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Originally posted by Seymour Butz
...He's looked at Greening and Bazant's papers, and the NIST, and agrees with what they say. He's also read Gage's paper and laughed.
Originally posted by ANOK
If he came to that conclusion after reading the NIST report then he either didn't really read it, or he didn't understand it.
The NIST report does not explain how the towers globally collapsed, they only explained the initiation of the collapses, and even then they made some really wild assumptions to fit their preconceived conclusions.
Why didn't they explain the collapses after the initiation? Because they couldn't, so they made up the idea that global collapse was inevitable once initiated. If you know anything about physics and construction you would be questioning the missing information, and how they came up with the claim of inevitable collapse.
There is no precedence for global collapse of steel buildings from a-symmetrical damage and sporadic office fires, that burned for no more than an hour. The process of global collapse could also not be repeated in a lab. So where could the claim of inevitable collapse come from? Nowhere, it was made up to fool those that don't understand, or don't want to understand why global collapse from fires and asymmetrical damage is highly unlikely, if not impossible.
You can't make a claim like that without a precedence to back it up.
It's never happened before, no precedence, and yet it happened to 3 buildings on the same day... Now that is impossible.
Talk about being blinded by science, or better yet blinded by bullcrap.
Originally posted by jackinthebox
reply to post by ANOK
Nice post shutting down the delusional and leaving them speechless, once again.
Star for you.
Partial Penetration Weld
A partial (half) penetration butt weld connecting two of the
largest heavy jumbo steel sections available has been tested.
The final capacity of the splice exceeded by more than 25%
the predicted capacity based on the effective dimensions of
Fig. 25. Ductility definitions used.
the smaller member joined. The smooth transition between
the smaller and larger sections at the splice created an
enlarged weld surface which may be in part responsible for
the increased strength. Nonetheless, simple design
calculations are deficient in predicting the state of stress of
the critical section. The implications of this for other weld
configurations must be carefully assessed.
The splice failed in a very brittle manner when tested
under pure bending. Numerous factors, as outlined earlier,
contributed to produce the observed brittle behavior. The
effect of axial loads on this splice has been analytically
simulated in Ref. 7.
It is not known at this stage if all partial penetration butt
welds will behave similarly irrespective of the welded
specimen thickness or the degree of penetration. This test and
previous research on Group 4 and 5 steel sections (as well as
simple fracture theory) implies that the risk of brittle failure
is increased with large steel thicknesses.
This observed brittle behavior creates a risk of particular
interest in seismic regions where it is recognized that
codecalculated forces may be largely exceeded by actual
earthquake-induced actions. These considerations have been
further discussed by the authors elsewhere.7 Nevertheless,
designers should be aware of the potential adverse behavior
of this detail and use it in circumstances only where it will
not be a structural weak link.
Originally posted by Seymour Butz
No, I could list the errors/fallacies in his post if I wanted to.
But what's the point?
Welding is the most common way of permanently joining metal parts. In this process, heat is applied to metal pieces, melting and fusing them to form a permanent bond. Because of its strength, welding is used in shipbuilding, automobile manufacturing and repair, aerospace applications, and thousands of other manufacturing activities. Welding also is used to join beams when constructing buildings, bridges, and other structures and to join pipes in pipelines, power plants, and refineries.
Originally posted by Griff
Reply to Seymour Butz and Gottago.
I'll go cook up my crow now.
Originally posted by IvanZana
This year I think there is going to be some disclosure.
Originally posted by Pilgrum
Here's a classic example of broken welds, also shows just how deep the welds were in relation to the steel thickness. I don't think it's it's a coincidence that the sections came down in approx 30' lengths as that's exactly how the core was was originally assembled.
Originally posted by Seymour Butz
Have you ever considered writing up a white paper about these issues?
Originally posted by Pilgrum
I don't think it's it's a coincidence that the sections came down in approx 30' lengths as that's exactly how the core was was originally assembled.
Originally posted by Pilgrum
I'm looking at the very ends of those 2 identical columns where the remains of the weld can be clearly seen penetrating unevenly into the joint to an average depth of about 1/3 of the column thickness. The welds have fractured with no deformation of the columns.
I can't imply that the welding was shoddy or that it didn't meet or exceed the design specs for strength. It's just an indication of where the weakest points were in the columns, not that they were weak and they did break under extraordinary stress.