CHS X Connection

Notched


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Notes:

  • Notches and cut-outs provide the advantage of quicker fabrication time, especially with laser or plasma cut sections. They also provide improved zinc draining and are particularly useful for CHS joints as they completely avoid zinc traps and air pockets that may occur on the internal edges of the chord member intersections.
  • This form of detailing also eliminates the need for internal venting and allows for easy verification of drainage by galvanizers.
  • To attain a quality coating finish and avoid zinc drips and runs, notches are encouraged on the external face of the hollow members and not in the same plane as chord members.
  • Sharp corners increase stress concentrations and thus encourage cracking and are not recommended.
  • Notch Venting at lower most point allows complete evacuation of zinc. To attain a quality coating finish, notches are encouraged on the external face of the hollow members.
  • In all cases, the location of the vent holes must conform to the requirements of AS/NZS 5131 and AS 4100.

Complete Internal Venting

 


Notes:

  • Some galvanizers try to avoid internal venting for safety reasons, as it is not always possible to verify that it has been completed, as well as being time consuming.
  • Inspection holes of at least 10 mm in diameter are required when it is otherwise not possible to verify that the internal venting is in place.
  • Best practice for internal venting is the complete cut out of the internal section of the joint. If it is not possible to cut out the complete internal cross section, venting in the form of multiple vent holes is adequate as long as the total area of those holes amounts to the area of a circle with a diameter of 50% of the diagonal cross-section of the joint.
  • In all cases, the location of the vent holes must conform to the requirements of AS/NZS 5131 and AS 4100.

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