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  • Users: WWTEng
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  1. WWTEng

    Baseplate to nut contact

    Hello, I have a situation where a steel column (exterior, W12) is leaning due to the foundation heaving about 3/4". The foundation is at least 30 years old, so is the steel. I guess the issue was recently notice by the facilities. In order to correct the issue "temporarily", the site crew...
  2. WWTEng

    12" CMU fire rating

    I am looking at a 12" cmu wall from 1970s. The drawings appear to show the wall grouted @ 48" oc. I am trying for find some fire rating dates for CMU from that era but not finding anything. What be a good resource for this information? Thank you.
  3. WWTEng

    F1554-Gr 55 Gavlanized-Welded Studs

    Is there a load chart available for using these F1554 anchors as welded studs to a plate? Thank you.
  4. WWTEng

    CMU-Cantilever height

    I am looking at aprox 13' tall exterior CMU wall. Non-load bearing. Of course it will have to resists lateral loads (likely wind, since its Michigan). Before I start designing in detail, are there any cmu max height requirements for a cantilever wall? Thanks,
  5. WWTEng

    15' tall, 8" cmu wall, cure time?

    Single story masonry building with precast roof. Wall height aprox 15', 8" cmu. My question is about putting the roof (precast planks) on the wall once the wall is complete. How long should the contractor wait before placing the loading the wall with planks. Thanks.
  6. WWTEng

    Digging around 12' pier

    Consider a 3'x12' deep pier foundation supporting an out door structural column. The contact tor was supposed to pour a pipe within the concrete. The contractor forgot to do that. They are recommending digging down to one side of the pile 9' deep to install the pipe and fill the void with grout...
  7. WWTEng

    Smart grid

    What exactly is a Smart Grid?
  8. WWTEng

    Exp joint-190'x232'

    190'x232' sports arena (single story). Roof is metal deck on steel trusses. The structure itself is concrete a frame (columns wand beams). The temp range is 90 F. But the project is an area where air-conditioning (heat and cooling) may not be functional. I can't decide if an building expansion...
  9. WWTEng

    Short circuit force direction

    Consider a 138kv system with 4" bus for each phase (attached example). In which direction do the SC forces on each bus act? I am trying to figure out if any SC forces will make their way to the foundation or if they cancel out at the beam. Talking to one engineer, he mentioned that the SC forces...
  10. WWTEng

    Ducts for secondary (12 KV) running

    Ducts for secondary (12 KV) running at 90 to each other. At the point of intersection, how much of a separation is recommended and what should the infill be? I saw numbers of 2' to 4' of "fluidized thermal break" but I can't understand why and how this is determined.
  11. WWTEng

    TR fire wall forces?

    Do you consider and blast loads in the design of a fire wall for a transformer?
  12. WWTEng

    Seismic design of concrete water tanks

    I understand that I have to use ACI 350 for concrete. But for seismic forces, what standards should I be using?
  13. WWTEng

    CBC & IBC-Differences (seismic)

    Are there any major difference between the latest 2013 California BC and ASCE 7-10 for seismic design? I recall that in the previous codes some of the R values were different between the two but I can't seem to find any differences. I don't reside in CA and use CBC only occasionally.
  14. WWTEng

    CA-Engineering Surveying and Seismic Principles exams

    I am preparing for these exams but I can't find any example test to figure out the format of the exam. Does anyone know if there are example test references available? Thanks,
  15. WWTEng

    Concrete costs

    I am working on preliminary cost opinion. Where can I find CY costs for concrete (foundations, conc on metal deck etc). Location=Chicago.
  16. WWTEng

    3/4" A325 N bolt-nut penetration

    Should any structural bolt have a complete penetration of the nut or is there some leeway to allow not to? I am looking at some structural connections where the bolt doesn't penetrate the nut entirely. Can a partial capacity be assumed from partial penetration?
  17. WWTEng

    PE registration in CA

    I am planning to register as PE in CA. I am currently registered with NCEES so I think that should make things easy. But I am not sure about "California Civil exams in Seismic Principles and on Engineering Surveying". It appears that I can take this computer based test from my home state (IL)...
  18. WWTEng

    Special vs Ordinary reinforced concrete shear walls

    What are some of the major differences between SRCSW and ORCSW. I haven't used Special in the past.
  19. WWTEng

    Project Controls Engineer

    I have head that term recently and I am not sure if I understand the function and responsibilities of this role. For my information, can anyone share some knowledge. It sounds like its a construction management position.
  20. WWTEng

    TDS for water in concrete?

    Has anyone ever heard of TDS (total dissolved solids) for water that can be used for concrete mixture? This is the first time I heard of the term and I am not even sure if I heard it right. It could actually be TDC? Forgive my ignorance. I alwayws thought water has to be potable but beyoned...

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