Connections
Connections is the editor tab where a modelled structure becomes buildable steel. The whole model turns grey, you pick one node at a time, and the app proposes the connection types that actually fit that node, sizes them against the forces the analysis already computed, and draws the detail. Nothing here is typed in by hand: the demand comes from the analysis run, not from a form.
What the tab does
Every node of the model is a candidate connection. Opening one shows what the app understood about it: which member is the supported beam, which is the support, the angle between them, the profiles involved, and the internal forces at that end. From that reading it filters a catalogue of 26 connection models down to the ones that are physically possible at that node, and marks one as the default.
A connection has three possible outcomes, not two
Pass and fail are the obvious ones. The third exists because a calculation can be impossible rather than unsatisfied, and calling that a failure would be a lie in both directions.
Verified
Every limit state was computed and every ratio is at or below 1.0. The governing one is shown as the headline.
Not verified
At least one limit state exceeds 1.0. The list names it, and the calculation memo shows the formula that got there.
No calculation
A capacity came out as zero with demand present, usually because the node has no resolvable support. This is not a failure and is never counted as one, but it is not an approval either.
Where the numbers come from
The shear, axial force and moment used to size a connection are read from the element forces of the analysis, at the exact member end that meets the node. Run the analysis before detailing: with no results, the app has no demand to size against and will say so instead of assuming zero.
A saved connection keeps the verification that was stamped when it was created. Reopening the project does not recompute it. To refresh a stamp after changing profiles or loads, reopen the node and let it verify again.
Where to go next
The catalogue
26 models in 7 families, with stiffness, transmitted forces and how each one is verified.
Why a model appears
What the app reads from the node, and why a card can be unavailable.
The verification panel
Reading the demand, the limit states and the governing ratio.
Free-hand tools
Nine tools to cut, weld, extend and plate a node by hand.
Base plates
Anchors, grout, concrete bearing and shear transfer at the column base.
Model a frame, run the analysis and detail a node in the same browser tab. Free.
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