Steel connections
Connection Design
Choose a reference design code, then open a connection. Each design page gives the code checks, a calculation report and 2D / 3D drawings.
- Connections
- -
Simple / nominally pinned
Angle Cleat
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Web Side Plate
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Flexible End Plate
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Angle Cleat
ASI Connection Design Guide 5 / AS 4100
Open design
Web Side Plate
ASI Connection Design Guide 3 / AS 4100
Open design
Flexible End Plate
ASI Connection Design Guide 4 / AS 4100
Open design
Seated Connection
ASI Design Guide 6 / AS 4100
Open design
Double Angle Connection
AISC Manual Part 10 (Table 10-1) / AISC 360-22
Open design
Single-Plate (Shear Tab)
AISC Manual Part 10 (Table 10-10) / AISC 360-22
Open design
Shear End Plate
AISC Manual Part 10 (Table 10-4) / AISC 360-22
Open design
Unstiffened Seated Connection
AISC Manual Part 10 (Table 10-5, 10-6) / AISC 360-22
Open design
Stiffened Seated Connection
AISC Manual Part 10 (Table 10-8, 10-15) / AISC 360-22
Open design
Double Angle Web Cleats
SCI P212 Section 4 / BS 5950-1:2000
Open design
Fin Plate
SCI P212 Section 6 / BS 5950-1:2000
Open design
Flexible End Plate
SCI P212 Section 5 / BS 5950-1:2000
Open design
Full Depth End Plate
SCI P212 Section 5 (full depth plates) / BS 5950-1:2000
Open design
Double Angle Web Cleats
SCI P358 component models / BS EN 1993-1-8 and UK NA
Open design
Fin Plate
SCI P358 Section 5 / BS EN 1993-1-8 and UK NA
Open design
Partial Depth End Plate
SCI P358 Section 4 / BS EN 1993-1-8 and UK NA
Open design
Full Depth End Plate
SCI P358 4.7 (Checks 1 - 15) / BS EN 1993-1-8 and UK NA
Open designMoment resisting
Welded Moment
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Extended Moment End Plate
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Seismic Welded Moment
AISC Manual 16th Part 11 (directly welded flange FR connection); AISC 360-22 J2, J4, J10; AISC Design Guide 13; AISC 358-22 Ch. 8 WUF-W (seismic)
Open design
Seismic WUF-W
AISC 358-22 Chapter 8 / AISC 341-22 E3
Open design
Seismic Extended Moment End Plate
AISC Design Guide 39 (2023) thick end-plate procedure (Ch. 3 - 5, App. A); AISC 360-22 J3, J4, J10; AISC 358-22 Ch. 6 (seismic 4E / 4ES / 8ES)
Open design
Flush Moment End Plate
AISC Design Guide 39 (2023) thick end-plate procedure (Ch. 3 - 5, App. A); AISC 360-22 J3, J4, J10
Open design
Welded Flange Plate
AISC Manual 16th Part 11; AISC 360-22 J2, J4, J10; AISC Design Examples II.B-2; Design Guide 13
Open design
Seismic Bolted Flange Plate
AISC Manual 16th Part 11; AISC 360-22 F13, J3, J4, J10; AISC Design Examples II.B-1; AISC 358-22 Ch. 7 (seismic BFP)
Open design
Seismic Reduced Beam Section (RBS)
AISC 358-22 Chapter 5; AISC 341-22 E3; AISC 360-22
Open design
Seismic Double-Tee
AISC 358-22 Chapter 13; AISC 341-22 E3; AISC 360-22
Open design
Seismic Slotted Web
AISC 358-22 Chapter 14; AISC 341-22 E3; AISC 360-22
Open design
Welded Moment
SCI P207 (1995) Section 4 and worked example 4.6; BS 5950-1:2000
Open design
Extended Moment End Plate
SCI P207 (1995) Section 2 and Appendix I worked example; BS 5950-1:2000
Open design
Flush Moment End Plate
SCI P207 (1995) Section 2; BS 5950-1:2000
Open design
Welded Moment
SCI P398 (2013) Section 3 and Example F.1; BS EN 1993-1-8:2005 4.10, 6.2.6 and UK NA
Open design
Extended Moment End Plate
SCI P398 (2013) Section 2 and Example C.1; BS EN 1993-1-8:2005 6.2.4 - 6.2.7 and UK NA
Open design
Flush Moment End Plate
SCI P398 (2013) Section 2; BS EN 1993-1-8:2005 6.2.4 - 6.2.7 and UK NA
Open designSplices
Flush End Plate Splice
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Extended End Plate Splice
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Bolted Welded Beam Splice
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Bolted Beam Splice
