Civil Engineering Reference
In-Depth Information
to study the behavior of headed studs in composite beams with ribbed metal
decks perpendicular and parallel to the steel beam, but five of the push-off
specimens had solid concrete slabs. These five push-off specimens were sim-
16 mm and a height of 76 mm. They found that when the studs were spaced
sufficiently far apart, the mode of failure is likely to be because of the shearing
off of studs. On the other hand, concrete failure was observed in specimens
when the studs were closely spaced (longitudinal spacing less than 6
the
stud diameter), and this led to a reduction in the stud strength by 7%. Oehlers
beams across the steel flange/concrete slab interface by the action of individ-
ual connectors. The authors have shown that shear connectors in steel-
concrete composite beams act as steel dowels embedded in a concrete
medium. These shear connectors are generally assumed to fail when the steel
component fractures, which may be a consequence of the gradual reduction
in strength and stiffness of the concrete in the bearing zone of high triaxial
showed that the concentrated load
P
that a connector applies to a slab
can induce three distinct modes of cracking of the slab shown in
Figure 2.20
.
The modes of cracking comprise lateral, shear, and splitting cracks. The lat-
eral cracks are the cracks extending from the sides of the connector and
caused by the ripping action of the concentrated load on the slab. These
cracks are assumed to have little effect on the connector strength since they
occur away from the high triaxial compression bearing zone. The shear
cracks occur near the compressive zone and hence may affect the triaxial
restraint. Finally,
the splitting cracks occur
in front of
the triaxial
Plan of slab
Shear cracks
Splitting cracks
Concentrated load
P
Ripping cracks
Figure 2.20 Crack formation of slabs in composite girders.
Search WWH ::
Custom Search