Recent content by RonRoberts

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...

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...

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

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...

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.

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.

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

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

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...

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

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.

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

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...

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

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...