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  1. xp1

    Small existing structure with cracks in plaster exterior, owner wants to add a slab

    Thank you for your thoughts! The walls are these bricks they have instead of CMU, they're about 6"x9"x18" of solid concrete. I should ask them what exactly the facade is made of, or what kind of plaster it is - I hadn't thought it could simply be that. I asked for more info on the foundation...
  2. xp1

    Small existing structure with cracks in plaster exterior, owner wants to add a slab

    Hello, I'm a structural engineering student working on a small project in Tanzania for a class. We're building a new structure and renovating an older one that has several cracks on the exterior plaster facade. The older structure is 1 story CIP foundation, columns, and ring beam with infill...
  3. xp1

    Wind loads on an irregular structure

    Thanks for the responses, I guess as an intern I'm still missing some of the experience to make judgments comfortably but will try my best. Gonna talk to a superior now about how loads transfer into the diaphragm and then to braced frames, perhaps that will shed some light on these matters...
  4. xp1

    Wind loads on an irregular structure

    I'm looking at sports facility type structure, it's about 400'x400' and steps in the center from an elevation of 155' to 185'. I've attached a picture of it's profile, which basically extends into the page for 400 feet (some reentrant corners though.) We're designing the lateral system and I...
  5. xp1

    Quick question about filter fabric at footings

    Thanks for all the great answers everybody, I appreciate the input. Going to ask them to revise the filter fabric placement and that it shouldn't be below the footing (as you say Thaidavid, this could be more for their benefit than ours,) and I'll let them take it from there. Structural...
  6. xp1

    Quick question about filter fabric at footings

    Ah, I just read somewhere that the filter fabric should surround the gravel because otherwise water will mix with the soil and fill the spaces between the gravel. This makes sense right? Structural Engineering Intern
  7. xp1

    Quick question about filter fabric at footings

    So in the original images, you would only agree with fabric being placed where the light green line is? I'm not sure what the purpose is but the website I provided shows fabric all around the granular fill, even between the fill and natural soil. So you wouldn't agree with these images? I've...
  8. xp1

    Quick question about filter fabric at footings

    This website seems to confirm my thoughts, all the filter fabrics are shown surrounding pipes and gravel but not being placed below footings: http://www.apexhomeinspections.biz/articles/foundation_drainage.pdf anybody know why this is the case though? Structural Engineering Intern
  9. xp1

    Quick question about filter fabric at footings

    Should filter fabric be allowed to extend underneath the footing as shown in the first image (pink)? I feel like I would want to prevent that for some reason. So the second and third images show my own guesses. Although I'm not sure why; bearing pressure is what's important for a wall footing...
  10. xp1

    Preparing to design concrete beams/slab for crane tie-ins

    Hi all, I'm having some difficulty figuring out the load path taken by the forces from crane to strut to embed connection. I've attached several drawings to present the situation, it's pretty typical I believe. The crane has 3 struts tying into 2 "shoes" made of several plates welded together...
  11. xp1

    Nonlinear Large Displacement Analysis Returning Smaller Displacements than Linear

    I don't agree with this; the bending deflections of the tube are going to cause axial deflections in the cables, and I don't think they can be neglected.
  12. xp1

    Nonlinear Large Displacement Analysis Returning Smaller Displacements than Linear

    Yes I believe so - the first time these cables are used, they unwind a bit and therefore stretch greater than a steel rod of the same properties would, correct? Ah yes, I was thinking I would let it rotate, but then try to get it not to - but that's not it because although the forces in the...
  13. xp1

    Nonlinear Large Displacement Analysis Returning Smaller Displacements than Linear

    We reduced the MOE to account for the stretch the new cables will experience, does that make sense? And we figured they wouldn't take much moment anyways since they're so thin. Hm so with that Tee, we'd want to make it remain in that position to ensure equal loading?
  14. xp1

    Nonlinear Large Displacement Analysis Returning Smaller Displacements than Linear

    Thank you both for the responses. I think we've accepted that this is okay, it's a simple model. Patswfc, we're not` worried about the tube displacement; it's an HSS20x12x.375 welded to an HSS12x12.375, 108' long with max distance between cables something like 27' and it's only deflecting 2.5"...
  15. xp1

    Nonlinear Large Displacement Analysis Returning Smaller Displacements than Linear

    I was wondering if anybody else has encountered this, or if my results seem valid. I'm designing a canopy lift, basically a long HSS tube that's going to be picked up and moved. In SAP2000 I modeled the tube and the cables that will be lifting it; for the cables I modeled wire rope as a steel...
  16. xp1

    Using links as column ties?

    Oh! These U bars are only where the vertical bars slope, which happens about 4" below a beam intersection to within the intersection; so for the most part within the beam cage. At all other locations we require closed ties. Would you still think there's an issue with this?
  17. xp1

    Using links as column ties?

    Well for those U bars, I considered them okay because the required lap length is 16" which they're providing (column is 24x24.) However with those links, I was wondering if they needed to be lapped similarly and so maybe U bars had to be used. But KootK I think you're correct, they do just seem...
  18. xp1

    Using links as column ties?

    In this case they're making the diamond tie out of 4 separate links (like 1-legged stirrups; do these have another name?) though, is that still okay? Actually though I didn't know that was a reason for using diamond ties, that's neat; thanks.
  19. xp1

    Using links as column ties?

    Have y'all ever seen links used in columns as shown in the attachment? I understand at some spots in the column, like where vertical bars splice and so they have to slope,it might not be preferable to use square ties since their size will be changing along the slope. However even then I've only...
  20. xp1

    Corner angle embed plate capacity

    Thank you KootK, I see where the moment comes from and the breakout cone now. I haven't checked PCI yet but will look into it, that you for the suggestion. TXStructural, thank you as well for the response. I'll discuss the drawbacks of this connection with the engineer I'm working with. We're...

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