Composite joist floor system

Abstract

The composite joist floor system includes joists supported by supporting members. Corrugated steel decking is positioned over the joists such that the corrugations are substantially perpendicular to the joists. Self-drilling, self-tapping, stand-off screws are spaced along the length of the joist, aligned with the deck corrugations. These stand-off screws provide the required shear transfer between the joist and concrete slab to form a composite floor system. The placed concrete encapsulates the upper non-threaded shank portions of the stand-off screws and the end of the joists. After the concrete has cured, the resultant system comprised of steel joists, steel decking, stand-off screws, and concrete, act together to form a composite system with greater load carrying capacity and less vertical deflection. The stand-off screws connect the joist upper chords to the concrete slab allowing the joist and concrete slab to act as a unit, by transferring shear between the two joined components.

Description

CROSS REFERENCE S TO RELATED APPLICATIONS[0001]This application is a continuation of and claims priority from allowed, co-pending U.S. patent application Ser. No. 12 / 019,329, filed on Jan. 24, 2008 and entitled “COMPOSITE JOIST FLOOR SYSTEM”, the entire contents of which are incorporated herein by reference.FIELD[0002]This invention relates to the field of structural systems for buildings. More particularly, embodiments of the invention relate to improved composite joist floor systems.BACKGROUND[0003]Large scale, multi-story buildings are typically constructed of steel and concrete. Floors in such buildings may be constructed by spanning wide flange beams or steel joists between structural supports and installing metal decking across the tops of such beams or joists. The decking forms a horizontal surface onto which concrete is placed. Generally, the bottoms of the beams or joists form the framework from which ceilings are hung. The composite construction is typically achieved by us...

AI Technical Summary

Benefits of technology

The patent text describes a method of providing fire protection, continuity, and stiffness at the ends of joists and at slab edge locations during construction. A combination of z-shaped closures and pour stops is used to form concrete. The z-shaped closure has a vertical face with a cutout for the joist end, and is supported by a steel joist supporting member. Concrete is then placed over the corrugated steel decking and into a channel formed by the z-shaped closure and pour stop. The technical effect of this method is improved fire protection and stiffness at the joist ends and slab edge locations.

Problems solved by technology

While joist and deck floor systems have been designed in the past to address one or more of these issues individually, these prior designs are not optimized and integrated with the portions of the support structure of a building to provide an integrated design to address the above mentioned issues in a systematic manner.

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