E - Fixed Constructions – 04 – C
Patent
E - Fixed Constructions
04
C
E04C 3/08 (2006.01) B21D 47/04 (2006.01) E04C 3/09 (2006.01) E04C 3/04 (2006.01)
Patent
CA 2271403
A bolted metal joist (in general made out of structural steel and than called steel joists) is a light truss-girder that is resisting solicited bending moments and shear forces by appropriately designed top and bottom cords and web (diagonals and verticals) members. It is assembled with prefabricated members in a shop or at site. The main characteristic separating the proposed steel joist from the steel joists used today is that the elements instead of being welded between themselves at the nodes are connected by bolting. Another distinct characteristic separating the bolted steel joists from the other bolted truss- beams, truss-girders or truss-columns is that at the nodes the elements are connected with a single bolt instead of multitudes of bolts or rivets. The bolted steel joist comprises a pair of horizontal elongated chord members having a "hat" type cross-section for short and intermediate spans (Fig's. l and 2) or two buck to buck angles for relatively long spans (Fig.3). The chord members have bolt-holes through the flat bottom. The holes are spaced along their length. The joist's web comprises of diagonals in tension and verticals in compression or diagonals in tension and diagonals in compression connected to the top and bottom chords. The bolts extend trough the registering holes (single bolt per connection) to secure the chords and truss's web members together. The steel joist may support concrete floor. In such a situation the joist may be designed to have composite action with the concrete slab in resisting the loads. The top chord bolts extend trough the registering holes into the concrete slab and act as studs. The top chord of the joists in the case of concrete slab is positioned to accommodate steel deck serving as a form during the poring of the concrete mix.
Gocevski Vladimir
Gosselin Georges
Gocevski Vladimir
Gosselin Georges
LandOfFree
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