Home Forums Hunting & Shooting Hunter's Campfire What caused this failure?

Here's my guess:

The ties (not tie wire) are on the outside of the longitudinal bars - that is good. The squares ties were probably fabbed as two "U" shaped pieces - this makes it at easier to tie up the rebar cage. The legs of these ties are overlapped, but must have the proper overlap length - e.g development length. If they don't have this, then the columns would burst into the "chinese lantern" that you see.

A good earthquake can do this kind of damage too.

When you gonna post the answer Cash?

That would be a Schmidt Hammer. Coring and testing is more accurate.

I'm thinking they poured a bad load of concrete. Either too wet, too old, contaminated with excess fly ash or flat out sent the wrong mix design.
If I was the concrete supplier I'd be schitting bricks. That is a very expensive repair.

Yep! Building chit under a structure sucks and is labor intensive.

How did you come by this knowledge perfesser? Are you a grain expert, or were you doing research on party boats for LBP?

TOKYO, Japan - Pieces of concrete have fallen off a pillar of an elevated tracks of the Joetsu Shinkansen Line on Oct. 25 following a series of earthquakes. Photo was provided by East Japan Railway Co. (Kyodo)

Schmidt... Swiss...

Same same.

Ever use one?

Five random samplings would tell a whole lot very quickly. Cores would of course be essential and the definitive "evidence" for the obvious lawsuit.


Of course Slenderness Ratio is a component of all column design. This column seems to have perfectly reasonable ratios IMHO.

The nature of the concrete "chunking" during the failure and the fact that the rebar is 100% clean at every location leads me to believe the water to cement ration was fugged... most probably a load was cooking off in the truck and they souped it and dumped it...

Lack of any visibly fractured course aggregate kinda reinforces all above to me.

Someone said too much fly ash... that is also a very possible culprit.

I 200% the pic...

Many times. I was in the concrete business for 40 plus years.

They are called stirrups and typically they will come as a full rectangle. The will overlap at one end.

24-36 bar diameters is a normal "overlap" or "splice"...

If #8 bar... the "overlap" or "splice" would be 24" - 36"

Earthquake damage. Now we know what went wrong.

Yes

Interesting...

I found the pic on the Web with no further information. PE group I follow some.

Seismic seems odd in that there is no visible damage to any of the other concrete work in the background.

Regardless... a fun little study.

https://www.[bleep].com/tokyo-japan-p...illar-of-an-elevated-image151019849.html

http://rftp.com/concrete-failure.html

Something heavy atop Probly added to the bulge effect

easy , .. it broke .. 😁

Or in other terms "it done come from together"

The wall in the background may not be a load bearing wall.

I knew it!

What kind of boat did he end up getting?

I concur, but seismic don't care.

Do I win something?

I just retired from the Alaska DOT as a Highway Engineer. Worked next to the bridge guys. When they went from ASD to LRFD they needed some full scale testing of columns to verify some stuff. I watched some of these tests and that's the kind of stuff you'd see. Of course, they don't test them to that level of failure.

Sure thing... I'll take you fishing next time you come to Virginia.

The company I was working for was called CHJ there were also several other company's working on it as well
Smith Emery and Twining
I had worked for both of them before I was told by George Batty 3rd (probably miss spelled his name) about what was going on in the Labs.

I was collecting the unshattered test cylinders and cutting the ends off of them to make a small retaining wall when I came across the Steel Needles in some of the cylinders.
I went into the lab and asked my supervisor what the samples were from.
He told me to go talk to George and I did.
George owned aporx. 5% of the company at that time.

He was a GREAT Teacher to us Concrete Inspectors.
I owe that guy a lot for what he taught all of us.

He sat me down and gave me some of his valuable time to explain what the Labs in the area were trying to accomplish.

He explained how several Labs were able to get consistent 30K psi in their mix designs but they could not break any higher on a consistent basis.

Those needles in the concrete were something like 120K tensile strength and the test cylinders were loaded with them.

My Supervisor told me that he was wondering when I was gunna ask about those Cylinders because I always asked a lot of questions to learn about stuff.
I got into Inspection as a Welder Fitter Shop Fab guy and Concrete Inspection came later.

I love what I do because there is always something that comes up that I have never seen and I get the personal guided tours into company's that do not allow anyone in.

I am getting driven out of the industry by book smart desk Inspectors that know very little about what they are inspecting.

Most of what I know for my job did not come from a book it came from personal experience of doing and seeing not reading.

Sad to watch an industry collapse around you as more and more stupid people get the jobs as a stepping stone carrier over the ones that actually know the job , Love the job and live the job.