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Re: [Fwd: Really Questioning 9-11 [Book]]

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Dave,
For structural purposes we don't use carbon steel beyond 800 degrees in normal applications (i.e. ducting in power plants). Fires are extreme situations. The temperatures reached in galvanizing are sufficient to cause deformations in steel. Often, steel has to be cold straightened after it is galvanized.

Regards,
Harold Sprague




From: Gale45man <gale45man(--nospam--at)yahoo.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: Re: [Fwd: Really Questioning 9-11 [Book]]
Date: Fri, 18 Mar 2005 14:43:47 -0800 (PST)

If it is true that "At 800 degrees, steel loses most
tensile strength" then the galvanizers should be
pulling pretzels out of their vats (pure zinc melts at
850 deg F).  Did you mean 1800 deg F (not 800 deg F)?

Here are some excerpts from the AISC FAQ...

The strength of steel remains essentially unchanged
until about 600°F. The steel retains about 50% of its
strength at 1100°F. The steel loses all of its
capacity when it melts at about 2700°F. However, for
design purposes, it is usually assumed that all
capacity is lost at about 2200°F.


The duration and the maximum temperature of a fire in
a building compartment depends on several factors
including the amount and configuration of available
combustibles, ventilation conditions, properties of
the compartment enclosure, weather conditions, etc. In
common circumstances, the maximum temperature of a
fully developed building fire will rarely exceed
1800°F. The average gas temperature in a fully
developed fire is not likely to reach 1500°F.
Temperatures of fires that have not developed to
post-flashover stage will not exceed 1000°F.

d a v e   e v a n s


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