2205A.5 Modifications to AISC 358

[OSHPD 1 and 4]

Design Requirements, 2.1 Special and Intermediate Moment Frame Connection Types, Table 2-1 Prequalified Moment Connections modifications.

The prequalified bolted moment connections are not permitted in buildings.

Exceptions:

1. Erection bolts are permitted.
2. The approved moment connection in accordance-with AISC 358 Chapter 10 as permitted by the exception to Section 2206A.2.

The welded side plate steel moment connection shall be permitted provided:

1. The beams shall consist of either rolled or built-up wide flange sections.
2. The biaxial dual-strong axis and column minor axis configurations of the moment connection shall be considered as an alternative system.
3. For SMF and IMF systems, U-shaped cover plates shall be used and the hinge-to-hinge span to beam depth, L_h/d, shall be greater than or equal to 5.
4. The width-to-thickness ratios for beam flanges shall not be less than 3.
5. The spacing for lateral bracing of wide flange beams, L_b, shall include the length of the side plate at beam ends.
6. The extension of the side plates beyond the face of the column shall be within the range of 0.77d to 1.0d.
7. The gap-to-side plate thickness ratio shall range from 2.1 to 2.3.