Peter Fairbrother <peter@tsto.co.uk> wrote:
WTC was rated for 3 hours major fire resistance.
On 2018-09-23 04:50, juan wrote:
OK - So you don't have any reference for the claim
I just gave you a reference to the claim. Nist cites pre 9/11 building codes and pre 9/11 work orders. https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=861610 "For this construction category, columns were required to have a 2 h rating as established by the Standard Fire Test (ASTM E 119); beams were required to have a 1½ h rating. The instructions to the bidders for the WTC 7 job were to bid on a 3 h rating for the columns and a 2 h rating for the metal deck and floor support steel, which corresponded to the more stringent fire resistance requirements for Type 1B (unsprinklered) construction." If you say they are making stuff up post 9/11, it is your job to produce some inconsistent pre 9/11 building codes and pre 9/11 work orders.