抄録
Bending tests were performed on concrete beams reinforced with large-sized deformed bars, designated as D 64, having nominal diameter of 64 mm and screw-type rolled deformation. Welded deformed bar mats were arranged within the concrete cover of the beams in order to control crack widths. It was showed that the additional arrangement of welded deformed bar mat near the concrete surface was effective for crack control of the beams. At the tensile stress of 2000 kgf/cm2 of D 64, the number of crack in the side surfaces of the beams increased by 1.4-2.7 times and the maximum bottom-surface crack width of beams decreased by 0.41-0.66 times those of the beams without the bar mat. These maximum surface crack widths can be estimated approximately by derived equations based on Model Code for Concrete Structures of CEB-FIP (1978).
