ProtaSteel 2021 - Quick Start Guide 16
• Welded Gusset Plate Connection
• Corner Welded Gusset Plate Connection
• Truss Seating Connection
For the above connections, detail design report can be produced which includes both geometric checks
and capacity checks. In addition, intermediate calculations, references to the appropriate clauses of the
design code, and corresponding equation are shown for easy checking.
Basic material capacity checks are performed for the following for the standard connections :
• All Bolted & welded gusset plate
• Purlin & Girt
• Splice connections
• Flange Plate Moment connections
For the above connections, the following basic material strength checks are performed:
• Plate bearing check
• Bolt shear & Bolt tension check
• Weld stress check
• Plate tension & plate bending check
The above are basic checks and not clause by clause code specific checks. No design report can be
produced. You are advised to perform your own additional calculation checks if required.
The force used in the automatic connections are obtained from the higher of the two values :
1. The critical design forces of the connected members imported from ProtaStructure
2. User-defined Capacity Ratio in the Profile Properties > Detailing Definitions.
Capacity Ratio = Design Force / Maximum Member Capacity (equal less than 1)
This is to prevent unrealistic design when the design forces are very small or negligible.
For example, in determination of the number of bolts for a simple beam to beam fin plate :
• The critical design shear imported from ProtaStructure is 30 kN. This requires 1 number of bolts.
• The Shear Capacity Ratio of the beam is set to 0.3. This works out to be 100 kN which requires 2
number of bolts.
• The final design shear force used is 100kN and hence 2 number of bolts is chosen.
There is no check or design at all for the following connections: Haunch Connection, Apex Haunch
Connection, Direct Welding Connection, Base Plate Without Design, Eaves Beam Connection, Profile Fit
Connection, Sag Rod Connection & Sag Rod Holes, Welded Pipe Connection, Beam to Wall Connection,
Apex Truss Gusset Connection & Truss End Plate With Gusset Plate Connection.
Before performing connection design, we should customize the default design parameter :
➢ Go to File → Settings → Project Preferences
➢ Ensure that Design Standards for Connections is set to EC3
➢ General Overdesign Factor for Connections = 1
This means that the connections will generally design for 100% of the member capacity. This setting
works in combination with capacity ratios of the connecting members (changed via Profile dialog →
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