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  • Users: LUGuy
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  1. LUGuy

    Mobile home basements

    I ran into a couple of mobile home foundation issues lately with loan approvals. Searching the appendix of the IRC led me indirectly to the Permanent Foundations Guide for Manufactured Housing, document #4930.3G, as published by HUD. This link should bring you directly there...
  2. LUGuy

    Very old, very stressed steel

    It is ironic that you mention european catalogs. There have been a couple of concidental comments and findings that lead us to believe this was a German method of construction (at the time) Without demolishing enough concrete to see the top flange, it could also be that these are crane rails...
  3. LUGuy

    Very old, very stressed steel

    jheidt2543 - No, I don't know if they are cast iron or not. If not AISC, where would one find design-type information for that? And material testing is beyond the scope of the original investigation for purchase of the building. Does cast iron exhibit different performance characteristics...
  4. LUGuy

    Very old, very stressed steel

    I am trying to justify some preliminary comments to a client purchasing a building constructed around 1905-1910. The roof steel is sloped at about 20 degrees with a 5" concrete slab cast in place above and around the steel beams. The beams are 8" deep rolled steel with a lower flange of 1/4" x...
  5. LUGuy

    SOE Design Requirements

    The contractor's response to my harsh criticisms was that he will have an engineer prepare a calc within a couple of days. I can't wait to see this one... Knowing that the building's foundation and SOE support has already failed, how could any engineer stamp a calc saying that it is...
  6. LUGuy

    SOE Design Requirements

    Are there any means to quantify the effects of vibration on an SOE system? A contractor installed an SOE wall approximately 10ft deep less than 2ft from an existing masonry building on a spread footing. The SOE wall was made from drilling 8" pipes into the ground and sliding steel plates...
  7. LUGuy

    Lateral Pressure from Frost?

    Try searching google for basement cracks. You will find several companies that do inspection and/or repair. Along with that, you will find some excellent pictures of damaged foundations due to lateral pressures. As far as the stepping-that is common at the ends or near windows. And you...
  8. LUGuy

    Generator Foundation "standard" detail

    With all due respect, I am looking for an understanding of why this detail is the way it is, not an answer as to whether it is acceptable for any particular (or generic) loading/soil/environmental condition. That step will come later. I just see too many questionable things in this...
  9. LUGuy

    Generator Foundation "standard" detail

    I was just given one of those "standard details" for a generator foundation to be blessed. Nobody knows where it came from, but it has been used on this MEP's drawings since the dawn of time. To support a 2000 lb generator, the detail has an 18" slab with rebar at 12" on center top and bottom...
  10. LUGuy

    Interior footing minimum depth

    The geotechnical report says all footings are to be 24" wide and to bear on rock. I believe they mean bearing on the weathered layer, not the bedrock which is up to another 5' deeper. I haven't confirmed that assumption yet. The site is in New Jersey. Thanks for the comments! Miscmetals
  11. LUGuy

    Interior footing minimum depth

    If the footing were set on top of the rock - rippable weathered basalt according to the geotechnical report - the footing would protrude through the slab in some areas. Trenching into the rock will allow the footing to be below the slab. Setting the top of footing elevation = the excavated top...
  12. LUGuy

    Interior footing minimum depth

    Are there any minimum depth requirements for spread footings under interior building spaces? We have a single-story masonry building that will bear directly on bedrock. Rock is around 1' below the proposed slab elevation. To minimize rock excavation costs my intent is to excavate rock (which...
  13. LUGuy

    Masonry Partition Walls

    Thanks whymrg, And then walls will have some form of unreinforced flexible joint, i.e. backer rod and sealant, where they butt into structural walls? The loads seem too high at the clip angles. This case has partition walls parallel with bar joists, and the roof deck is only 22ga so I suppose...
  14. LUGuy

    Masonry Partition Walls

    How are masonry paritition walls generally considered on structural drawings? Should they be completely designed including rebar, anchorages top and bottom, etc.? Other types of light/flexible partitions are generally not shown, and this is my first case for masonry. Due to the rigidity and...
  15. LUGuy

    Light Gage Wall Panels with "Grout Cup" Connection

    I am providing unrequested "feedback" from a wall panel manufacturer on a connection that they consider routine and acceptable. They have light gage framed shop assembled wall panels that typically measure 8' x 20' or larger. One connection they occasionally use is a "grout cup" to develop a...
  16. LUGuy

    Lateral Pressure from Frost?

    The cracks were about 24" below grade, and the grade differed on each of the three exposed sides. Also, it was a house under construction, so the gutters had not been installed yet.
  17. LUGuy

    Lateral Pressure from Frost?

    CAP4000 - I appreciate the assumption, and the wishful thinking. Actually, the foundation was designed in accordance with the builder's best opinion and experience. Hmmm. The makeshift pilasters on the 9' wall with 8' of backfill might have stopped the wall from moving, had the cores been...
  18. LUGuy

    Lateral Pressure from Frost?

    Is there a prescribed method for designing against lateral frost pressure? How does the magnitude of pressure exerted by frost compare with hydrostatic pressure? I am considering various causes for cracking in CMU basement walls. I have heard that there has been an above-average occurrence of...
  19. LUGuy

    Strap Beam v. Grade Beam

    In this case, the "strap beams" span from caisson cap to caisson cap. The columns are all concentrically loaded on their footings. The "grade beams" most commonly follow under the exterior single story curtainwall, but don't necessarily tie footing to footing or column to...
  20. LUGuy

    Strap Beam v. Grade Beam

    I am reviewing an old set of plans for a cast-in-place concrete structure. The foundation plans have both strap beams and grade beams called out. The details are not discernibly different between the two. Is there a technical difference between the two types? Does the name somehow tell a...

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