STUDI EKSPERIMEN ATAS KEKUATAN PENGHUBUNG GESER TIPE LEKATAN DARI TULANGAN BAJA LUNAK BERBENTUK SPIRAL

Abstract

This study was an experimental study on spiral-shaped bond shear
connector that is used in steel-concrete composite beams. Spiral is made of mild
steel reinforcement that has the same dimension between its diameter and its feet
distance (single spiral). Specimens was designed according to Austaralian Standar
AS 2327, Part 1, 1980 consisting of I shape steel profile and two concrete slabs
attached to the flanges of the profile. Four types or groups of specimens were made
with the same strength of concrete (27.65 MPa) and steel. Two spirals with
diameter of 2 inch, 2.5 inch, 3 inch and 3.5 inch were applied in each specimen
respectively and each group of specimen was consisted of three identical
specimens. Then the specimens were tested by the pushout test method until
failure. The results of experimental study shows that this type bond shear connector
that was made of steel reinforcing bars had given strength to bear shear force. All
specimens experienced failure purely due to the slip (bond failure) between the
spiral and concrete. Moreover, in elastic conditions there was no real different
behavior among the specimen groups. Differences in behavior occured at postelastic
condition that was started from the compression force value of 120 kN (60
kN for each spiral). The value of the failure compressive force for specimen group I, II, III and IV were 160 kN, 170 kN, 175 kN and 180 kN, respectively revealing
that there was consistency condition between the length of bond and the value of
the failuer forces.