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Site fire from woodwork to steelwork-re use the steelwork?

Site fire from woodwork to steelwork-re use the steelwork?

Site fire from woodwork to steelwork-re use the steelwork?

My dear pals

This is an experience worth sharing and your point of view will be highly appreciated. Please allow me to post this one to Structural engineering as well

A steel structure about 2 story high is assembled, floors and wall not yet clad, so it is lightweight.

On the ground, a pile of steel beams and trusses are stored next to a freshly removed pile of wood formwork removed from concrete walls.

And the pile of wood, big enough catches fire with the following consequences:

a) The pile of stacked up steel beams get all the heat, a few bend, the paint removed in some portions, blackened in others. None is completely burnt and so there is curvature due to temperature differences

b) The erected steelwork close to the pile of wood gets blackened but no distortions or deflections observed.

My judgement says:

1) the steel is not over heated since the paint can resist up to 200degrees celsius prior to complete flaking.Here it is only blackened.

2)No remoulding happened because curvature of piled steelwork shows that the steel took an almost elastic shape.

3)The steel in some portion has hardened after uniform cooling in 20degree celsius air  due to close contact with  hot wood and air, but not to the extent that it can be brittle

So I can go on, correct the paint, the curvature with a little heat treatment and re-use my steel.

Talking about a remote area and engineering limits with all the rationality, and no life safety concerned-only material behavior under fire and after fire

Your discussion will be highly appreciated.


RE: Site fire from woodwork to steelwork-re use the steelwork?

IJR - usually, if the steel is not bent,then the steel wasn't heated to any significant degree and can be re-used.  

If it is bent/warped, then there are two concerns - if the members are in compression, localized buckling becomes an issue and trying to straighten the steel with more heat isn't always successful at getting the shape back to within tolerances.  And if there is any fatigue issue (crane loadings, seismic, etc.) the steel may be more brittle and thus pose a problem.

By the way, IJR - good to see you back on Eng-tips - seems like its been a while since I've seen you post.

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