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  1. jen4950

    Boundary Elements for Shear Walls

    If you assign a seismic zone to the model, it will calculate your minimum boundary zone for you (function of Pu/P0 etc..)- What I do after that is proportion the steel to fill the required boundary zone, and minimum steel otherwise; (of course depending on the controlling loading scenario, I...
  2. jen4950

    Concrete Shear Wall Design

    I use uniform reinforcing and assign a single pier label for a continuous segment of vertical shearwall (as WillisV mentioned, ETABS splits it up at story levels)- and in a nutshell I have written a script that boils down the design data outputted from ETABS in a spreadsheet, and optimizes the...
  3. jen4950

    Floor Level

    I'm assuming that this house is still under construction without china cabinets in place.. Like dzinegrp mentioned, I'd recommend jacking in lieu of cutting. Why? the condition appears to be at the foundation. If you start chopping on the concrete, you will loose your minimum cover and then...
  4. jen4950

    Composite section design - Why and how?

    "If you get really bored (or excited) you could graph the moment capacity of your beam wrt length and superimpose that on the bending moment diagram to see where you are with design requirements. You can go back and do the same with the shear force, and then again for required moment of inertia...
  5. jen4950

    RE: Trucks vs. Cars

    Fatigue and associated pavement and highway designs are based upon ESAL's- Equivalent Single Axle Loadings if I remember correctly. Strength, Servicability and Fatigue are 3 entirely different beasts. If something is designed for it's limit state strength capacity- that doesn't neccessarily...
  6. jen4950

    Bar Joists on CD's by EOR

    Just trying to be the devil's advocate here- If you have a 6 in 12 sloped roof, and somehow the snow sticks to it, where does the thrust loading go? Pulling numbers out of the air: (30 ft joist)x(8 ft trib)x(20psf Snow)x(SIN(31.3) [6 rise in 12 run]) = ~2.5kips per joist I don't even know...
  7. jen4950

    Complexity of Engineering

    Well- I can't speak for everyone (obviously)- but especially in my Master's program, I was taught and understood the theory behind the software. I know the linear algebra, stiffness derivations, dynamic and optimization algorithms well enough to feel comfortable using commercial software. For...
  8. jen4950

    CONSTRUCTION JOINT @ COLUMN FACE

    We always specify the middle third of the span- and I just wouldn't accept a construction joint at the face of the column- period. You are the one sealing the final design- not the contractor. If you are backed into a corner (situation to avoid in the future, especially if coming from a...
  9. jen4950

    UBC load combinations

    An obvious first step is to contact the Geotech.
  10. jen4950

    Designing A Shear Key

    Typically a shear key is put in place to allow for waterproofing elements (waterstops) to be placed prior to the next pour, in addition to strength requirements. This will typically just be a 2x4. Size the vertical reinforcing for the overturning moment, check the reinforcement for shear...
  11. jen4950

    punching shear

    We use Adapt for production work, but PT Data is good for quick runs..
  12. jen4950

    punching shear

    29' is very manageable with post-tensioning- envision around a 7"-9" PT 2-way flat plate. Of course you need to run your own numbers and ask for help if you are unfamiliar with PT. If you have problems with punching shear, there are several products like Decon Studrails or Lenton Steel Fortress...
  13. jen4950

    RESPONSE SPECTRUM ANALYSIS WITH ETABS

    Assembled Point Masses is the total mass of the struture; at the end of the table it has a total. For instance -> 30,000 kilo-slugs from APM 30,000 kilo-slugs x 32.2 (g) -> 966,000 kips - Effective Weight 966,000 kips x 3% -> 28,980 kips - Minimum Base Shear by Code 20,000 kips total base...
  14. jen4950

    BIM (Building Information Modeling)

    I consider AutoCAD 2006 a BIM, and Revit is clearly BIM.
  15. jen4950

    Graduating soon but with poor GPA...

    I've found that who you know is far more important that what you know.
  16. jen4950

    Good Frame Analysis Software?

    Oh- And I'm using a brand new Dell Dual Xeon machine with 2GB of RAM.
  17. jen4950

    Good Frame Analysis Software?

    Oh- it's about 50 stories.
  18. jen4950

    Good Frame Analysis Software?

    I'm running a 5 million S.F., extremely complex and irregular building- flat PT plates, 3 independent cores, 3 conventionally framed concrete lower levels with additional and generally undefined steel braced frame structure framing into it; building splits off into two towers about mid height...
  19. jen4950

    RESPONSE SPECTRUM ANALYSIS WITH ETABS

    You might notice that if you have a irregular building, the static equivalent seismic forces derived from the response spectra cases are kinda all over the board. Really, it's pretty hard to even tell if you are conservative or not with a static equivalent. If you dive into the theory a bit-...
  20. jen4950

    BIM (Building Information Modeling)

    Locking the scope of work sounds like a God-send; we try to limit scope creep; it's the clients and contractors that squeeze it out of you.

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