Tubular Truss – Overlapped K-Connection with round HSS
Steel Design Guide 24 - Example 8.2
References
Packer, Jeffery A., Donald Sherman, and Maura Lecce. Design Guide 24: Hollow Structural Section Connections. Chicago, IL: American Institute of Steel Construction, 2010.Details
From the reference:
Verify the adequacy of the welded N-connection (a particular case of K-connection) shown in the free-body diagram in Figure 8-7. Note that the chord moment is necessary for the equilibrium because of the nodding eccentricity. The connection is a balanced K-connection because the load in the vertical compression branch member is equilibrated (within 20%) by the vertical component of the tension branch member [see AISC Specification Section K2(b)]. Note that the thicker branch member is the through branch. For fabrication, the compression (through) branch is tacked initially to the chord, the diagonal (overlapping) branch is then tacked into place, and finally the whole connection is welded together. The loads consist of live and dead loads in the ratio of 2.5:1. Assume the welds are strong enough to develop the yield strength of the connected branch wall at all locations around the branch.
Refer to the figure in the reference for additional details.
Results
| Parameter | RAM Connection | Reference | Difference |
|---|---|---|---|
| Overlapping branch - Chord plastification – Q (intermediate result) | 2.27 | 2.28 | None |
| Overlapped branch (Compression) – Chord plastification capacity (kips) | 193.59 | 194 | None |
| Overlapping branch (Tension) – Chord plastification capacity (kips) | 252.71 | 254 | None |