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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: neolib who wrote (175226)	11/17/2005 10:26:37 PM
From: Orcastraiter	Read Replies (3) \| Respond to of 281500

It's true that steel can lose strength when heated above 800 degrees. At temperatures between 300 and 700, yield strength ratios can be more than unity. At 800 degrees yield strength ratios are approximately 0.77. At 1000 degrees yield strength ratios are down to 0.63. I'm not sure how temperature affects ultimate strength characteristics. AISC says that steel construction is considered fire resistant without any insulation if average temperatures are not expected to exceed 1000 degrees for columns and 1100 degrees for beams. It is common practice in commercial construction to use fire insulating coatings, true enough. But have you ever seen a steel beam on fire? That is what I meant by fire resistive. Wood burns, and steel does not. Many wood buildings are consumed by fire every year. Can you name a single steel frame building that collapsed "due to fire" prior to 9-11 or after 9-11? You can't. Orca