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Bolted Compression Splice
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Bolted Tension Splice
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Flush End Plate Splice
AISC Design Guide 39 (2023) thick end-plate procedure (Ch. 3 - 5, App. A); AISC 360-22 J3, J4, J10
Open design
Extended End Plate Splice
AISC Design Guide 39 (2023) thick end-plate procedure (Ch. 3 - 5, App. A); AISC 360-22 J3, J4, J10
Open design
Beam Moment Splice
AISC Manual 16th Part 11 (FR moment splices); AISC 360-22 F13, J3, J4; Design Examples II.B-1 plate checks
Open design
Beam Shear Splice
AISC Manual 16th Part 10; AISC 360-22 J2, J3, J4; AISC Design Examples II.A-20 / II.A-21
Open design
Seismic Column Splice
AISC Manual 16th Ed. Part 14 (column splices, Table 14-3); AISC 360-22 J1.4, J3, J4, J5.2, J7
Open design
Tension Splice
AISC Manual 16th Ed. Part 14 (column splices, Table 14-3); AISC 360-22 J1.4, J3, J4, J5.2, J7; Part 12 flange-plated splice force distribution
Open design
Flush End Plate Splice
SCI P207 (1995) end plate splices; BS 5950-1:2000
Open design
Extended End Plate Splice
SCI P207 (1995) end plate splices; BS 5950-1:2000
Open design
Bolted Cover Plate Beam Splice
SCI P207 (1995) 5.2 - 5.4 bolted cover plate splices; BS 5950-1:2000
Open design
Column Splice
SCI P212 (2002) Section 7 (7.5 bearing / 7.6 non-bearing cover plate splices); BS 5950-1:2000
Open design
Tension Splice
SCI P207 (1995) 5.2 - 5.4 bolted cover plate splices; BS 5950-1:2000
Open design
Hollow Section End Plate Splice
SCI P212 (2002) 7.7 RHS / 7.8 CHS end plate splices in tension (CIDECT model, exact bolt tension capacity); BS 5950-1:2000
Open design
Flush End Plate Splice
SCI P398 (2013) 4.4 end plate splices; BS EN 1993-1-8:2005 6.2.4 - 6.2.7 and UK NA
Open design
Extended End Plate Splice
SCI P398 (2013) 4.4 end plate splices; BS EN 1993-1-8:2005 6.2.4 - 6.2.7 and UK NA
Open design
Bolted Cover Plate Beam Splice
SCI P398 (2013) 4.2 - 4.3 bolted cover plate splices; BS EN 1993-1-8:2005 3.6 - 3.10 and UK NA
Open design
Column Splice
SCI P358 (2014) Section 6 (6.5 bearing / 6.6 non-bearing cover plate splices); BS EN 1993-1-8:2005 6.2.7.1(13) - (14) and UK NA
Open design
Tension Splice
SCI P398 (2013) 4.2 - 4.3 bolted cover plate splices; BS EN 1993-1-8:2005 3.6 - 3.10 and UK NA
Open design
Hollow Section End Plate Splice
SCI P358 (2014) 6.7 RHS 'cap and base' splices / 6.8 CHS end plate splices in tension (CIDECT model); BS EN 1993-1-8:2005 and UK NA
Open designColumn bases
Pinned Base Plate
SCNZ 14.1-2007 / NZS 3404:1997
Open design
Pinned base plate
ASI Connection Design Guide 7 (2011), Design Checks 1 - 11; AS 4100:2020 (bolts 9.3.2, welds 9.6.3.10); AS 3600:2018 12.6 bearing
Open design
Moment (fixed) base plate
AISC Design Guide 1 (3rd Ed.) method adapted to AS 4100:2020 (plate, bolts 9.3.2, welds 9.6.3.10) and AS 3600:2018 (bearing 12.6, fixings 19.3); AS 5216 not held
Open design
Seismic Pinned base plate (exposed column base)
AISC Design Guide 1, 3rd Ed. (2024) Ch. 4 (4.3.1 - 4.3.5); AISC 360-22 J2, J3, J8; ACI 318-19 Ch. 17; AISC 341-22 D2.6b
Open design
Seismic Moment base plate (exposed column base)
AISC Design Guide 1, 3rd Ed. (2024) Ch. 4 and 6; AISC 360-22 J2, J3, J8; ACI 318-19 Ch. 17; AISC 341-22 D2.6
Open design
Pinned column base
SCI P212 (2002) Section 8 (Checks 1 - 3); BS 5950-1:2000 4.13; uplift and shear per SCI P207
Open design
Moment column base
SCI P207 (1995) Section 6 and Worked Example 6.10; BS 5950-1:2000
Open design
Nominally pinned column base
SCI P358 (2014) Section 7 (Checks 1 - 4); BS EN 1993-1-8:2005 6.2.2, 6.2.5 and UK NA; uplift and shear per SCI P398
Open design
Moment-resisting column base
SCI P398 (2013) Section 5 and Example E.1; BS EN 1993-1-8:2005 6.2.5, 6.2.6, 6.2.8 and UK NA
Open designNo connections match these filters.