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arun.kashikar SEFI Member

Joined: 26 Jan 2003 Posts: 10
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Posted: Wed Jul 13, 2005 3:56 am Post subject: Message No 32 - Guaranteed min & Max strength of rebar |
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If I recollect correctly IS:13920 puts upper limit on yield strength of reinforcement as 415MPa.
Regards,
Arun Kashikar
-----Original Message----- From: inchak@tatasteel.com [mailto:inchak@tatasteel.com] Sent: Tuesday, July 12, 2005 9:32 PM To: KASHIKAR Arun Subject: [Econf] Message No 32 - Guaranteed min & Max strength of rebar
************************************************* SEFI e-Conference on Steel Reinforcement from June 27 to July 17, 2005 ************************************************* Sponsored by TATA Steel *************************************************
Dear Mr. Vipul Ahuja, Excellent point I reproduce your concern QUOTE Back in the 80's in the US,a need felt among structural engineers for weldable "Tor" steel to be available to them that not only had a guaranteed minimum strength but also a maximum strength. The reason was that in order for the strong column weak beam theory to be implemented properly the beam steel could not be stronger than the column steel in terms of material strength. Also weldability avoided the usual site problems. The answer from the industry to this was ATMS A706 bars. Do we have an IS equivalent to this and if not is there any hope in the near future.
UNQUOTE
You are quite correct. BIS does not have any upper limit on strength. Only lower limt is there. However we have realized the importance of this upper limit and offered to provide BOTH upper and lower limits to the Yield strength in line with not only the ASTM A 706 but also the Australia / New Zealand code as follows: 1) YIELD STRENGTH (MPa) MIN. which decides the design load IS 1786(Fe 415) - 415 Euronorm - 450 ASTM A706 (GR 60) - 420 Australia / New Zealand (500 N) - 500 Australia / New Zealand (500 NE) - 500 TATA STEEL Super Ductile Rebars - 415
2) YIELD STRENGTH (MPa) MAX. Some, but not all specifications put a cap on the maximum permissible yield strength. The idea is that the bar should not unduly resist plastic deformation (yielding) thus allowing excessive stress to build up in the concrete. The various specifications stand thus:IS 1786(Fe 415) - NA Euronorm - NA ASTM A706 (GR 60) - 540 Australia / New Zealand (500 N) - 650 Australia / New Zealand (500 NE) - 600 TATA STEEL Super Ductile Rebars - 550
Please let me know if you find this to be a step in the right direction. However to get it incorporated in the Indian Specification(s) you need to initiate the process with the Bureau of Indian Standards.
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