I have designed foundations for a handful of PEMB projects. I have not considered the continuous footings adjacent to the spread footing in resisting sliding, but I agree there is some legitimate amount of contribution. Determining a reasonable limit on the effective length of footing is a...
OP: Agree, checking shop drawings can be somewhat boring, but it is very important as clearly explained above. In going from school to work you may have been caught off guard by the shop drawing review portion of the job. Not every aspect of working in an office is previewed by a course at...
The change in elevation shown in Option 1 is too large for a single step. Step the foundation down using two or three steps along the length of the wall.
In your second photo, there is a thin horizontal white band between the glass blocks and the top of the window frame. What is that? Perhaps it is a steel plate with hangers placed between the glass blocks?
Use a concrete pad for equipment anchorage. Anchors can be set in fresh concrete of pad using a template. Tie the concrete pad to the slab with reinforcing steel. Akin to using a conc pedestal between a footing and a steel column base plate. Also to accommodate long anchor rods a concrete...
I would prefer the software product. However for transparency I prefer Mathcad worksheets that I write myself. I've also done a handful of decent C (not C++) programs for more complex problems.
I've never understood why someone who is capable of writing wiz-bang Visual Basic code (btw I'm not)...
I agree with XR250. I provide one layer of building paper (30 lb roofing felt) on vertical surface (face of wall, etc) as a bond breaker. I have seen a slab stick to the wall (over about a 3 ft length) and cause a shrinkage crack (also 3 ft long) parallel to the wall about 1 ft out from the...
I designed a number of post-tensioned buildings in the early 2000s. Design process for all of them was exactly as KootK described above. Post-tensioning is alive and well in the Mid-Atlantic US.
The mention of bushings made me think of something: perhaps the lug can be wrapped in thermal break material, 4 sides + bottom? Just throwing it out there
Many of us have received this over-design rant from an owner or contractor at one time or another. I find they're usually leaving a piece of the design out in their comparisons.
Examples:
Owner: "My last building having the same spans used only a 7 in. slab, yours is way too thick at 8 in." ...
Something to consider:
Is there a rational analysis method you can use to show the tension in the bottom flange flows around the notch, up through the stiffeners, etc. This type of solution would come in handy for many retrofit situations and I would be interested to know how the stresses can...
I will respond with reference to below-grade concrete tanks only. Steel, masonry, timber may have special situations to which my comments don't apply.
I may not say every view must show every dimension, but generally, I agree with your peer.
The minimalist dimensioning practice you refer to...
Thanks for your responses. The last version I used was Mathcad 7. It's been a while but I remember it as a good program so I wanted to get back into it. From what I've read, I think MP3 will do most of what I need. I was going to start with MP3 rather than M15 for the reason rmix22 mentioned...
Thanks rmix, that's very helpful - I am planning to install on a laptop and have been getting mixed messages from around the internet. I would be interested in hearing others' success/short-coming with Widows 8 and Mathcad 3.
I would look into a ring foundation or ringwall. This is a concrete ring following the circumference of the tank or bin shell. This could be ideal for your situation since you have to go so deep anyway.
