Collapse of the World Trade Center (WTC), New York, in

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Collapse of the World Trade Center (WTC), New York, in 2001, was due to

1. Wind load failure
2. Foundation failure
3. Thermal performance failure of reinforcement steel in RCC
4. Thermal performance failure of structural steel

Correct Option: D

Collapse of the World Trade Center (WTC), New York, in 2001, was due to thermal performance failure of structural steel. Structural steel failed at very high temperatures.