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  1. formi

    How do you model RC slab?

    It's more tricky than you might think... When doing hand calcs, you normally assume that the beam acts as a stiff support to a slab, whilst it doesn't... The beam will deflect and the load will be re-distributed somewhere else (to a stiffer element). When you model the beam in your FEA software...
  2. formi

    Walking Column and Resolving Forces

    Interesting topic (walking columns) but it's hard to find any publications/guides on how to design it correctly. WSP uses this concept very often and I managed to find their 'Technical Reference Manual' on walking column design. They do suggest modelling it to derive secondary moments in columns...
  3. formi

    Solid steel section made from steel plates

    Thanks for paper KootK. One more question: what weld type do you recommend for 'normal' WF's with cover plates. e.g. W14x730 with two 4"x20" plates welded to the side of flanges. Would you specify fillet welds or...
  4. formi

    Solid steel section made from steel plates

    Anyway, how would you size a fillet weld for this kind of "radiator" columns If they are axially loaded and there's no bending = no shear? I thought about calculating possible shear due to member imperfection. What do you think? What minimum fillet weld thickness do you recommend?
  5. formi

    Solid steel section made from steel plates

    It's not my design, it's someone's MEng Thesis - structural design of Chicago Spire...
  6. formi

    Solid steel section made from steel plates

    Another approach could be to make every second ply an inch or two narrower than the others. That might allow fillet welds to be used and avoid the need for costly surface prep. I found some MEng project (Chicago Spire) done under supervision of Thornton Tomasetti's Engineers and look what they...
  7. formi

    Solid steel section made from steel plates

    Will you make a WF shape, then weld 2x more end plates across flange end to flange end, welding only from the outside with a V-prep? Then it's a wide flange with cover plates, not a solid section. Thornton Tomasetti successfully implemented this approach (solid steel columns) in The NY Times...
  8. formi

    Solid steel section made from steel plates

    it's a concept not detailed design. Columns buckling lenght 25 ft., loads: 25,000 kips! max allowable column size 30x30"
  9. formi

    Solid steel section made from steel plates

    high-rise building, ground floor columns
  10. formi

    Solid steel section made from steel plates

    Hello everyone! I wonder what's your opinion about welding thick plates in order to make a solid section (e.g. five 20"x 4" plates welded together --> 20" x 20" solid steel section)? Should the welds be CJP's or can be partial penetration groove welds?
  11. formi

    Braced frames - connection type for analysis purposes

    Low seismic risk, CBF's. In the US application I've seen mainly fixed connections but it's probably due to seismic provisions I think. But on the other side, if assign pin condition for beams how to transfer an axial force of around 1000 kips? Maybe sth like in the attached...
  12. formi

    Braced frames - connection type for analysis purposes

    Hello guys! I'd like to find out your opinion about modelling issues of braced frames. As horizontal members of braced frames (girders) are subject to high axial loads, should it be a moment connection between horizontal member and column or not really? I mean, theoritically if we design braced...
  13. formi

    Gusset Plate in Compression

    Thanks KootK! That's what I was looking for! I have one more question guys: why w-shape diagonal braces in braced frames sometimes are oriented "normally" and sometimes are rotated 90 degrees along its axis?? Is it connected with buckling lenght or any seismic provisions? I use buckling lenght...
  14. formi

    Gusset Plate in Compression

    Actually, I design it to Eurocodes but there is no procedures for that kind of connx, so I'm looking for any other sources. In AISC Design Examples (13th Edition) I found example only with diagonal in tension, not in compression what makes a big difference...
  15. formi

    Gusset Plate in Compression

    Hello everyone! I am looking for any example showing design procedure for gusset plate connection in compression. Something like in attached picture. Any proposals where can I find it?:)http://files.engineering.com/getfile.aspx?folder=46b8198d-191f-450f-8f2e-8e7d85d6015b&file=gusssset.PNG
  16. formi

    Combination of steel grades in one section

    Hello everyone! I wonder if it's possible to compose a section made of wide flange column in 65 ksi with welded cover plates in 50 ksi? How to calculate its compressive resistance when there are 2 grades within one section? Any other things that I should be aware of when designing such a section?
  17. formi

    "Walking" column system

    Hello and welcome! Has anybody ever used "walking" column system? Do you guys have any literature/references how to deal with it? (i mean - design procedures or sth like that).http://files.engineering.com/getfile.aspx?folder=079ea01b-5f07-4f59-a266-0eab1d7e779b&file=walk.PNG
  18. formi

    Hefty columns

    Hello everyone! I just want to find out your opinion about hefty columns in high-rise buildings or heavy-loaded structures: which type of column section is more economic - box column or jumbo section + cover plates? Any other pros and cons for each type of section?
  19. formi

    Braced frame connections - modeling issue

    So many men so many minds...

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