| 摘要 |
A portal building frame formed of asymmetrical metal sections comprises a roof frame member supported on columns by means of knee connectors which telescopically engage with the roof frame member at each end thereof and with the columns. The connectors are secured to the roof frame member and the columns by bolts through both the webs of the metal sections and through flanges thereof, the bolts through the webs being longitudinally spaced by a distance corresponding to the lateral dimension of the webs. The knee connectors are each fabricated with reinforcing plates on the flanges of the metal sections at the joint between the sections forming the connector, and a stiffening plate is welded between mitred ends of the sections to the webs, flanges and reinforcing plates to form the one-piece connector. Secondary frame members are supported by the roof frame member with brackets fastened to the web of the roof frame member and to the secondary frame members so that the load transmitted by the brackets is through or close to the shear center of the metal section of the roof frame member. |
