Why did you tell me this story now?
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This is not a recent case of collapse; however it is relevant because it involved a very large structure for which state of the art techniques were used and yet collapse could not be prevented. This story illustrates several aspects of collapse investigation:
First, a large construction, which was apparently designed according to state of the art recommendations, failed a few months after completion. No significant material degradation occurred in this case, but wind loads were underestimated by the designers.
Second, this case was reported using hypothesis proof methodology. It illustrates the kind of hypothesis considered by the Committee of Inquiry, and summarized how they were discarded or considered based on the available evidence.