C7 said:
Specifically, what is the evidence that fire caused the implosion of WTC ?
If you keep missing and dismissing
When i ask for specific evidence that fires caused the implosion of WTC 7, i get non answers.
That is because there is no such evidence, only
speculation by the people at NIST.
[emphasis mine]
L.3.2 Collapse Initiation Scenarios
For the collapse to have started, there must have been a component or group of components that failed first, referred to here as the
initiating event, as shown in Fig. L–36.
I1.2 Initiating Components Fail Due to Fire Effects:
The
initiating event may have been caused by fire effects on structural components.
I2.3 Components on Floors With Burned Out Fires:
If the initiating components failed from fire effects, then locations where fires had burned out by mid afternoon
could possibly been affected by the cooling which occurs after a fire.
I3.4 Floor Systems Fail:
The cooling that
may have occurred as the fires burned out in an area may have generated thermal contraction forces, which
may have induced tensile forces at floor-to-column connections.
I4.2 Unbraced Columns:
If floor systems failed, one or more columns
may have lost lateral bracing.
I2.4 Components on Floors With Fire:
If the initiating components failed because of fire effects, .....
I3.5 Floor System Failure:
The fires
could have caused the failure of portions of one or more floor system and its framing connections.
I4.3 Unbraced Columns:
If floor systems failed, one or more columns
may have lost lateral bracing.
I3.6 Columns, Transfer Girders or Transfer Trusses Fail:
The fires
could have failed interior columns, transfer girders, transfer trusses, or their framing connections.
I4.4 Lateral Displacements:
Fire effects
may have caused column instability
I4.5 Temperature Gradients:
Fire effects
may have caused the failure of columns
I4.6 Uniform High Temperatures:
If initiating event components were sufficiently exposed to fire effects to be uniformly heated to elevated temperatures,