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  1. MacGruber22

    Single Angle X-braced Frames

    ha...got it. -Mac
  2. MacGruber22

    Single Angle X-braced Frames

    Thanks, dik. I would just say that if braces are at exterior walls where they need to support components and cladding wind from metal stud infill, HSS is really the only way to go even when brace force is low. -Mac
  3. MacGruber22

    Single Angle X-braced Frames

    I will sure to check out ASCE 10. I didn't interpret pham's comment as suggesting to ignore the connection eccentricity, but I don't think that direct column bracing method would work for this condition since a lot of the bracing stiffness will come from the tension force in the brace rather...
  4. MacGruber22

    Single Angle X-braced Frames

    I don't disagree. I used HSS on the last 5-story self-storage I did (different client without all the constraints). It is way more efficient on top of being more predicable. Again, I am stuck where I am. Yeah, not what I have. I have 21 total frames. Average of 30 kip LRFD demand on braces at...
  5. MacGruber22

    Single Angle X-braced Frames

    Jayrod - this is a 7-story storage building 90x170. Pretty unique around these parts. I don't know what to tell you, except that it does, and particularly so when the braces are working in combination with masonry shafts. I do not want anymore lateral load going into my masonry at this point. I...
  6. MacGruber22

    Single Angle X-braced Frames

    I have reviewed related posts but am still unsatisfied. https://www.eng-tips.com/viewthread.cfm?qid=399108 So...what effective length are people using for single angle X-braced frames in R=3 SDC A/B buildings? They are braced at their intersection with a single bolt in an OVS hole. I am not a...
  7. MacGruber22

    Substituting bent plate for hot rolled steel

    http://www.galvanizeit.org/design-and-fabrication/fabrication-considerations/bending My original specification says that the barrier may be either painted or HDG, at the option of the owner. Based on ASTM A143 it seems that my minimum inside bend radii should be 1-5/16" if it is to be HDG after...
  8. MacGruber22

    Substituting bent plate for hot rolled steel

    I spec'd a W24x55 with half the flanges cut off for a parking barrier application. The contractor thinks it would be cheaper to use bent plate. My question is this: Does the orientation of the plate grain come into play when trying to use the newly bent plate for weak axis bending (again...
  9. MacGruber22

    Cap plate design for round HSS or pipes

    Envisioning the different controlling orientation of "local" buckling is easy enough, but understanding why they occur differently still feels fuzzy. If the cap is welded to the HSS (as it always is), how does this not restrain the local crippling? Or maybe it just forces the cripple wave some...
  10. MacGruber22

    Cap plate design for round HSS or pipes

    Regarding cap plate design for round HSS or pipes per AISC equations K1-11 & K1-12: Although the 2.5 to 1 load angle model is permitted, I see no guidance in the steel manual or in design guide 24 for effectively using equation K1-12 (wall crippling) with round tube members. Firstly, it seems...
  11. MacGruber22

    LRFD DESIGN STEEL SECTION (EXCEL SHEET)

    I guess eng-tips doesn't like my excel file attachment... "It is imperative Cunth doesn't get his hands on those codes."
  12. MacGruber22

    Column Stiffeners

    I meant in general regarding column stiffeners. Our firm does not do it, but I believe that we should. "It is imperative Cunth doesn't get his hands on those codes."
  13. MacGruber22

    LRFD DESIGN STEEL SECTION (EXCEL SHEET)

    haithhambadawy, You are probably going to have to ask pointed questions, as I don't know who has time to go through your spreadsheet to hunt down problems (if that is what you are asking). I can comment in general that I find spreadsheets for structural design are much better when they have a...
  14. MacGruber22

    Column Stiffeners

    KootK - out of curiosity, do you provide the same to the fabricator? I am in the process of trying to help our office provide more efficient and fabricator/contractor friendly construction documents. We are in the mid-Atlantic where it seems connection design is usually farmed out. "It is...
  15. MacGruber22

    Column Stiffeners

    Thanks KootK. Easy peasy "It is imperative Cunth doesn't get his hands on those codes."
  16. MacGruber22

    Column Stiffeners

    Have some moment frames where the beams frame into the columns at a 7.5/12 angle. On typical jobs, I provide the column stiffener/doubler requirements to the connection designers. I am wondering if it is reasonable to use the horizontal component of the bottom flange force to check the stiffener...
  17. MacGruber22

    AISC Manual Figure 12-2

    Yeah, I noticed that after I posted. "It is imperative Cunth doesn't get his hands on those codes."
  18. MacGruber22

    AISC Manual Figure 12-2

    Does anyone know where (if anywhere) there is language specifically prohibiting welding of the moment plates to the column web, as graphically excluded from Figure 12-2 (page 12-5) of the 13th edition manual? A few pages later, there is a graphic which shows the plate welded to the web. Part...
  19. MacGruber22

    HSS wall plastification

    You hit it right on the head - "Plastification. In an HSS connection, limit state based on an out-of-plane flexural yield line mechanism in the chord at a branch member connection." "It is imperative Cunth doesn't get his hands on those codes."
  20. MacGruber22

    HSS wall plastification

    Thanks, KootK Initially, I figured I could cover the plate flexural yielding by using the "chord plastification" limit state checked by the first equation. Is there a strict difference between the terms "yielding" and "plastification"? It just seems like yielding for tube connections. "It is...

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