To clarify the interaction of shear and torsion in
prestressed hollow core slabs, 15 load tests on single
prestressed hollow core units were carried out. The slabs
were 1.2 m in width, 7 m in length and either 200 or 400
mm in depth. The ends of the slabs were simply supported.
In 13 tests the loads comprised one or two point loads
close to support. In two tests there was a uniform
transverse line load close to one support while the slab
unit was twisted by eccentric loads at the ends.
In ten tests the slabs were placed on neoprene strips
with no end grouting. In these tests the transverse
bending made the slab fail longitudinally first, which in
most cases resulted in a lower resistance than that
predicted using traditional design methods.
In five tests the conditions were more realistic, i.e.
the slab ends were grouted and stiffened by supporting
beams or spreader beams above the slab ends. In these
tests the observed resistances were of the same order or
higher than those predicted using the conventional
calculation methods. However, some observed stiffnesses
and resistances deviated so much from the predicted
results that the conventional calculation methods have to
be evaluated by comparison with numerical methods.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||204|
|Publication status||Published - 2004|
|MoE publication type||Not Eligible|
|Series||VTT Tiedotteita - Meddelanden - Research Notes|
- shear tests
- torsion tests
- hollow core slabs
- test specimens
- load testing
- failure loads