Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by nivoo_boss

  1. nivoo_boss

    Wild differences in manual and FEM calculation results (floor on grade)

    Holy shit, I am a total idiot. I still made a mistake with the units. I'm getting too old I guess. I used concrete's Young's modulus as 34 MPa, when it is of course 34000 MPa :) Now the moment I get by hand calcs is 12,5 kNm/m, which is basically identical to FEM. Anyway, sorry to bother you...
  2. nivoo_boss

    Wild differences in manual and FEM calculation results (floor on grade)

    Hi and thanks! I actually found your site from an old thread here :) But to be honest, I'm not sure how to actually simulate the same results I am trying to achieve by hand calcs. Would this be the correct spreadsheet?
  3. nivoo_boss

    Wild differences in manual and FEM calculation results (floor on grade)

    I made hand calculations with formulas from the handbook below. Please if you can, check if they seem logical to you. I used ChatGPT to translate some terms to English, hope they make sense :) And a screenshot from SCIA Engineer. The Winkler coefficient is exactly the same as in the hand...
  4. nivoo_boss

    Wild differences in manual and FEM calculation results (floor on grade)

    In FEM I am averaging over a 1x1 m square. The given result is average. Peak was something like 17 kNm/m.
  5. nivoo_boss

    Wild differences in manual and FEM calculation results (floor on grade)

    Hello everyone! So I'm messing around with a concrete floor. I have a point load of 60 kN acting on an area of 0,04 m². I calculated the Winkler coefficient as 9,2 MN/m³. The floor slab is 200 mm thick, C35/45 concrete. I have a handbook for concrete floors (it's in Estonian, so no point in...
  6. nivoo_boss

    Expansion joints for a 141x182 m one-storey building

    No, it's in Estonia. No seismic activity here. The building is going to be a factory of steel products, welded structures.
  7. nivoo_boss

    Expansion joints for a 141x182 m one-storey building

    Hey everyone! There's a possibility I have to design a large manufacturing building with external dimensions of approximately 141x182 m. It'll probably have RC or steel columns, steel trusses for roofs and metal deck on top of these trusses. The building also houses a lot of cranes, a few of...
  8. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Another morning, another questions. Would steel bars (I'm thinking 8x70 mm or something) instead of angle sections for stiffeners be okay as well? The manufacturer didn't like the angle sections too much - they thought painting them would be a bit labour intensive.
  9. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Thanks for the tip :)
  10. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Even about 65 mm seems quite a lot to me :). So is it normal that the walls bulge out this much?
  11. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    I'll ask a few more questions then :) Can you give some advice on what the most sensible sections to use as stiffeners might be for this kind of silo? I think I'll use 4 or 5 mm steel plates as main walls and some angle sections (currently L70*7) for stiffeners. The silo I'm designing is for a...
  12. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Thanks! I actually see myself that the normal loads are the ones that govern the design. The other questions are more like just for knowledge. And a pink star has been awarded :) Though I think it's already a second one for you - I think I added the first one on my phone and perhaps it didn't...
  13. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    I did, the discharge loads are governing for this case. I used the formulas 6.24 and 6.25 from the code for this: I did use the factors for the wall friction coefficient, lateral pressure ratio and angle of internal friction according to table 3.1. The loads applied in the model for case...
  14. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Since you are so experienced with silo design I'll annoy you a bit more :) I've calculated the loads, took some time to make an Excel sheet for this stuff, and am now trying to apply them in my SCIA model. A screenshot below (don't mind the missing stiffeners for the hopper, I've not modelled...
  15. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Thanks for great answer! But in your experience would`it be correct to assume hinges between the vertical connections of the 2D walls in the calculation model?

Part and Inventory Search

Back
Top