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Thanks I will go back and read up on the brittle failure issues for the two slabs (12'x40' and 12'x20') slab.

Thanks for the clarity TXStructural & hokie66. For the purpose of calculation on the suspended slab, should the central rebar be ignored as part of the calculations?

per DCID 1/21 (http://www.fas.org/irp/offdocs/dcid1-21.pdf) 4.1.1 Reinforced Concrete Construction: Walls, floor, and ceiling will be a minimum thickness of eight inches of reinforced concrete. The concrete mixture will have a comprehensive strength rating of at least 2,500 psi. Reinforcing...

So the round would add strength along its length primarily but not against twisting and deflection?

here is a pichttp://client.pdinc.us/2011-10-10_00-34-11_520.jpg

3" weld every 9" alternating top and side flange. angle iron, round stock and welds appear to be in good condition. angle iron is 4"x6"x3/8" round stock is about 1" dia

How does adding the round stock on the inside corner add (significant) strength? ----- |O | | ?

Why would a piece of round stock be welded to the inside corner of angle Iron? I have been observing a truss framed roof from 1921. The angle irons on the upper parts of the trusses have a round stock of a diameter approximately 1/3 the flange width. What could the reason be for the round stock?

I am going to reject the proposal for CMU underpinning. Thanks everyone for the advice and critical thinking. In regards to the space for the vault, we are short by 13 inches to meet the "minimum" design and have the space functional. We are asking for permission to modify the specs from the...

[tab]>In my opinion, Using reinforced CMU blocks is a very unusual way to underpin a building. That was my reaction as well. 35 cubic yards of concrete vs. 1050 blocks is the same price. Then you have mortar, grout and rebar. [tab]> 9' is relatively deep, unsafe, and illegal unless you shore...

To Mr. Peirce, When you said “Never saw that done and I've done hundreds of underpinning projects.”, did you mean that as it should never be done for reasons x, y, & z? Or more of I have never seen it and have no basis to evaluate it?

My apologies for not providing enough information, I will try to supplement what was missing. The depth is approximately 9’. Shoring is to be used in the excavated areas. The excavation is interior for a vault installation. The existing foundation is laterally supported temporarily against the...

Our underpinning foundation subcontractor is advocating use of 12" block as the underpinning material (dry packed at the top 2”). Are there any opinions, questions or observations from experience contractors that I should address with the sub? Background: The underpinning is to be continuous...

I think I am going to spend less than $100 in tools on this one. I like that there are other ways of doing it, but for me (I am an electrical engineer) they are more "complicated". Thanks for everyone’s help on this.

Then this http://www.grainger.com/Grainger/items/5DPJ8?cm_mmc=Google%20Base-_-Test%20Instruments-_-Soil%20Testing-_-5DPJ8 and its adapter foot should do the trick. This does beg the question why use a dial penetrometer (600$) or a cone penetometer (1300$) or even a dual mass dynamic...

Can someone recommend a penetrometer for a one time use? I found one for 60$ at Amazon.com.

What are the tests performed on the soil prior to an under pinning planning and prior to start of construction? What observations / tests about ground water are performed? Are there any other check list items?

I also found: Modern Underpinning - Development, Methods And Typical Examples by Lazarus White 2008 I am goin to read that one too.

Just want to make sure, I can only find used copies, and they start at $400 Foundation Engineering Handbook Hardcover: 923 pages Publisher: Van Nostrand Reinhold; 2nd edition (December 1990) Language: English ISBN-10: 0442224877

I moved the books sub topic to a new thread (here)