|
View previous topic :: View next topic |
Author |
Message |
rupen SEFI Member

Joined: 26 Jan 2003 Posts: 15 Location: Madras
|
Posted: Mon Jul 11, 2005 12:41 pm Post subject: Bending of bars |
|
|
Dear Sri Kadam:
You are absolutely right in saying bar bending means plastic deformation at the bend. I would like to extend this discussion.
Generally, the bending radius recommended is arrived at through extensive experimentation for different bar diameters. The minimum radius is recommended to prevent the extreme fibers of the bars from being stretched far beyond the yield point (plastic deformation), or, being stretched too close to the rupture strain. In other words, sharp bending may cause fracture of the outer fibers of the bar during bending itself. Thus, in essence, it is a way to preserve some capacity of the material to be strained later under the external loads. So, it has its effect on the strength of the structure also.
Further, now with TMT bars becoming common in use, is it okay to continue to use the recommended bending radius (originally developed for normal steel bars), or are these numbers already validated through experiments for TMT bars? This question arises because the TMT bar is now a non-homogenous cross-section with a softer core, as against the previous bars that are homogenous across the cross section.
With regards..
Rupen Goswami
IIT Kanpur
-----Original Message----- From: p_kadam@vsnl.com [mailto:p_kadam@vsnl.com] Sent: Saturday, 09 July, 2005 03:18 PM Subject: [Econf] [Econf] Bending of bars
Dear all,
What is the effect(qualitative/quantitative) of sharp bending(bending radius being smaller than recommended)?As such bar bending is a plastic deformation.How does it affect the strength?
regards,
P Kadam
Posted via Email |
|
Back to top |
|
 |
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum
|
|
|
|