Antiseismic steel structural work
AssigneeArbed S.A.
InventorsAndre Plumier, Raymond Baus, Rene Pepin, Jean-Baptiste Schleich
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Abstract
In antiseismic steel structural works of the frame type or of the truss type, which are constituted by columns and by girders fastened to the columns, the girders of different shapes show, at least in the vicinity of one of their extremities, a dissipative zone constituted by a reduction of the actual cross section. The reduction of the actual cross section consists either in differently shaped indentations in the edges of the flanges of the girder or in round or polygonal holes which are regularly distributed over the flanges and have a small diameter.
Claims10
A metal structure, comprising:
- a vertical metal column;
- and
- a metal girder extending horizontally from the column and having an end secured to the column, said girder having a substantially uniform cross-sectional area and having a dissipative zone of reduced cross sectional area near the end of the girder, said dissipative zone being capable of undergoing bending and functioning as a plastic hinge effective to provide resistance to seismic vibrations, said girder further comprising a pair of flat opposed flanges, said flanges extending longitudinally between two opposed edges and a base extending perpendicularly between the flanges, and wherein said dissipative zone comprises opposed indentations in the opposed edges of the flanges.
A metal structure, comprising:
- a vertical metal column;
- and
- a metal girder extending horizontally from the column and having an end secured to the column, said girder having a substantially uniform cross sectional area and having a dissipative zone of reduced cross sectional area near the end of the girder, said dissipative zone being capable of undergoing bending and functioning as a plastic hinge effective to provide resistance to seismic vibrations, wherein said dissipative zone exhibits a first plastic resistance to deformation and said structure exhibits a second resistance to deformation which is greater than 120% of the first plastic resistance to deformation.
Dependencies are inferred from the claim text.