study results showed that the slab thickness dose not have significant effect on
the fire resistance of the self compacted steel fiber reinforced concrete slabs, while concrete
cover thickness has a significant effect on the fire resistance of the self compacted steel fiber
reinforced concrete slabs. Fire resistance increases with an increase in the moisture content of
the concrete in the slabs.
زينة وليد عباس | zinah waleed Abass | 11293