Tubular Truss – Overlapped K-Connection with rectangular HSS
Steel Design Guide 24 - Example 8.4
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:
A planar roof truss contains the welded HSS 45° overlapped K-connection shown in Figure 8-9. Note that the chord moment is necessary for equilibrium because of the nodding eccentricity. The connection is a balanced K-connection because the vertical component of the compression branch member force is equilibrated (within 20%) by the vertical component of the tension branch member force [see AISC Specification Section K2(b)]. The through branch is the wider and thicker branch member. 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 shown consist of live load and dead load in the ratio of 3:1. Determine the adequacy of the connection under the given loads. 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 |
|---|---|---|---|
| Overlapped - Local yielding of branches due to uneven load distribution capacity (kips) | 250.84 | 236 | None |
| Overlapping - Local yielding of branches due to uneven load distribution capacity (kips) | 160.71 | 151 | None |