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Recent content by DavidStructural08

  1. DavidStructural08

    Is non-linear staged construction analysis necessary in stage post tensioning transfer girder???

    I am just wondering if I need to do non-linear staged construction analysis in stage post tensioning transfer girder design. It seems to me that since stage post tensioning is performed, it will basically cancelled most, if not all, of the non-linear effects due to stage constrcution. The reason...
  2. DavidStructural08

    ACI 318 Load combinationS for POST-TENSIONING: Where?

    Thanks structSU10. After reading this note, my understanding is that: the 0.3 factor in ADAPT and the 0.5 or 1.0 factor in SAFE are the program selection. In other words, they are the corresponding engineers' selection, NOT something ACI 318 explicitly specified. That being said, SAFE might...
  3. DavidStructural08

    ACI 318 Load combinationS for POST-TENSIONING: Where?

    I am using ADAPT and SAFE PT to design post-tensioning and found discrepancies for the load combinations for serviceability. ADAPT: 1.0D+0.3L+1.0PT SAFE: 1.0D+0.5L+1.0PT 1.0D+1.0L+1.0PT Both programs refer the comb. to ACI chapter 18. However, after checking ACI 02, 05, 08, I must say I...
  4. DavidStructural08

    EFP on retaining wall

    thanks WillisV. What you said is exactly what I wanted to ask.
  5. DavidStructural08

    EFP on retaining wall

    kslee1000, so if the equivalent fluid pressures are the same, the forces the wall will retain are the same, no matter what the volume of the soil is? In other words, 1" soil will put same amount of force on wall as 100' soil? Maybe I did not say clearly, by saying "1" or "100'" wide soil, I...
  6. DavidStructural08

    EFP on retaining wall

    ok guys. I am confused. Please educate me: Say the equivalent fluid pressure is 65 psf/ft for a natural soil. Q1: What is the equivalent fluid pressure from a 1' wide soil, which is retained on both sides by the walls? Q2: What is the equivalent fluid pressure from a 6' wide soil, which is...
  7. DavidStructural08

    EFP on retaining wall

    equivalent fluid pressure
  8. DavidStructural08

    EFP on retaining wall

    ok. My question is really this: are the EFP's different on retaining walls which support 6' wide soil and 100' wide one?
  9. DavidStructural08

    EFP on retaining wall

    For example, a wall of 12' high retaning a soil of same height, but a limited width, say 6'. the question is: what is the EFP on the wall? Is it different than the one for a wall retaining a 100' wide soil? wall 12' high-->|xxxxxxx|<--wall 12' high ^...
  10. DavidStructural08

    live load reduction on wall strip footing?

    well. just curious from code point of view if we could do that.
  11. DavidStructural08

    live load reduction on wall strip footing?

    I know the answer would be yes for strip footing supporting a concrete/CMU load bearing wall. But what if the wall is cold-formed studs spacing at 12"-24" o.c. I think probably we could not get much reduction on live load for wall studs due to the spacing (Width * spacing (12"to24"). But it...
  12. DavidStructural08

    Concrete Footing Size &quot;Rule of Thumb&quot;?

    rrmiv: "Uplift due to seismic, wind, etc. " in original post. Just curisou. What is the direct uplift due to seismic?
  13. DavidStructural08

    Concrete Footing Size &quot;Rule of Thumb&quot;?

    rrmiv, Well, I do not think the tributary area is the same for DL and lateral induced uplift for a braced frame ftg. Assume only braced frames are used, then one ftg in one frame will take an uplift load from a tributary area the same frame will be exposed to. However, the tributary area for...
  14. DavidStructural08

    Tributary width for uplift calc. in light gauge wall studs

    Thanks Dave, but no, I was talking about the downward axial force on wall studs which are parts of shear wall.
  15. DavidStructural08

    Concrete Footing Size &quot;Rule of Thumb&quot;?

    I do not know if these rule of thumb numbers are correct, but I am wondering what is the definition of "tributary area". 1, To be specific, I think this "tributary area" is different for dead load and lateral induced uplift load. You should have a much smaller one for dead load and a much...
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