Following the collapse of the Hartford Arena roof, a computer model with correct buckling lengths and stiffnesses of all bars was "loaded" in steps. In terms of the load value on the roof of the day of failure being 100%, what conservative load value was calculated for the first bar to fail and what was the final load value for progressive collapse? Do you consider this gives the roof structure an acceptable margin of safety and give a justification to your answer (F & A)? 4

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