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  1. daranguiz

    GPW for rebars

    Hi everyone, I'm being asked to look for a US or european standard for welding 2 rebars as you can see in this video: Link The method is called Gas Pressure Welding and in some cases they use another one called Flash Welding. In my case I need a method suitable for site works. In the same...
  2. daranguiz

    structural

    Try Von-mises or tresca criteria.
  3. daranguiz

    Torsion on RHS sections

    For HSS sections you start having issues with LTB something around L=30m and high L/H ratios.I believe that I readed it on the AISC comments.
  4. daranguiz

    Transverse Web Stiffeners for Rotation?

    Stiffners dont help for the stability of a beam (LTB). It's a common misconception. For flexural stability read the theory behind LTB and it's pretty clear. For torsion, the shear stress due to torsion is not travelling around the section in all the length of the beam but maybe it's helping a...
  5. daranguiz

    Braced STMF

    Under seismic loads, this system act as an excentric braced beam, with a plastification zone between the braces. In a I beam, you will have a plastic hinge there that will dissipate energy trough rotation. I don't know how much rotation you will have in that system because you will need to have...
  6. daranguiz

    Analysis of Riveted Structure

    I had the chance to work in a 1888 steel riveted project in France (I let you guess which one). We took some bars with rivets and we tested them in order to have an idea of the shear resistance (with very different results for each one!)
  7. daranguiz

    stability bracing for reducing unbraced length

    Hello, maybe this can help. In some cases when you take into account imperfections, the 2% rule may not be enough. This is from Stability of steel beams and columns - SCI. https://res.cloudinary.com/engineering-com/image/upload/v1475051954/tips/Screen_Shot_09-28-16_at_10.35_AM_evites.bmp...
  8. daranguiz

    Steel Plate Check

    Timoshenko or yield analysis. http://wsmurti.lecture.ub.ac.id/files/2012/10/Perencanaan-Praktis-Garis-Leleh1.pdf
  9. daranguiz

    Plastic Modulus

    @WARose Yeah you are right, but I'm not sure which one to use. The diagrams on the top say "plastic plateau". Also the 4 diagrams come both from the steel plate eurocode. Maybe this could be helpful: https://www.youtube.com/watch?v=mcG0GmUa9KY
  10. daranguiz

    Plastic Modulus

    @WARose It depends of the units you are using for stress. Normally you should use E=210000 or E=200000 MPa if you are using fy in MPa. I made a mistake on my previous post. It should be atan(E/10000).
  11. daranguiz

    Plastic Modulus

    @rb1957 it can happen for not very slender columns. That's why in the AISC or Eurocode the buckling curve only start following the Bleich or Euler shape after a certain value of slenderness.
  12. daranguiz

    Plastic Modulus

    Try EN 1993-1-5 . Annex C. Paragraph c.6 the angles of the curve are: atan(E) and atan (E/10000).
  13. daranguiz

    Composite column - Fire protection 2 hours - Big diameter D=900mm

    Well, I talked to 2 fire design experts and I learned 2 things: - It's unsafe to calculate the resistance of the column under fire by ignoring the concrete. Because the loads under fire are less important, I though than maybe I could check for steel only, but it's an unsafe approach because of...
  14. daranguiz

    Steel design references

    I really like "Steel Structures Design and behavior" by Charles G. Salmon
  15. daranguiz

    Composite column - Fire protection 2 hours - Big diameter D=900mm

    Hello, I have a composite column CHS900x40 that needs to be protected for 2 hours. The calculation method exposed on Eurocode is not applicable for columns with D>400mm. The solution proposed by the EC is either protect the steel for T=350°C or do a thermal calculation (fancy software). I've...
  16. daranguiz

    unusual structural design + dome kinda roof structure

    Hi, can you explain a little more? Can you attach an elevation?
  17. daranguiz

    Bridge Expansion Joint/ Slotted Hole

    @rummann17 When you say that you allow movement "through slotted holes in base plate" does it means that you will have a surface of vertical contact? If it is the case you should account to the friction force resisting the movement given by the friction-factor*normal force.
  18. daranguiz

    Bridge Expansion Joint/ Slotted Hole

    Hi. Are you counting only in the available space do design your expansion joint? Did you consider the effect of the vertical load?
  19. daranguiz

    Stress distribution through concrete

    Hi, the 26.6° of the Eurocode is the maximum inclination of the tie and strut model to compute shear. You can take another angle if you want but it will impact the tie and strut model equilibrum.
  20. daranguiz

    Virtual Wind Tunnel Test (VWTT)

    Hi everyone, Does anyone used a VWTT to asses preliminary Wind loads for a complex building? I know there is Flow Design from Autodesk and HyperWorks from Altair but I've only used the first but i'm not very sure about the results. Thanks, David

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