HSS Hollow Structural Sections - - PowerPoint PPT Presentation

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HSS Hollow Structural Sections - - PowerPoint PPT Presentation

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! Lengths of members? Waste? ! Available sizes – Capability Tool Lengths of members? Waste? Available sizes Capability Tool Lengths of members? Waste? Capability Tool

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! Effective weld length – for elements transverse to the HSS face

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  • Reduced effective length
  • Load is highest at ends closest to sidewalls and

smallest in the middle

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! Dr. Sherman’s research found it is 4 times more expensive to specify a through plate than a shear plate welded to the face of the HSS wall. ! Increase your wall thickness to avoid a through plate connection. ! Other options: ! WT ! Double angle

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! When to specify a through plate shear connection ! Axial loads ! Delegated connection engineer and column is too thin ! When NOT to specify a through plate shear connection ! As your standard connection!!!

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! Continuous beam w/column below (and above and below) ! Directly welded ! Through-plate ! Cut out/exterior diaphragm plate ! Welded tee flange ! End plates ! Interior diaphragm plate

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! Cut column in two locations to allow top and bottom flange plates to pass through ! Must allow for combined effects

  • f mill, fabrication, and erection

tolerances (use shims in the field) ! Use PJP or CJP weld for plate to column connection instead of fillet if necessary

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! Shop-weld with stub beams or field weld

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! Top and bottom plates fit around the column (column is continuous) ! Plates wider than through plate connection ! Plates can be field welded or shop welded ! Can be used to transfer moment to column instead of through (framing on one side only)

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! Perpendicular framing is ideally shallower than (or at least same depth as) moment connected beams ! Beam stubs can work well with this connection also! ! Strap angles

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! Convenient when connecting to only one side of the column ! Moment transfers to the column rather than through the column

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! Flange width of beam should be as large or larger than column width ! Buckling strength of HSS side wall should be checked.

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