Abstract
This paper aims at investigating the behavior of cantilever beam in reinforced concrete frame modified by steel fibers. The study depends on adding steel fibers at the joint of beam column section to improves the ductility of the beam – column joint. Steel fibers of ratio (0.5%) and (1%) steel fibers by volume added for two specimens comparing with two others cast without steel fibers joint in R.C. frame. The cantilever frame behavior at applied load will be discussed in this study. The load applied to the frame at the edge of cantilever arms. The test results showed that the difference between the monolithic frame is larger in ultimate loads compared with nonmonolithic, and the frame with 1% steel fibers have large load capacity compared with 0.5% steel fibers frame. The frame which cast monolithically shows highest resistance among the three other frames in ultimate load and flexural deformation, after load was applied to the four specimens the behavior of the frame up to the failure occurred in the beam-column joint at exterior face of the cantilever. beside studying the effect of steel fibers percentage and behavior of beam column joint, this study focuses also on investigating the difference between monolithic and non-monolithic concrete elements
Highlights
The beam – column joint has limited amount of strength capacity because this capacity is determined by its strength
It is clearly obvious that the monolithic beam-column joint without steel fiber was more efficient than the non-monolithically cast frame
The ultimate load for frame monolithic increases more than the nonmonolithic frame by about 54%.the part of beam-column joint casted nonmonolithically caused a poor interaction section, splitting zone occur at the beam column joint area
Summary
The beam – column joint has limited amount of strength capacity because this capacity is determined by its strength. When the applied load is greater than the nominal strength capacity of the joint, the connection between the structural elements fails The flawed in this model must be avoided, and the repair of this type of failure is rather complicated. As to improve the ductility behavior of beam-column joint, shear reinforcement could be added in small percentage to the structural member. In order to overcome the difficulties of using extra percentage of stirrups in narrow sections, GENCOGLU and EREN in 2002, used steel fibers in intersection of the beam – column area and the specimens were subjected to reversed cyclic load. Another study reinforced concrete structure by using ultra-high steel fibers to strengthening the connection between beam - column was done by WANG and LEE in 2007. The behaviors were even better when reinforced concrete jacketing was used added [3]
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