Expertii americani in constructii civile au explicat ieri cauzele care au dus la prabusirea celor doua turnuri ale World Trade Center. Structura de otel a cladirilor s-a topit pur si simplu din cauza incendiului din interior.
„In rezervoarele avioanelor se aflau tone de kerosen. Acestea au luat foc in momentul impactului. In doar cateva minute, temperatura in zona incendiului a depasit 1.500Âş C, limita maxima de rezistenta a otelului folosit la constructie. Acesta s-a topit si a curs spre etajele inferioare, asemenea lavei unui vulcan, topind totul in jur. In cateva minute, greutatea exercitata intr-un singur loc asupra structurii cladirii a devenit prea mare pentru a mai putea fi sustinuta. Etajele au cazut din unul in altul. Primul turn s-a prabusit mai repede pentru ca avionul l-a lovit mai jos, greutatea exercitata asupra partii inferioare fiind imensa”, a declarat un expert.
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