Grad Manual PDF 23

I have a few FAQ’s under a graduate manual. I am unable to post tables and pictures in the FAQ's, thus I am posting the PDF here, as a back link. This manual is given to graduates in my firm with a copy of Structural engineer's pocket book By Fiona Cobb. Please feel free to read and if you do, please make suggestions, or more importantly point out my errors and omissions. This is a live document.

I can guarantee that there are a few errors in the document. Accordingly keep in mind that this paper is only meant to make graduates think, not to solve problems, and should never be used as a reference or similar.


Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

 

[slickdeals]

And the link to the free-fall article I mentioned before

http://www.buildblock.com/pdfFiles/Concrete Free Fall article (3).pdf

 

[BAretired]

Good references, slickdeals. This is very useful to know.

BA

 

[rowingengineer]

slickdeals,
Good references however I will point out that these fall heights have been developed from testing without large amounts of reinforcing present, such that should only be applicable to massive structures or drilled caissons.

Asixth,
The limit is something I have picked up along the way, I will try and find a reference however.

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

 

[hokie66]

Bored piers are not highly stressed, so some loss of strength is generally acceptable. As long as the concrete is consolidated, I don't worry about a bit of segregation.

 

[rowingengineer]

Hokie,
I agree and I shall make the note in the manual clearer.

Asixth,
This is the best I could do, sorry. Page 22

http://www.concrete.net.au/publications/pdf/concretebasics.pdf

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

 

[asixth]

Be careful how you word it in your manual, you don't want your graduates to think it's acceptable to pour concrete from 1.5 meters into a pier because a loss of strength from segregation will not be critical to the design. The quality of construction practices are on the slide backwards as it is, we should be trying to do everything we can to ensure best practice is taken. Bad construction practices shouldn't be engineered for because it is an "easy" way to do it on site.

 

[bridgebuster]

The 5'/1.5 M free-fall limitation is common in many DOT specs for walls, footings, and slabs.

 

[chazcy]

Pls include the procedures with an example in modeling, analize and design of concrete building using software like ETABS,SAP,Staad.Pro etc.

Thanks,
Chaz

 

[dhengr]

rowingengineer & asixth:

Very nice work. A real addition to the knowledge base on this forum. That’s a ton of knowledge and experience in mighty fine packages. It should be required reading by all structural engineers practicing today. And, rather than commenting on your publishing or indexing prowess, we should be grateful for the free gifts; and willing to add to them, if you two will be so kind as to continue your compilations.

 

[rowingengineer]

Asixth,
how does this sound?

2.If placing concrete directly from a truck or concrete pump, place concrete vertically into the face of concrete
already in place. Never allow the concrete to fall more than 1 to 1.5 meters, unless you are dealing with massive concrete structures or drilled caissons/pier. For these situations best to talk with the senior structural engineer.

Chaz,
Sorry going to have to say no to this one, for two reasons, 1. I don't use ETABS,SAP,Staad.Pro etc, I use RAPT (on big projects combined with Strand 7 or R/C building), which uses the strip theory, nicely covered by a few books. 2. I don't let my grads near Finite element program until they know the basic's, They are only allowed to use RAPT for checking for the first 6-12 months. I am however writing an FEA paper.

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

 

[rowingengineer]

Here is Mark 2, I have added a contents page and page numbers. To make it easy for people to FIND & REFERENCE the mistakes or omissions.

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

 

[slickdeals]

Volume = L x B x thickness
27 cu. ft = 1 cu. yd

We are Virginia Tech
Go HOKIES