Australian Shear Stud Connectors — AS 2327 Capacity Table
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Reference for headed shear stud connector design per AS/NZS 2327:2017 for composite steel-concrete beams. Covers stud dimensions, shear capacity, degree of shear connection, and stud layout requirements.
Shear Stud Dimensions
| Stud Diameter | Shank Area (mm²) | Height (mm) | Head Diameter (mm) |
|---|---|---|---|
| 16 mm (TD16) | 201 | 75-125 | 25 |
| 19 mm (TD19) | 284 | 75-150 | 32 |
| 22 mm (TD22) | 380 | 100-175 | 35 |
| 25 mm (TD25) | 491 | 100-200 | 40 |
Design Shear Capacity — AS/NZS 2327 Clause 6.6.3
φVsc = φ × 0.7 × Asc × fus (steel failure) φVsc = φ × 0.4 × d² × sqrt(fc′ × Ec) (concrete failure)
| Stud | fc′=25 | fc′=32 | fc′=40 | Steel | Design |
|---|---|---|---|---|---|
| TD19 | 76 kN | 80 kN | 82 kN | 76 kN | 65 kN |
| TD22 | 94 kN | 100 kN | 105 kN | 102 kN | 87 kN |
| TD25 | 115 kN | 125 kN | 132 kN | 131 kN | 106 kN |
Design value = min(steel, concrete) × φ=0.85
Stud Layout Requirements
| Requirement | Value |
|---|---|
| Min centre spacing (longitudinal) | 5d (95 mm for TD19) |
| Min centre spacing (transverse) | 4d (76 mm for TD19) |
| Max centre spacing (longitudinal) | 6×slab thickness or 900 mm |
| Min edge distance | 25 mm |
| Min cover over head | 20 mm |
| Stud height above flange | ≥ 3d (57 mm for TD19) |
Worked Example
Problem: TD19 studs, fc′=32 MPa, total shear Vh = 1200 kN.
Solution:
- Stud capacity = min(80, 76) × 0.85 = 65 kN
- Full interaction: N = 1200/65 = 19 studs
- Layout: 2 rows × 10 studs at 150 mm centres
- Ensure edge distance ≥25 mm and spacing ≥5d=95 mm OK
Design Resources
- [[Australian Steel Grades|/reference/australian-steel-grades/]] | [[Australian Steel Properties|/reference/australian-steel-properties/]] | [[Australian Beam Sizes|/reference/au-beam-sizes/]] | [[Australian Bolt Capacity|/reference/australian-bolt-capacity/]] | [[AS 4100 Beam Design|/reference/as4100-beam-design-example/]] | [[All Australian References|/reference/]]
FAQ
What is the standard shear stud size in Australia? TD19 (19 mm × 100-125 mm) is most common. Capacity typically 65-80 kN depending on concrete strength.
What governs stud capacity? For TD19 in fc′≥32 MPa, steel failure governs (76 kN steel vs 80 kN concrete). For larger studs, concrete failure governs.
What is partial shear connection? AS/NZS 2327 allows 40-100% shear connection. Minimum depends on span: 40% for L≤5m to 100% for L≥20m.
Educational Use Only — This reference is for educational and preliminary design purposes only. All structural designs must be independently verified by a licensed Professional Engineer (PE) or Structural Engineer (SE) in accordance with AS 4100:2020 and all applicable Australian Standards. Results are not for construction.