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  1. RonRoberts

    Clarifier Topping Slab

    Venting the source would be good but the source appears to be groundwater that has dissolved gases in it that come out of solution, slowly, very slowly over time in the irregular volume below the clarifier slab. There are probably multiple little pockets of gas, that aren't connected to each...
  2. RonRoberts

    Clarifier Topping Slab

    Dik. Best that I've been able to figure is there is an old contaminated site uphill from this site (supposedly being remediated) and a combination of nasty chemicals appear to be entering the ground water and moving toward this site. The bottom of the clarifier is almost a dome (thickened...
  3. RonRoberts

    Clarifier Topping Slab

    JedClampett....yep, it pushed the topping slab up into "bubbles" I've attached a video where we poked a hole in one. https://files.engineering.com/getfile.aspx?folder=e9e10d61-c5c7-4c7c-a5f2-e3f66e0d2cb0&file=IMG_2522.3gp
  4. RonRoberts

    Clarifier Topping Slab

    I have a project where the existing clarifier topping slab is being pushed up by a mix of gases that get trapped. The underside of the pile supported clarifier is somewhat dome shaped and gases are coming out of solution in that dome below and are under pressure due to the high ground water...
  5. RonRoberts

    Snug Tight Connections - specifiy a torque?

    Snug tight is defined in AISC Section J3, 1 as being the tightness attained by a few impacts of an impact wrench or the full effort of a worker with an ordinary spud wrench that brings the connected plies into firm contact.
  6. RonRoberts

    Seismic Rehabilitation Cost Estimator (SRCE)

    Does anyone know if the FEMA Seismic Rehabilitation Cost Estimator (SRCE)is up and running any more? The current FEMA site has some files you can download but I can't find the online calculator. It seems to have vanished in Jan 2013.
  7. RonRoberts

    Calculating Tension and Sag in a Cable

    Josh, are you hinting that cable members are going to arrive soon????
  8. RonRoberts

    Help with ODESolve

    Regarding my first post on the ODESolve. I figured out how to solve the problem with "Given" and "Find".
  9. RonRoberts

    Help with ODESolve

    I'm trying to learn how to use MathCad's ODESolve function but I find my self stuck in very short order and MathCad's help doesn't seem to clarify things much. In the sample problem I have attached I get a message that the Variable is Undefined in the ODESolve statement. I think I followed the...
  10. RonRoberts

    help identifying an irregular OWSJ chord

    Looks like Macomber. Visit the slideruleera.net site. I think you'll find what you are looking for at: http://www.slideruleera.net/contributions.html
  11. RonRoberts

    How to handle uncomfortable technical disagreement/concern over design

    I'd review ACI 12.15.6 -splices in tension ties. I think the drilled pier with a net uplift of 2000 kips meets the characteristics of a tension tie member as described in R12.15.6. I wouldn't rely on a lap splice to transmit the load from the anchor rods to the drilled shaft.
  12. RonRoberts

    Single Span Bridge - Noobie Question

    Maybe a stage truss would work for you. There are several different manufacturers. I added a link for one of them. Ronhttp://www.tomcatglobal.com/pdf/heavy_plated.pdf
  13. RonRoberts

    Relating Seismic Design Values to the Richter Scale

    Take a look at: Boore, D. M., W. B. Joyner, and T. E. Fumal (1993). Estimation of Response Spectra and Peak Accelerations from Western North American Earthquakes: An Interim Report, U.S. Geological Survey Open-File Report 93-509, 72 pp. and subsequent work/comments by Boore in: Seismological...
  14. RonRoberts

    Concrete mix

    How big are your structures? Might want to read this paper about domes...
  15. RonRoberts

    Concrete thickness versus load

    Here's a guide that will help. You really need soils, slab reinformcement, and wheel load information, but if you work through Chapter 5 it will get you a good idea of the size of forklift you can operate on the floor slab. http://www.wbdg.org/ccb/DOD/UFC/ufc_3_320_06a.pdf...
  16. RonRoberts

    Top Chord Stability of Pony Truss Bridge

    Thanks! Ron
  17. RonRoberts

    Top Chord Stability of Pony Truss Bridge

    Anyone have a copy of "The Continuous Beam-Column on Elastic Supports" by E. C. Holt that they can post? Thanks Ron
  18. RonRoberts

    Enercalc

    It still has bugs that cause it to crash on some machines. I'm hopeful that they will get it fixed because it looks like it will be a pretty comprehensive tool but right now I'm still somewhat disappointed. When I get a solution out of it (if I turn off the graphics capabilities I get it to...
  19. RonRoberts

    Timber column repair with epoxy

    I've had good luck using products from the Rot Doctor in Seattle. http://www.rotdoctor.com/ And Borate products like Impel Rods. http://www.rotdoctor.com/
  20. RonRoberts

    steel supported by wood

    Used to be that UBC did not allow wood to be used to support concrete or masonry (with a few exceptions like floor toppings, see UBC 94, 2316.1). Don't remember any code prohibitions regarding timber supporting steel framing. IBC has different provisions for long term loading of timber with...

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