Selection of Frame Column Depths

SidePlate® connection designs work with square columns (e.g. W10x, W12x, W14x, HSS, Box) and rectangular columns (e.g. W18x, W21x, W24x to W36x). Generally, rectangular columns are more economical for moment frames.

Figure A1 - Plan View Comparison of Column Depths

Selection of Slab Edge

SidePlate connection designs are available to accommodate most building envelopes. Approximate minimum slab edge (illustrated in Figure A2) varies depending on member sizes, and is typically the average of the ranges shown in Figure A2. As shown in Figure A3, deeper rectangular columns can be shifted "off grid" to fit within the building envelope, when needed. 

Figure A2 - SidePlate connection Standard and Narrow Sections

Figure A3 - Typical Lateral Column Plan View

Selection of Frame Beam Depths

SidePlate connection designs can accommodate a range of wide flange, HSS, and built-up beam sizes. Deeper beams generally equate to greater economy, and typically the optimal beam depth for SidePlate designs is shallower than the optimal beam depth for other moment frames. Figure A2 and A4 show preliminary dimensions for coordination of the side plates. Dc = Column Depth, Db = Beam Depth.

Figure A4 - SidePlate connection Elevation


When required by the governing code for certain types of construction, steel SidePlate connections shall have a fire-resistance rating like that of a "structural frame."

  • The minimum thickness of sprayed on fire-resistive material (SFRM) for steel SidePlate connection plates, not encased in concrete, shall be determined just like that of a pipe/tube column section with a constant steel wall thickness, which are uniformly heated and protected (the fire exposure of a pipe/tube column is directly analogous to a plate with a 1-sided fire exposure and protection).
  • The SFRM shall have been tested in accordance with ASTM E119 and listed for fire resistive pipe/tube column applications for no less than the required rated time.
  • The contractor shall provide the means for fireproofing across the physical column/beam separation between the bottom beam flange cover plate and the face of the column flange.