21-10-2012, 01:25 AM
(This post was last modified: 21-10-2012, 01:44 AM by Jeffrey Orling.)
Not much available and it's very incomplete but try this:
81 columns above floor 7
45 below
How so? transfer trusses.
read about a tower where the engineers messed up and almost lost the building.
https://failures.wikispaces.com/Citicorp+Center
From that story which APPLIES to the WTC:
"While working on a new building design in the spring of 1978, LeMessurier planned once to again implement diagonals. During a meeting with the steel fabricator the question came up on the connections of these diagonals; field welded full-penetration welds are expensive. LeMessurier called his associate to confirm the success on the field-welded connections used on the Citicorp building and was told that the welded connections were replaced by bolted connections designed by Bethleham Steel for a savings to the bank of $250,000. This was common practice for steel erectors at the time and the new joint design was based on the loads provided by LeMessuriers' Cambridge office. There is a discrepancy in the account of events, whether or not LeMessurier was aware of the change from bolts to welds. McNamara claims LeMessurier knew of the switch to bolts, this statement has some credibility since LeMessurier's Cambridge office was the one that provided the design forces to Bethlehem Steel. "
and look who surfaces in this story as well:
"Leslie E. Robertson was brought in and became the bank's consultant on this matter."
How bout this:
"This knowledge, combined with LeMessurier's discovery that his firm had used New York City's truss safety factor of 1:1 instead of the column safety factor of 1:2, meant that the building was in critical danger. "
Trusses in NYC did not have to have reserve strength... FOS was 1.
"Because nothing happened as a result of the engineering gaffe, the crisis was kept hidden from the public for almost 20 years.."
Do you see a picture emerging of incompetence being covered and hidden from the public? When the WTC collapsed they DID have something happen and they DID have to HIDE IT FROM THE PUBLIC.
Calling NIST ...Calling NIST...your skills and expertise are required in this time of national crisis to assure the public that it was the crazy terrorists who managed to know those towers down..
81 columns above floor 7
45 below
How so? transfer trusses.
read about a tower where the engineers messed up and almost lost the building.
https://failures.wikispaces.com/Citicorp+Center
From that story which APPLIES to the WTC:
"While working on a new building design in the spring of 1978, LeMessurier planned once to again implement diagonals. During a meeting with the steel fabricator the question came up on the connections of these diagonals; field welded full-penetration welds are expensive. LeMessurier called his associate to confirm the success on the field-welded connections used on the Citicorp building and was told that the welded connections were replaced by bolted connections designed by Bethleham Steel for a savings to the bank of $250,000. This was common practice for steel erectors at the time and the new joint design was based on the loads provided by LeMessuriers' Cambridge office. There is a discrepancy in the account of events, whether or not LeMessurier was aware of the change from bolts to welds. McNamara claims LeMessurier knew of the switch to bolts, this statement has some credibility since LeMessurier's Cambridge office was the one that provided the design forces to Bethlehem Steel. "
and look who surfaces in this story as well:
"Leslie E. Robertson was brought in and became the bank's consultant on this matter."
How bout this:
"This knowledge, combined with LeMessurier's discovery that his firm had used New York City's truss safety factor of 1:1 instead of the column safety factor of 1:2, meant that the building was in critical danger. "
Trusses in NYC did not have to have reserve strength... FOS was 1.
"Because nothing happened as a result of the engineering gaffe, the crisis was kept hidden from the public for almost 20 years.."
Do you see a picture emerging of incompetence being covered and hidden from the public? When the WTC collapsed they DID have something happen and they DID have to HIDE IT FROM THE PUBLIC.
Calling NIST ...Calling NIST...your skills and expertise are required in this time of national crisis to assure the public that it was the crazy terrorists who managed to know those towers down..