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  • Users: ACE58
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  1. ACE58

    Backfill at reinforced masonry wall

    A project currently under construction is steel framed with 8" bypass girts starting at 5'-4" above finished floor. From the floor to +5'-4" there is an 8" masonry wall with vertical #5 at 1'-4"c/c full height from the foundation. All cells are grouted full, full height. There is horizontal...
  2. ACE58

    Residential Truss Engineering Logistics

    I've been doing wood framed commercial buildings here in Ohio for number of years - mostly nursing homes, doctor's offices, etc. My structural drawings include roof truss framing plans showing my interpretation of the best way to frame the building, with girder trusses & concentrated loads...
  3. ACE58

    Soil Boring Layout by SER

    Actually, I think it's beneficial to handle it this way. Frequently the soils engineer is hired when the building drawings are in the schematic or design development phases - without actual framing plans, column layouts or loadings called out on the plans. By this time I've usually visualized a...
  4. ACE58

    Designing slab on metal deck

    Just a word of warning, whether you use composite deck or standard slabform - check your design for possible floor vibration issues. When you reduce your dead load, you also reduce the vibration "damping" that the dead load provides. If the floor space is for open offices, lobbies, classrooms...
  5. ACE58

    Top of Steel vs Deck Bearing

    I agree that TOS creates confusion; is it "top of steel beam" or "top of steel joist"? I'm considering a change to "Bottom of Roof Deck" (BORD), because we have had projects that have had metal, vented wood & plywood roof decks (of different thicknesses)over steel beams, steel joists or light...
  6. ACE58

    Arched Loose Lintel

    For short spans & shallow arches, I usually spec. rolled angles w/ horizontal extensions at the ends. Larger spans may require rolled wide flange shapes + rolled bottom plate & masonry anchors back to the beam web. Although some may argue that masonry arches are able to self-support, I've seen...
  7. ACE58

    How to Connect Sloped Steel Roof Decking to Masonry Wall?

    Similar to JedClampett's response, I have used a continuous metal plate (usually 4" to 6" wide) w/ 1/2" diameter anchor studs shop welded to the underside of the plate. The slope of the plate matches the slope of the roof & the anchors are grouted into the top courses of the masonry wall(on top...
  8. ACE58

    Steel Connection Beam to Beam Existing Condition

    I prefer the second one also. The question that comes to my mind is if the remainder of the existg. 12" beam section in Detail 1 is adequate for the end reaction requirements. Additional reinforcement steel may be required.
  9. ACE58

    AISC Shapes 8B10

    Since the 8X4 B designation contained (3) different beams as a sub-category, they apparently dropped the "X4" & added the weight per ft. (10, 13 or 15) to differentiate which size was desired.
  10. ACE58

    AISC Shapes 8B10

    I have a copy of the 6th edition of the AISC Manual of Steel Construction (1963) & it lists Miscellaneous Shapes (M) & Light Beams (B). The shape you asked about is basically an early W8x10 with some differences. I have scanned the relevant pages & attached them. As you may have guessed, the...
  11. ACE58

    Steel beam interruption of bond beam

    dhengr is correct in assuming that the two beams are parallel; sorry that I didn't include that in my original post. On the subject of movement of the hairpin rebar - I don't anticipate any movement after the masonry is grouted tight around the steel beam ends & the rebar is tied to the bond...
  12. ACE58

    Steel beam interruption of bond beam

    In the event that a continuous masonry bond beam's bottom elevation is the same as the bottom elevation of a steel beam (lintel, floor beam or roof beam), is it necessary to provide attachment between the bond beam reinforcement & the steel beam for continuity? We typically anchor lintel & floor...
  13. ACE58

    Unreinforced masonry pilasters

    Walked through the bldg. yesterday with the (2)CM field reps, (2) new masonry overseers & (2) masons. They will submit a detailed description for the fix of each pilaster. It boils down to providing temporary support for the structure while they break into the wall at each deficient pilaster &...
  14. ACE58

    Unreinforced masonry pilasters

    There were some unexplained cracks in the beam bearing areas of some of the masonry walls of a 2-story building that I designed. Many of these locations were designed with reinforced masonry pilasters (projected or flush-face). The second floor beams are set, the concrete floor has been poured &...
  15. ACE58

    Masonry Joint Reinforcement

    I used to specify truss-type, but the masonry contractors were always asking to substitute ladder-type because the truss wires interfered with the placement of vertical reinforcing bars.
  16. ACE58

    Strength of concrete cantilever

    The scale of the sketch was 1 1/2" = 1'-0". The function of the drain isn't in question. What the condition is termed is irrelevant in my eyes - the analysis or evidence of future failure is the concern. The question is if dynamic loads from repeated heavy truck traffic will cause this concrete...
  17. ACE58

    Strength of concrete cantilever

    Sorry it took so long to reply - out of the office. A sketch of the trench drain is attached. The solid lines indicate proper installation & the dashed lines indicate what was installed (worst case). The contractor is willing to fight this; he says that his "experts" say that the drain...
  18. ACE58

    Strength of concrete cantilever

    Unfortunately, construction isn't free. We estimste that it will cost approximately $3200 to remove & replace a 9' section; we're looking at replacing 8 or 9 sections. Neither the owner nor the contractor want to absorb that cost. The crack will most likely develop at floor level, parallel with...
  19. ACE58

    Strength of concrete cantilever

    A new truck maintenance building has a 183' long fiberglass trench drain with variable depth of 6" to 13" below fin. floor. The top of the trench drain is a attached to steel angles w/ Nelson studs that were cast into the thickened concrete floor. Due to improper bracing & over-vibration of the...
  20. ACE58

    Light pole foundation

    I never rely on any program without checking its results before putting it to regular use. Doing it by hand is fine until you are handed multiple requests - each with different lengths, fixtures, EPA ratings, soil conditions, etc. In the past few years our firm has dropped from 4 engineers to 1...

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