AU(A plus U-shaped) composite beam was developed for reducing the story height in the residential buildings, and saving the cosrtuction cost of floor structures. Structural performance and economic feasibility of the composite beam have been sufficiently approved through the structural experiments and the analytical studies. Fire safety for the practical application of the composite beam has also been verified through the fire resistance tests and the heat transfer analyses. In this study 2-points bending tests were performed on the four specimens already tested for fire resistance to evaluate the residual bending strength of AU composite beam after fire accident. The same bending test was performed on the one fresh specimen having the same section and span of the specimens for practically comparative study.

In this study, the 3 point-bending test was performed on the RC T-beam and the image processing method was used to analyze the change of curvature according to the step of loading. As the loading step progressed, the bending deformation and inflection point of curvature by shear cracks occurred. It will be possible to evaluate the detailed behavior of the RC structure by using the image processing method used in this study.

In this study, five high intelligent concrete (HIC) test specimens were fabricated by reinforcing the cement mortar with garnet, fiber (nylon and polypropylene), and shape memory alloy (SMA), to examine the effects of the numbers and positions of the reinforcements on the physical characteristic of the SMA. In improving the yield strength and structural self-rehabilitation capability, two or more hybrid fiber, PP and SMA reinforcements, as in SMA-PP, SMA-NP, SMA-2 yielded better results than SMA-1.