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  1. weab

    Sewage Specific Gravity

    Thanks everyone. This helps as this is what I thought. My engineer has used a specific gravity of 1.8, which is obviously way too high. 1503-44 & bimr - Yes, there is little chance for any significant concentration, but maybe just a little. A worker flushes or washes hands, it goes to a...
  2. weab

    Sewage Specific Gravity

    Hello, I am a structural engineer trying to design a sewage holding tank in a seismic zone. I'd like to know the specific gravity of typical of the combined fluid with solids, not just the solids. This fluid would be pumped into a tank just outside the restroom of an underground mine. This...
  3. weab

    Is geotech report Spectral Acceleration the same as IBC value Sa?

    Hello, I am not certain if this is best in this structural forum, seismic formum, or geotech forum, so I apologize in advance for this placement. I am trying to interpret a geotechnical report from a few years ago at a mine site in SE Asia. We are designing using IBC and ASCE 7 codes. This...
  4. weab

    RISA 3d v 18 - New format

    I am using v18.0. I want to rotate the view 90 degrees, not the actual model. Dumb question: I didn't see this addressed above. For some reason my colleagues and I cannot find a way to rotate the view 90 degrees to match the view on our drawings. There appears to be no button in the ribbon...
  5. weab

    Whitmore section (gusset plate design)

    I believe that you still find the appropriate Whitmore section at the point where the gusset meets the supporting steel. In this case, your section is only as wide as your gusset. The Whitmore section tells you the maximum width you can consider. You just can't take advantage of that because...
  6. weab

    Tension Rod Connection to Central Ring

    Also, how will you tighten the nuts? I assume that you will need to either install rods in the pipe then tighten the other ends of the rods, or you would use washers with a rounded side and a flat side. Just curving the washers don't provide for a good bearing surface though nuts are very...
  7. weab

    Tension Rod Connection to Central Ring

    The first thing that comes to mind is to use Roark's Formulas for Stress and Strain which has stresses on rings. It works best when the loads are at 90 or 180 degrees to each other. It is easy to use superposition for multiple loads, in this case 3 loads. Since this is not exactly the case...
  8. weab

    weld symbols

    I'm guessing that Dik is an older codger like me. Once upon a time, AWS would allow a double fillet call out with the bottom (near) only size callout which would be understood to be the same on both sides. Both sides would only be called out if they were not the same. Somewhere along the way...
  9. weab

    HSS Corner Weld Detail

    Like Thai says, option B takes double loads, but I'd say so does option A. That one weld should be analyzed to do double duty. I think the load in option B still goes where you think it does. I generally prefer the more direct load path of option A. I don't like welding on top of another weld...
  10. weab

    Cantilevering Structural Grating

    I cantilever grating all the time. If using 1 1/4" grating and 50 psf (or even 100 psf), 8" should be fine. Of course, you know that the orientation must be just as you have it shown. If you find the loading table for this grating, you could back into the stress in this case. If grating...
  11. weab

    Sag Rods vs Lateral torsional buckling in perlins ?

    Agree with BA. I could only begin to consider this as effective if the sag rod is placed within the top quarter of the member section. Even if I convinced myself of this, it would only be for top flange. Even then, this would only apply if sag rods are placed on both sides of flange assuming...
  12. weab

    FR Moment Connection Question

    I'm not at the office right now. However, make sure that you read the code commentary for the shear lag and fully restrained connection sections. I believe that they address most of your concerns.
  13. weab

    stair Design

    Perhaps 300 lb is your requirement. Know that current OSHA requires 1000 lb. If OSHA must be met on your project, then check out OSHA 1910.
  14. weab

    Repair to Monorail Beam

    I say go with it. I'd use full pen welds ground smooth everywhere.
  15. weab

    Generic questions regarding SE exam

    MrH, Congratulations and great input! Your philosophy sounds similar enough to mine so I'll stick with my procedure. Regrettably, I needed to make a decision to apply to NCEES by tomorrow. I feel that if I had started studying one month earlier - 5 months total studying like you - that I...
  16. weab

    Generic questions regarding SE exam

    I didn't realize that Georgia is like that. I've never heard that you could not merely take the PE in Georgia. I've been studying since just after Christmas. I am putting in about 3-4 hrs per day, 3 days a week - about 10 hours total. I've made the decision that I started too late as I don't...
  17. weab

    Slip critical connection at anchor rods

    Do I understand correctly that only the length of rod between the nut an leveling nut will see pretension? If so, then I don't agree that the anchor rods can take the fatigue load. Leveling nuts are not recommended beneath structures subject to fatigue. You can get a failure in the rod...
  18. weab

    Single-sided max fillet weld size

    If the weld is not strong enough, you need a bevel weld - CJP.
  19. weab

    Model Tapered Members

    Not at the office so I can't review your model, but it sounds clear. Who cares if the the TOS is kept constant if RISA doesn't understand the reality. Is the bottom of steel constant? No, so why is that more realistic? What is realistic is that you have a tapered section in which the center...
  20. weab

    Double Web Plate Girders

    You could try using a tube shape. The flanges and webs create a tube but the flanges stick out beyond the webs. I'm not at the office as I write this so if you use a user defined tube, you MIGHT be able to define different wall thicknesses. If so, the top and bottom could be thick enough to...

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