Effective profiles for building constructions

摘要

Describes a new more efficient double-tee rolling bar comprising a wall and two flanges and having invariable sectional area equal to the cross section of standard profile, wherein each of the shelves is conjugate with the wall by a pair of circular triangles, with the radius of each of them is where the flange width the wall thickness of the I-profile rolling and the thickness of at flange coupling area with increased wall 3 ... 3.5 times the excluded likelihood of fatigue cracks in that zone.