Static structures (e.g. – buildings) – With component having discrete prestressing means – Beam – girder – or truss construction
Patent
1976-10-29
1977-09-13
Murtagh, John E.
Static structures (e.g., buildings)
With component having discrete prestressing means
Beam, girder, or truss construction
52640, 52648, 403230, 403409, E04B 118, F16B 902, E04C 310
Patent
active
040473414
ABSTRACT:
The frame structure comprises a pair of spaced apart vertical steel columns with a generally horizontally extending steel beam interposed between but spaced slightly from the columns by spacers carried by the columns. The columns and beam each has a generally H-shape cross-section. Moment inducing wedges are interposed in the spaces between the end faces of the beam and the columns. A plurality of fastening elements are provided at each end of the beam for initially rotating the beam on the spacers and for thereafter fixedly securing the beam to the columns, with the wedges when the fastening means are stressed inducing an upward camber into the beam prior to the application of the dead load. With such a construction the inclined face on each of the wedges is at an acute angle with respect to the vertical. By varying the acute angle or the angle in inclination of the inclined face on the wedge, variable end moments can be induced into the beam. The beam will carry its maximum dead load when the end moments (-) and mid span moment (+) of the beam are numerically equal to (w1.sup.2 /16) but in opposite directions.
REFERENCES:
patent: 3593477 (1971-07-01), Briggs
patent: 3716957 (1973-02-01), Bernardi
patent: 3971179 (1976-07-01), Bodocsi
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