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  • Users: hippo11
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  1. hippo11

    moment redistribution (ACI section 8.4.3)

    Section 8.4.3 states "Redistribution of negative moments shall be made only when et is equal to or greater than 0.0075 at the section at which moment is reduced." My question is, can anyone tell me how or point me to a reference on how to calculate the strain of steel to see if it's equal to or...
  2. hippo11

    anyone know what I should use for helipad live load?

    And what document I can find it in? thanks
  3. hippo11

    Why are W8 sections unlisted in 3rd edn AISC Zx selection table?

    For instance, on pg 5-48 of the 3rd edtition, the selections stop at W10 x 12. But in the 2nd edition, the W8 sections are listed in the Zx table...what's up with that?
  4. hippo11

    how do you compact soils to 95% max Proctor density?

    You see this in geotech reports all the time...but how does the contractor actually do this compaction in the field? And how does he physically verify that he has compacted enough? thanks
  5. hippo11

    percentage of structure cost related to overall construction cost?

    I know it varies by type of structure and type of project, but does anyone know of a resource where I can read about some very rough numbers of structure cost as a % of total construction cost? For instance, in a midrise steel office bldg, is the structure cost typically like 8% of the overall...
  6. hippo11

    slab on grade column blockout re-entrant corner reinforcement?

    It seems to be widely accepted that slab on grade tends to crack at re-entrant corners. Please see my attached image for my question. --Does everyone here put rebar at column blockouts below the sawcut jt at re-entrant corners to prevent full depth cracking? --Why or why not? --Please...
  7. hippo11

    min embedment length for anchor rods?

    just to clarify...i am looking simply for a min embed length rule. strength is a separate issue that i've taken care of...i was just wondering if there's some min out there, perhaps for serviceability, for cover, etc, but it sounds like there used to be a min that was removed from the base...
  8. hippo11

    min embedment length for anchor rods?

    concrete...why does it matter if it's in shear or tension? just worried about cover right now
  9. hippo11

    min embedment length for anchor rods?

    Can anyone point me to a reference? Assuming strength works of course. I have heard 12*d as a rule, but haven't found any documentation...thanks
  10. hippo11

    Compilation of structural weight (psf) by bldg type/material?

    Of course averages don't tell the whole story, but think about it... for instance, if your design for a simple 4 story steel framed office bldg has a structural weight of 12 psf, and a compilation of other bldgs in a similar seismic zone have roughly 7 or 8 psf, it's a good idea to see if you...
  11. hippo11

    Compilation of structural weight (psf) by bldg type/material?

    This would be quite helpful to use as a check to see if your structural design is reasonable. I'm sure contractors would be interested as well. Does anyone know of such a publication? For instance, data on the average structural psf of: steel framed office building, 20 stories flat plate...
  12. hippo11

    ACQ preservative and galvanized vs. stainless stell

    I was looking at the Simpson catalog on pg 11, and it recommends that all connectors be stainless steel, not galvanized, if the wood in contact with the connectors has a preservative content of ACQ/MCQ > 0.40 lb’ft3 … So my question is, for a project on the beachfront, should we anticipate...
  13. hippo11

    what it is the reason for fly ash replacement limits?

    Looking at Table 4.2.2.9 of ACI 301 (or Table 4.2.3 of ACI 318), there are limits for fly ash, slag, silica fume, etc, for concrete subject to DEICING chemicals. Does this mean for concrete NOT subject to DEICING (i.e. most indoor concrete), there are NO replacment limits for fly ash, etc...
  14. hippo11

    why does the self-wt of a masonry wall flow triangularly?

    If you are designing a lintel or bond beam supporting a CMU wall above an opening, you can design for the self-weight of only the triangular area (striking an imaginary line at 45 degrees upward and inward from the ends of the beam)...of course unless there's a vertical control joint, in which...
  15. hippo11

    do existing unreinf CMU walls need to follow TMS 530 seismic

    Thanks Dick...however, do you know if I have to upgrade all these existing walls to the min reinf required by current TMS provisions for SDC C?
  16. hippo11

    do existing unreinf CMU walls need to follow TMS 530 seismic

    RVSWA, it's a 3-story concrete slab-and-concrete beam framed dormitory built in the 50s. The partition walls and perimeter walls are 4" thick CMU (apparently unreinforced)...and the attic level is a stick-framed hip-and-gable deal anchored into the concrete slab below. Currently if you go into...
  17. hippo11

    do existing unreinf CMU walls need to follow TMS 530 seismic

    I'm working on an old unreinf CMU wall in a renovation job and it looks like there is no reinf in the wall, in the whole building...it's not load brg or part of the lateral system...just backup to brick... It's an old bldg but it's located in SDC C in Alabama... The masonry TMS code has min...
  18. hippo11

    can brick ties be attached to existing CMU backup?

    Silly question...if you have an existing CMU block + brick veneer wall system, and a big portion of brick is damaged, can you simply strip off the brick and attach new brick ties to the existing CMU, then lay in new brick? Or do you have to replace the CMU backup also so that you can embed...
  19. hippo11

    IBC '06: when are Special Inspections required?

    The best I can tell from section 1704.1, special inspections are ALWAYS required EXCEPT: 1. When the bldg official says it's not required 2. When no professional engineers or architects were involved in the bldg design 3. The occupancy is R-3 or U as defined by the IBC My particular...
  20. hippo11

    why are partition studs spaced @ 16"?

    Why is 16" the magical number? Does this have to do with standard drywall panel sizes?

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