13.4.1 T-Stub Material Specifications
T-stubs shall be cut from rolled sections and shall conform to either ASTM A992/A992M or ASTM A913/A913M Grade 50 (Grade 345).
13.4.2 Continuity Plates
Continuity plates shall be provided at the column with a thickness not less than the thickness of the beam flange. Continuity plates shall extend to the edge of the column flange, less ¼ in. (6 mm). The continuity plate welds shall be provided in accordance with the AISCE Seismic Provisions.
13.4.3 Single-Plate Shear Connection Welds
The single-plate shear connection shall be welded to the column flange. The single-plate to column-flange connection shall consist of CJP groove welds, two-sided PJP groove welds, or two-sided fillet welds.
13.4.4 Bolts
Bolts shall satisfy the following requirements:
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(1) Bolts shall be arranged symmetrically about the axes of the members.
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(2) Shear bolts in the T-stem-to-beam-flange connection shall be limited to two bolts per row. Tension bolts in the T-flange-to-column-flange connection shall be arranged in two horizontal rows of either two or four bolts.
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(3) Types of holes:
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(a) Standard holes shall be used in the beam flange and column flange.
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(b) Standard or short-slotted holes (with slots aligned parallel to the axis of the beam) shall be used in either the beam web or the shear plate.
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(c) Standard or oversized holes shall be used in the T-stem.
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(d) Standard, oversized, or short-slotted holes (with slots aligned parallel to the axis of the column) shall be used in the T-flange.
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(4) Bolt holes in the T-stubs and beam flanges shall be drilled or sub-punched and reamed.
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(5) The ratio of tension-bolt gage to T-flange thickness, , shall be no larger than 7.0.
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(6) All bolts shall be installed as pretensioned high-strength bolts.
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(7) Faying surfaces of the beam flange and T-stem shall satisfy the requirements for slip-critical connections in accordance with AISC Specification Section J3.9. Faying surfaces shall have a Class A slip coefficient or higher.
User Note: The use of oversized holes in the T-stem with pretensioned bolts that are not designed as slip critical is permitted, consistent with AISCE Seismic Provisions Section D2.2.
13.4.5 T-Stub Shims
- (1) Steel shims with a maximum thickness of ¼ in. (6 mm) may be used between the stems of the tees and the flanges of the beam at either or both locations, subject to the limitations of the RCSC Specification.
- (2) The use of finger shims between the flanges of the tees and the flange of the column is permitted at either or both locations, subject to the limitations of the RCSC Specification.