Roof truss and beam therefor
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United States of America Patent
Stats
-
Jan 22, 1991
Grant Date -
N/A
app pub date -
Dec 11, 1989
filing date -
Jun 12, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The upper chord of a metal roof truss which comprises an elongated beam (10) formed of rolled form metal strip which is of a constant cross-section having longitudinally extending portions (13, 14, 15 and 16) providing flat surfaces of such dimensions that with the application of excessive load upon the beam breakdown of substantially all of said portions occurs simultaneously, and wherein most of the flat surfaced portions are of a width not exceeding that which will comply with following formula (I), where: F.sub.a =maximum permissible compression stress expressed in Mpa, .OMEGA.=load factor, Q=form factor which allows for the effective cross-sectional area, F.sub.oc =elastic buckling stress expressed in Mpa, F.sub.y =yield stress expressed in Mpa.
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Cited Art Landscape
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