ABSTRACT
DEFORMATION CHARACTERISTICS OF REINFORCED CONCRETE BEAMS CONTAINING STEEL FIBERS
BYUNG HWAN OH, HYUNG JOON LEE, SEONG-LO LEE Associate Professor and Graduate Research Assistant
Department of Civil Engineering Seoul National University
Shinlim-dong, Kwanak-ku, Seoul, Korea
ABSTRACT
The mechanical behavior of reinforced concrete beams with steel fibers is investigated in the present study. An experimental program was set up and several series of reinforced concrete beams have been tested, including two series of singly-reinforced concrete beams and one series of doublyreinforced concrete beams. The fiber contents of reinforced-concrete beams for each series were varied from 0% to 2% by volume. The load was applied in four-point flexural loading condition. The deflections and the steel and concrete strains were automatically measured at the various points. The crack width and crack spacings at each loading step were observed during the loading process. It was found from these measurements that the crack widths increase almost linearly with the increase of steel stress and that the crack widths at the same loading stages are greatly reduced as the contents of steel fibers increase. The present study also indicates that the ductility and the ultimate resistance are remarkably enhanced due to the addition of steel fibers.
