The placement of anchors is critical in base plate design. Proper anchor positioning influences the connection’s rigidity, determining whether it behaves as a pinned or fixed support. For instance, base plates resisting moments typically position anchors outside the flanges.
Different loading scenarios create varying load distributions on anchors based on their locations. The table below shows the supported anchor patterns in SkyCiv Base Plate Design Software for each load combination. These patterns ensure anchors are placed in the “Anchor Tension Zone,” which is especially important when anchors are subjected to tension.
AISC, CSA, and AS
| Load Combination | Moment Case per DG1 | Anchor Pattern Recommended | ||
|---|---|---|---|---|
| I-shaped Sections | Rectangular HSS | Circular HSS | ||
| Compression (Pinned) | N/A | Any | Any | Corners |
| Tension (Pinned) | N/A | Flange Web |
Top/Bottom Walls Left/Right Walls |
Corners |
| Compression + Strong-Axis Moment (Fixed) | Low Moment | Any | Any | Corners |
| Compression + Strong-Axis Moment (Fixed) | Large Moment | Corners Flange |
Corners Top/Bottom Walls All Sides |
Corners |
| Tension + Strong-Axis Moment (Fixed) | Low Moment | Corners Flange |
Corners Top/Bottom Walls All Sides |
Corners |
| Tension + Strong-Axis Moment (Fixed) | Large Moment | Corners Flange |
Corners Top/Bottom Walls All Sides |
Corners |
| Compression + Weak-Axis Moment (Fixed) | Low Moment | Any | Any | Corners |
| Compression + Weak-Axis Moment (Fixed) | Large Moment | Corners Web |
Corners Left/Right Walls All Sides |
Corners |
| Tension + Weak-Axis Moment (Fixed) | Low Moment | Corners Web |
Corners Left/Right Walls All Sides |
Corners |
| Tension + Weak-Axis Moment (Fixed) | Large Moment | Corners Web |
Corners Left/Right Walls All Sides |
Corners |
Eurocode
| Load Combination | Loads at T-Stub | Anchor Pattern Recommended | ||
|---|---|---|---|---|
| I-shaped Sections | Rectangular HSS | Circular HSS | ||
| Compression (Pinned) | C | Any | Any | Corners |
| Tension (Pinned) | T | Any | Any | Corners |
| Compression + Strong-Axis Moment (Fixed) | C and C | Any | Any | Corners |
| Compression + Strong-Axis Moment (Fixed) | C and T | Corners Flange |
Corners Top/Bottom Walls All Sides |
Corners |
| Tension + Strong-Axis Moment (Fixed) | T and T | Corners Flange |
Corners Top/Bottom Walls All Sides |
Corners |
| Tension + Strong-Axis Moment (Fixed) | C and T | Corners Flange |
Corners Top/Bottom Walls All Sides |
Corners |
| Compression + Weak-Axis Moment (Fixed) | C and C | Any | Any | Corners |
| Compression + Weak-Axis Moment (Fixed) | C and T | Any | Corners Left/Right Walls All Sides |
Corners |
| Tension + Weak-Axis Moment (Fixed) | T and T | Any | Corners Left/Right Walls All Sides |
Corners |
| Tension + Weak-Axis Moment (Fixed) | C and T | Any | Corners Left/Right Walls All Sides |
Corners |
