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La mienne (copiée d’un autre commentaire) : Failure Consequences and Reliability Acceptance Criteria for Exceptional Building Structures avec ce passage :

For scenarios Safety 10 and Safety 30. the cheapest solution is ensured by the Cushioning Structure with 10 and 71 million USD, this again because the cushioning columns are inserted only in the 12 respectively 32 upper stories of the building. For scenario Safety 50, the Steel Structure yields the minimum costs because, compared to the other structures, the loss of floor space is significantly lower.

In comparison, the cost of the two WTC towers (construction period 1966-1977) was 900 million USD (169]. Today they would cost 4.7 billion USD, or 2.35 billion USD per tower, see Annex B.

Major benefits of the concrete walls and partially of the composite elements arc a higher fire resistance and a higher resistance against initial damage due to accidental action (sec Table 4.4).