| 主权项 |
1. A construction, comprising:
a vertical column; a horizontal beam; a shear tab having a length oriented vertically and affixed between the column and beam, between a top and bottom flange of the beam; and a lateral bracing system affixed between the column and beam, including:
first and second buckling restraint assemblies, one each on the top and bottom flange of the beam, each buckling restraint assembly including:
a column mounted plate including a horizontal portion and a vertical portion, the vertical portion affixed to the column,a beam mounted plate including a horizontal portion mounted to the beam, anda yield plate connected between the column mounted plate and the beam mounted plate, the yield plate having a smaller width than the column mounted plate and the beam mounted plate, the smaller width of the yield plate defining first and second notches on opposite sides of the yield plate, between the column mounted plate and beam mounted plate, the yield plate yielding in tension and compression to dissipate stress within the construction upon a lateral load applied to the beam and/or column;first and second pairs of spacers, the first pair fitting within the first and second notches in the first buckling restraint assembly and the second pair fitting within the first and second notches in the second buckling restraint assembly, the first pair of spacers being coplanar with the horizontal portion of the column mounted plate, the yield plate and the beam mounted plate of the first buckling restraint assembly and the second pair of spacers being coplanar with the horizontal portion of the column mounted plate, the yield plate and the beam mounted plate of the second buckling restraint assembly;first and second buckling restraint members;a first pair of screws fitting through a pair of holes in the first buckling restraint member, the first pair of spacers and into the bottom flange of the beam to affix the first buckling restraint member to the first buckling restraint assembly and the bottom flange of the beam; anda second pair of screws fitting through a pair of holes in the second buckling restraint member, the second pair of spacers and into the top flange of the beam to affix the second buckling restraint member to the second buckling restraint assembly and the top flange of the beam;the shear tab including a central circular hole, and a first and second oblong holes spaced closer to the top and bottom flanges, respectively, than the central circular hole, the central and oblong holes supporting a weight of the beam against gravity, the central circular hole and the first and second oblong holes enabling rotation of beam upon yielding of at least one of the first and second buckling restraint assemblies without damaging the shear tab, column or beam. |
