The amount of deflection that affect deflection caused by the load of steel board used to support concrete blocks were analyzed. By eliminating the central area of the cross section of board, it was possible to design a new board that reduces the weight of the board by about 50% while increasing the deflection by only about 10% for 5000N load. Since the deflection of the board is inversely proportional to the moment of inertia for area, it is most important to increase the cross-sectional height of the board to reduce the deflection, followed by the thickness of the upper and lower plates, and the thickness of the internal forming material played the smallest role. The other parts, the side supporting parts and reinforcing parts, were found to play a negligible role in preventing deflection. Applying the results of this study, we can predict the amount of board deflection and find the effective cross-sectional design of board without exceeding the deflection limit.

• 이종선 (한동대학교) | Chongsun Lee Corresponding author