Mechanical properties of steel structure

Mechanical properties of the steel were determined using tests at room temperature, high temperature, and at high strain rates. In addition, the structural steel literature and producer documents were used to establish a statistical basis for the variability expected in steel properties and for modeling steel properties as a function of temperature and strain rate for insertion into building performance models. A total of 32 distinct steels were modeled in this manner.

A comparison of mechanical properties with relevant specifications and properties required by the design documents is included. The steel used in the construction generally met the expectations of the designers and the specifications called for in the steel contracts.

The yield strengths of the perimeter column steels generally exceeded their specified minimums by 10 percent to 15 percent. The number of occurrences of plates with tensile properties at or slightly below the specified minimum is consistent with the historical variability of steel strength.

Yield strengths of undamaged steels in the rolled core columns, however, were lower than the historical literature indicates as typical. The strength of the steel in the floor trusses was higher than called for in the original specifications.

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