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  1. mikhelson

    strip method for two-way slabs

    @asixth: Do you only use the moments from your FEM slab models or do you also accept shear and torsion values? From my experience, people tend to derive the shears for a plate from tabulated coefficients or from some other hand method, rather than using, say, SAP2000 values. And yes, Roark's is...
  2. mikhelson

    strip method for two-way slabs

    So noone is using the strip method these days? A coworker referred me to exactly what I was looking for in Moments and Reactions for Rectangular Plates by W.T.Moody. The tables give coefficients for finding moments and reactions for plates of simple shapes and load distributions. The booklet is...
  3. mikhelson

    strip method for two-way slabs

    @msquared48: No, I mean reinforced concrete.
  4. mikhelson

    strip method for two-way slabs

    The strip method (by Hillerborg and Wood & Armer) seems like the most convenient way to analyze a two way slab with irregular dimensions or boundary conditions (aside from FEM modeling). I have a few questions about the method for those who use it in their practice: Does ACI 318 allow strip...
  5. mikhelson

    How do you document your calcs?

    Thanks everyone for your replies. blackmaddog: did you consider sketching in CAD and then importing into MathCAD or whatever you use for reports? I know that MathCAD interfaces with AutoCAD.
  6. mikhelson

    How do you document your calcs?

    Pretty much everyone on this forum has to do this day in and day out. What do you use to document your calculations? MathCAD, spreadsheets, LaTeX...? Are you satisfied with the tools you use? Can you copy & paste your calcs in the report, or do they require additional editing? Thanks!
  7. mikhelson

    structural engineering grad school: which courses?

    civilperson: No, no courses specifically on codes are part of the grad program, although they're probably reviewed to some extent in advanced design classes. My understanding is that it's quite common for employers to pay for their employees' PE/SE preparation classes if they pass the test.
  8. mikhelson

    Grade beams

    I'm sizing square shallow footings for column load. The footings will be tied with grade beams. My understanding is that I should size the footings without taking into consideration the grade beams. In other words, when calculating the bearing capacity and settlement, I don't model the footings...
  9. mikhelson

    structural engineering grad school: which courses?

    Where I live (San Francisco), no reputable structural firm hires undergrads -- at least, I don't know anyone at my school who was able to score an internship doing structural work before they graduated. I'll be interning at a structural firm during the summer in between undergrad and grad...
  10. mikhelson

    structural engineering grad school: which courses?

    B16A2: You've identified precisely the reason for this post. I enjoy taking classes and I love my field. In fact I'm thinking of staying 3 semesters in the grad program rather than the required 2 just to take a few more classes before I leave school for good. But just as you said, I have a poor...
  11. mikhelson

    opening in 1-way slab

    271828 and kslee1000: Thanks for your thoughts. What if I used ribbed slab instead of beam-and-slab system? Would you still recommend framing the opening with beams? I'd prefer to avoid these if possible, so as to simplify formwork.
  12. mikhelson

    opening in 1-way slab

    I have a slab with a 2:1 dimension ratio overall. This is complicated by an approximately square opening adjacent to one of the beams, between which the rc slab spans. The slab span is about 30', while the opening is approximately 10' wide. My intuition is that this shouldn't force me to...
  13. mikhelson

    structural engineering grad school: which courses?

    COEngineeer: I actually planned not to go the thesis route. I have the option of doing a coursework only MS. Why would you recommend doing a thesis?
  14. mikhelson

    structural engineering grad school: which courses?

    I'll be going to a Master's program in structural engineering with the intent of joining a practice in a year. I'd like to seek your advice as to which courses are most helpful for someone like me who hasn't yet decided between highrise building design and infrastructure (bridges, tunnels). The...
  15. mikhelson

    How many beam sizes to use

    RHTPE: Thanks for your advice. I'm surprised at how the contractor suggests to keept beams at constant depth and vary the width instead. Surprised because depth obviously has a much greater impact on the moment of inertia of the crossection, so to compensate for the lesser depth it'd take a...
  16. mikhelson

    one-way slab

    SteelPE: thanks a lot.
  17. mikhelson

    Loading Behind Retaining Wall due to Existing Commercial Builds

    To recast your question slightly, you want to ensure that the pressure bulbs of the building and the retaining wall don't overlap. For that you'd need to estimate the width of the building's footings. For the case of shallow footings, the bulb of influence extends to about two-to-five times the...
  18. mikhelson

    How many beam sizes to use

    jike: I understand that we want to keep the depth of beams to a minimum. But once we agree on the depth of the deepest girder, is there any reason to keep the depth of other beams and girders same -- even though they could be more shallow? Thanks for your posts.
  19. mikhelson

    one-way slab

    Two questions about 1-way slabs. 1) When are 1-way slabs preferable to 2-way slabs? I can only think of the ease of design and perhaps the geometrical requirements of a particular project, i.e. column locations. 2) When calculating live load reduction based on floor (or flat roof) area, do...
  20. mikhelson

    How many beam sizes to use

    Several people mentioned the ideal of keeping the depth of all beams consistent. If ceiling tiles and mechanical conduits can be suspended at any height and apart from the cost of forming, exactly what are the advantages of same depth for all beams & girders? Thanks

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