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Influence of Section Geometry on Elastic Buckling and DSM Strength of Purlins

This report discusses the effects of modifying purlin geometry on elastic buckling (Mcr) and the Direct Strength Method (DSM) strength. Four groups conducted experiments focusing on various aspects: Group 1 analyzed the impact of lip length and geometry; Group 2 examined flange width and geometry; Group 3 investigated support placement with springs; and Group 4 transformed Z-sections into C-sections to evaluate changes in Mcr and Pcr. Each group presents their findings to enhance understanding and engineering practices regarding purlin design and structural performance.

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Influence of Section Geometry on Elastic Buckling and DSM Strength of Purlins

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  1. Purlin Play and Report centerline dimensions h = 7.507 in. b = 1.889 in. d = 0.795 in. r = 0.217 in. t = 0.059 in. properties E = 29500 ksi n = 0.3 G = 11346 ksi fy = 55 ksi

  2. Team Exercises Group 1:Team Lip Examine the influence of changing the lip length or lip geometry on the elastic buckling (Mcr), and (if time) the DSM strength – share then report Group 2: Team Flange Examine the influence of changing the flange width or geometry on the elastic buckling (Mcr), and (if time) the DSM strength – share then report Group 3: Team Supports Examine the influence of adding springs or supports at different appropriate locations in the section on the elastic buckling (Mcr) and (if time) the DSM strength – share then report Group 4: Make that Z a C Take the same Z geometry and make it into a C-section with 90 deg. lips. Study the impact on Mcr, Pcr and DSM strength (if time available) – share then report

  3. Group 1: Team Lip

  4. Group 2: Team Flange

  5. Group 3: Team Supports

  6. Group 4: Make that Z a C

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