UcfSE
Thanks for the advice.
Yes, it looks like I'll have to use Chapter 5, the working stress design methodology. I was trying to simplify the design by using Chapter 9, empirical design.
I'm designing an elevator shaft from 8" CMU which will be 32' high and 20' at its greatest width...
Would you consider a bond beam to meet
the criteria for use as lateral support for a CMU wall as prescribed in ACI 530, 9.5.2 ??
We have 15' between floors and h/t>18 for an 8" block wall. Increasing the wall thickness is not an option.
n1cq
CA Oranger,
I think all small practioners have learned this lesson the hard way - you don't learn how to deal with this in college!
Clearly, the architect/client are trying to diminish the vlaue of your work by using the classic "project delay" argument.
Here are the possible scenarios:
1...
CA Oranger,
I think all small practioners have learned this lesson the hard way - you don't learn how to deal with this in college!
Clearly, the architect/client are trying to diminish the vlaue of your work by using the classic "project delay" argument.
Here are the possible scenarios:
1...
Note to dirtsqueezer
Sound that if you're in the North, frost action may be causing this de-compaction effect.
The agronomy people appreciate the effect - it naturally loosens and aerefies the soils. Of course, it also pushes rocks upward - thats a phenomenon in itself.
n1cq
I'd use a version of hydraulic orifice flow.
I've done this before myself - written a small excel program to look a various cases.
You can find discussion on such in any undergraduate fluid mechanics text.
n1cq
Thank IHA,
Good observation.
Yes, the presence of sand/gravel in the groove will be a key indicator of at least one a "lift/drop" sequence.
The weight of the tank top including the anti-buoyancy slab is 18,000 lbs - quite a bit. I don't think a plate rupture would neccessily occur and the...
Thanks for the input CarlB.
Actually this is a rather interesting heat transfer problem.
The boundary conditions are as follows:
Ground surface - say 0 f
Tank wall perpendicular to grade - 32f+
infinite depth - 50f
The tank has a 12" anti-buoyancy slab cast atop it and 12" earth over the...
I have found a contractor with an interesting theory about frost heaving.
The scenario concerns a "monolithic" 2000 gallon concrete "tight tank" which is actually a precast "box" with an 8" thick h-20 rated lid which fits into the typical set of grooves one finds on standard "split" tanks. The...
The retention pond requires knowledge of the soil permeability expected (long-term) in the basin. Leaf debris, ect. can greatly reduce perms over the years, so be conservative in your choice. I've written some computer modeling programs in excel to provide a stepwise simulation for various...
