Static structures (e.g. – buildings) – Imperforate panel with integral reinforcing
Patent
1994-10-20
1996-10-22
Wood, Wynn E.
Static structures (e.g., buildings)
Imperforate panel with integral reinforcing
52334, 52336, 52449, 52450, 52674, 527981, 428183, 428603, E04C 226, E04B 540
Patent
active
055665225
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ribbed plate for a composite slab.
2. Description of Related Art
In building with composite slabs, different profiled ribbed plates made of steel sheet are being used around the world, the steel sheets differing from each other mainly in their outward appearance. One of the most popular ribbed plates in Europe is a steel ribbed plate provided with dovetail-like ribs. Among the best properties of this plate is its favourable appearance, because its lower surface is relatively smooth, and the possibility of attaching heavy loads in the dovetail grooves of the plate by means of special brackets without making holes in the plate itself.
The weakness of, for example, the dovetail profile is, however, an imperfect adhesion to the concrete cast on the plate. Attempts to improve the adhesion have been made by increasing the pattern, for example, protuberances in the upper flange and web of the rib. The problem has, however, not been solved, but in some cases cost-increasing measures have been necessary, for example, deformation of the rib ends in a so called heading.
Because of the vertical component of the adhesion forces and the different bending stiffnesses of the ribbed plate and the concrete, the ribbed plate and the concrete show a tendency to disengage from each other, i.e. they repel each other, which for its part makes the adhesion between the ribbed plate and the concrete weaker. The weak adhesion and the repulsion reaction lead to brittle breaking behaviour. This has resulted in that reduction coefficients of durability have to be used in dimensioning, and essential limitations in the plasticity theoretical dimensioning.
OBJECTS AND SUMMARY
An object of the present invention is to achieve an improved ribbed plate by means of which a complete adhesion of the plate to the concrete is achieved and the above mentioned disadvantages are avoided. The ribbed plate according to the invention is characterized in that the junction of the web of the rib and the upper flange is formed as protruding longitudinal corrugations, and that the transverse corrugations are supported on the longitudinal corrugations and extend over them. The profile of the ribbed plate includes protruding ribs formed in an essentially planar plate, the upper flanges of the ribs being surface profiled in order to achieve better adhesion between the ribbed plate and the concrete of the composite slab, and in which plate the surface profiling of the upper flange of each rib is formed of spaced apart corrugations extending across the upper flange.
One of the advantages of the ribbed plate of the invention is a perfect adhesion to the concrete slab because the cooperation of the surface profiling and the concrete is ensured by a longitudinal corrugation preventing a repulsion reaction between the ribbed plate and the concrete. Hereby it is possible in normal conditions to utilize completely the strength of the plate in dimensioning and to ensure that the production costs are kept at a reasonable level. The adhesion of the ribbed plate to the concrete in a finished ribbed plate has, in fact, been found to be better than the adhesion of the ribbed plates of the competitors.
The other preferred embodiments of the invention are characterized by what is disclosed in the claims hereinbelow.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention will be described by means of examples with reference to the attached drawings, where
FIG. 1 is a top view in perspective of the ribbed plate of the invention,
FIGS. 2a and 2b illustrate the intersections A--A and B--B according to FIG. 1 of the ribbed plate of FIG. 1, respectively,
FIG. 3 illustrates another embodiment of the ribbed plate of the invention,
FIG. 4 illustrates yet another embodiment of the ribbed plate of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 illustrates a ribbed plate 1 according to the invention comprising dovetail-like ribs 2. The novelty lies in the surfa
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.ANG.lander Casper
Mononen Tarmo
Rannila Steel Oy
Saladino Laura A.
Wood Wynn E.
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