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Fy Reduction According to Thickness
Currently I am working on a structure that was constructed in the 1960s or early 1970s, and the steel used was G40.12. The historical listing (page 6-5) of the Handbook of Steel Construction (7th edition) states that "Yield reduces when thickness exceeds 40 mm". Could you suggest any reference materials where I can find out by how much the yield decreases with the thickness? – J.S
ASTM A572 and A992 steels
For my last project, I had specified CSA G40.21 350W for all W-shapes but the mill test certificate indicated that the steel was made to ASTM A572 grade 50 / A992. Is this acceptable for use Canada? – D.T.
COR-TEN(TM) Steel as a Facade Element
I am interested in using Cor-TenTM steel to replace some facade elements in a multi-storey building that I am renovating. Is it difficult to obtain such steels? What different types are there? I just went by the new McGill School of Music, which has a complete wall element that uses Cor-tenTM steel. It has a nice rich golden colour. Will it more or less stay that colour? — J.-C. B.
The Fy of 1967 Canadian Steel
I am presently checking the roof joists of a building that was constructed in 1967. If I backtrack using the snow loads of that period, it would appear that the joists were built with steel having an Fy of 380 MPa (55 ksi), which is rather surprising. Would you, by any chance, have a list of historical steels that were used during that time, either plates or rolled angles?
-- B.C.
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Seam Strength of HSS
I am trying to find information about the mechanical properties of the weld seam in hot-formed hollow structural sections without much success. Can you help? – M.C.
Big Tubes
I’ve received several questions on large tubular sections, 508 mm (20”) diameter or larger, so I thought I would group them in one big three-part question and answer.
Field Welding of a HSS Beam
For adding a support structure that allows us to hang a scoreboard in an existing sports centre, one engineer suggested we weld an HSS beam directly onto the flange of a fairly large W column. However, we are now working with another engineer that questions this practice. I am an architect and would like to know if we need to be concerned? - B.G.
Reinforcement of Steel Columns
Our firm will be involved in modernizing a hospital. The building is in steel and we have to reinforce the existing columns for seismic rehabilitation and increased gravity loads due to additional floors. Unfortunately, we have found very little literature on the subject of steel column reinforcement under load. Do you know of a good source of references? - P.M.
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