USE OF HOOKED STEEL FIBERS INSTEAD OF STIRRUPS IN BEAM-COLUMN CONNECTIONS

Süleyman Kamil AKIN, Nail KARA

Abstract


In an earthquake the energy should be dissipated by structural elements. The energy
concentrated in beam-column connections. As a result of this, the concrete in the connection zone should
not break, collapse and should stay stiff for no reduction in the load bearing capacity of connection.
Because of this all codes forces design engineer and constructor to continue stirrups in beam or column
without break in the connection. While application of reinforcement according to the design in
construction stage , to put stirrups in connection is very hard and takes a lot of time also it is very hard
to concrete this region also.
This study concerns with the use of hooked steel fibers instead of stirrups in beam column
connections. Recent studies made clear that, use of steel fibers increase ductility, stiffness and toughness
in concrete. In this study 5 beam-column connections are tested under cyclic loading. First specimen has
stirrups in connection zone according to code, the rest have no stirrups but have hooked steel fibers
instead in connection zone with varying volumetric ratio 0,000%, 0,250%, 0,375%, 0,500%.
The specimens are tested in Selcuk University Civil Engineering Department Structural
Laboratory. Earthquake loads are simulated on the 1/1-scaled specimens and all vertical and horizontal
displacements are taken by a dozen of LVDT and this data is sent and saved by the help of an electronic
device and computer program. The experimental load – deflection capacities are found and compared.


Keywords


Beam column connection; hooked; steel fibers; cyclic loading

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