WTC [WAS] Do you have predictions about 2017?

[grarpamp]

Mechanical properties of structural steels at elevated temperatures
and after cooling down (2006)
http://www.civil.canterbury.ac.nz/sif/documents/paper19.pdf

Fire safety design of building structures has received greater
attention in recent times due to continuing losses of properties and
lives in fires. However, the structural behaviour of thin-walled
cold-formed steel columns under fire conditions is not well understood
despite the increasing use of light gauge steels in building
construction. Cold-formed steel columns are often subject to local
buckling effects. Therefore a series of laboratory tests of lipped and
unlipped channel columns made of varying steel thicknesses and grades
was undertaken at uniform elevated temperatures up to 700°C under
steady state conditions. Finite element models of the tested columns
were also developed, and their elastic buckling and nonlinear analysis
results were compared with test results at elevated temperatures.
Effects of the degradation of mechanical properties of steel with
temperature were included in the finite element analyses. The use of
accurately measured yield stress, elasticity modulus and stress-strain
curves at elevated temperatures provided a good comparison of the
ultimate loads and load-deflection curves from tests and finite
element analyses. The commonly used effective width design rules and
the direct strength method at ambient temperature were then used to
predict the ultimate loads at elevated temperatures by using the
reduced mechanical properties. By comparing these predicted ultimate
loads with those from tests and finite element analyses, the accuracy

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