Precast concrete hollow core floor units
are frequently used in multistorey steel-
framed buildings where they bear on to the
top flanges of universal beams. The steel
beam is normally designed in bending in
isolation from the concrete slab and no
account is taken of the composite beam
action available with the precast units.
Although some commercial data are avail-
able, there is no general design guidance
to cover the wide range of material and
geometric variables found in this form of
construction. This paper summarizes
research carried out at the University of
Nottingham on this form of construction
and presents the results of three full-scale
bending tests of steel beams acting com-
positely with proprietary precast hollow
core slabs. The 150 mm deep units were
attached to the universal beams through
19 mm diameter headed shear studs, and
tested in four-point bending over a span of
6 m. For typical geometry and serial sizes
the composite beams were found to be
twice as strong and nearly three times as
sti as the equivalent isolated steel
beams. The failure mode was ductile, and
may be controlled by the correct use of
small quantities of tie steel and in situ infill
concrete placed between the precast units.
To generalize the findings, isolated push-
off tests and eccentric compression tests
were used to study the horizontal interface
shear resistance of the headed studs and
the strength of the slab, respectively.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/5628 |
| Date | January 2000 |
| Creators | Lam, Dennis, Elliott, K.S., Nethercot, D.A. |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Article, published version paper |
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