{"id":33657,"date":"2026-04-27T12:58:38","date_gmt":"2026-04-27T12:58:38","guid":{"rendered":"https:\/\/protasoftware.com\/technical-manuals\/structural-modelling\/working-with-purlins\/"},"modified":"2026-06-19T12:37:45","modified_gmt":"2026-06-19T12:37:45","slug":"working-with-purlins","status":"publish","type":"wiki","link":"https:\/\/protasoftware.com\/wiki\/working-with-purlins\/","title":{"rendered":"Working With Purlins"},"content":{"rendered":"
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Define a New Purlins
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Before inserting purlins, trusses\/beams\/ steel frame members must be defined. <\/span><\/span><\/span>
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To define purlins:<\/span><\/span><\/span>
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  1.  Click on the "<\/span><\/span>Purlin<\/span><\/span><\/i>" button from toolbar or you can use command line at right bottom corner. There are two purlin insertion methods; Insert Using Two Members<\/b> or Insert Using Multiple Members<\/b>.
    <\/span><\/span> <\/span><\/li>\n
  2.  To Insert Using Two Members<\/b>, select the first truss or frame member followed by the second one where the purlins will be inserted. Intermediate trusses\/beams\/frame members will be automatically detected. In order to consider purlins as simple beams, there should not be any intermediate trusses\/beams. Otherwise, purlins are considered as continuous beams.  <\/span><\/span><\/li>\n
  3.  To Insert Using Multiple Members<\/b>, press ENTER after selecting all the truss or frame members. This function allows you to pick a specific frame members as the supporting members. <\/span><\/span><\/li>\n
  4.  Purlin dialog will be loaded, purlin geometry and input loading can be specified by following:                                                                                                                                                                                      <\/span>
    <\/span><\/li>\n
  5. \n
    In the Geometry dialog
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