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  1. BLUEPUPIL

    Web parallel stiffeners

    Yes, you can BLUEPUPIL, but please call them gusset plates and make clear that it’s a truss (axial tension and compression).
  2. BLUEPUPIL

    Web parallel stiffeners

    DrZoidberWoop gave brilliant explanation. KootK (as always) was clear and convincing. Call my anxiety persistence, but after some digging, I have came upon some bridge gusset plates and hot-rolled, open I sections. To my humble understanding, pictures (to some degree) represent the idea of...
  3. BLUEPUPIL

    Web parallel stiffeners

    Adding transverse stiffeners perpendicular to a web (I beams and columns) stiffen the web against out of plane deformations. What about adding only transverse stiffeners parallel to the web? It’s a one storey project involving 6м span, RC columns, simple steel king post roof truss (not tied king...
  4. BLUEPUPIL

    Height of Surcharge

    Cantilever Retaining Wall Weight of Soil=18 kN/m3 Surcharge=36 kN/m2 Height of Surcharge=36/18=2м Write or Wrong? If Wrong, please explain why?
  5. BLUEPUPIL

    twin girder diaphragms

    Single girder Mмax=101kN.м Single girder load 20/2=10kN.м HEA220 CTICM-LTBeam-Mмax(cr)=132kN.м- Fine! IPE300 CTICM-LTBeam-Mмax(cr)=61kN.м- Rejected. To recap, In this particular case the two HEA girders have enough potential to handle LTB even without diaphragms i.e. acting as a typical...
  6. BLUEPUPIL

    twin girder diaphragms

    What to use in order to get the job done fast and relatively easy? 1.Sap 2000 2.Risa 3D 3.Ram- Bentley
  7. BLUEPUPIL

    twin girder diaphragms

    I’m not quite confident, that timber joists have enough bracing potential to restrain steel girders. To simplify it a bit: Girder Span= 9м Load [LL+DL]= 20kN/m 1.First variant- Single girder- HEA360; weight=112kg/m. 2..Second variant- Twin girder with diaphragms (where the unbraced length...
  8. BLUEPUPIL

    twin girder diaphragms

    It’s a simple house project, where the single I-beam in the middle of a spacious living room, became too high(deep), L= 30 feet. The investors insisted on reducing the I-beam size. So I decided to use two I-beams with diaphragms every 3-4 feet, (because there was a „pressure“ to use as little...
  9. BLUEPUPIL

    twin girder diaphragms

    Can I assume (from the picture) that the unbraced length equals the distance between diaphragms?https://files.engineering.com/getfile.aspx?folder=ea114c13-88a5-4491-8e6a-62e8c9b8ff0c&file=1.jpeg
  10. BLUEPUPIL

    flitch beam

    It’s a small flitch beam from a porch. 1..The timber beam is rectangular; height to width ratio 2:1; 6x3(75x150mm) 2..U-sections are facing each other on both sides of the timber beam, with their closed lateral sides; 3..Bolts are placed at the flanges as near as possible. 4..I can tie upper...
  11. BLUEPUPIL

    flitch beam

    A timber beam sandwiched between two cold formed U-sections, all bolted together. Can I assume, that the U-sections are restrained against lateral torsional buckling?
  12. BLUEPUPIL

    Slanted / Raker Beams

    Thank you, jayrod12 The length of horizontal projection of a slanted beam is always shorter than the actual length along the incline. Hence, multiplying the latter with cosine, just equals loads. Thank you, BAretired If the upper connection of the slanted beam is pinned, than there is tension...
  13. BLUEPUPIL

    Slanted / Raker Beams

    Imagine a roof’s sloped beam, similar to a rafter. The roof has a 25 degree pitch angle. The live load is uniform and with downward vertical direction, causing bending in the beam. Is it correct (possible), to reduce the loads [DL and LL], multiplying them by 0.90(cosine 25 degrees) in order to...

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