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Behavior of reinforced concrete beams with loss of bond at longitudinal reinforcement

Jeppsson, Joakim and Thelandersson, Sven LU (2003) In Journal of Structural Engineering 129(10). p.1376-1383
Abstract
The effect of loss of bond for longitudinal reinforcement on the structural behavior of RC beams is investigated in a test series of six beams where nominal length without bond is varied. Loss of bond is created with plastic tubes surrounding the longitudinal reinforcement leaving short bonded lengths over support and at positions where stirrups are crossing the longitudinal reinforcement. Using a bond-stress slip relationship made it possible to see that the total bond force could be calculated as the sum of local bond forces. Maximum bond force occurs at maximum load and when the available bond force decreases the load carrying capacity is also reduced. Even for significant loss of bond, the reduction in shear capacity was moderate,... (More)
The effect of loss of bond for longitudinal reinforcement on the structural behavior of RC beams is investigated in a test series of six beams where nominal length without bond is varied. Loss of bond is created with plastic tubes surrounding the longitudinal reinforcement leaving short bonded lengths over support and at positions where stirrups are crossing the longitudinal reinforcement. Using a bond-stress slip relationship made it possible to see that the total bond force could be calculated as the sum of local bond forces. Maximum bond force occurs at maximum load and when the available bond force decreases the load carrying capacity is also reduced. Even for significant loss of bond, the reduction in shear capacity was moderate, implying that short bond lengths are sufficient to create high bond forces. Local areas with bond contributes efficiently to create anchorage for the longitudinal bars. It was also found that the loss of bond was compensated by increased utilization of stirrups, and that loss of bond does not lead to more brittle types of failure. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Structural Engineering
volume
129
issue
10
pages
1376 - 1383
publisher
American Society of Civil Engineers (ASCE)
external identifiers
  • wos:000185407600010
  • scopus:10844247253
ISSN
0733-9445
DOI
language
English
LU publication?
yes
id
fe51858c-1a74-44f3-bccf-6b4ddbe96703 (old id 300094)
date added to LUP
2007-09-13 13:12:27
date last changed
2018-05-29 11:45:37
@article{fe51858c-1a74-44f3-bccf-6b4ddbe96703,
  abstract     = {The effect of loss of bond for longitudinal reinforcement on the structural behavior of RC beams is investigated in a test series of six beams where nominal length without bond is varied. Loss of bond is created with plastic tubes surrounding the longitudinal reinforcement leaving short bonded lengths over support and at positions where stirrups are crossing the longitudinal reinforcement. Using a bond-stress slip relationship made it possible to see that the total bond force could be calculated as the sum of local bond forces. Maximum bond force occurs at maximum load and when the available bond force decreases the load carrying capacity is also reduced. Even for significant loss of bond, the reduction in shear capacity was moderate, implying that short bond lengths are sufficient to create high bond forces. Local areas with bond contributes efficiently to create anchorage for the longitudinal bars. It was also found that the loss of bond was compensated by increased utilization of stirrups, and that loss of bond does not lead to more brittle types of failure.},
  author       = {Jeppsson, Joakim and Thelandersson, Sven},
  issn         = {0733-9445},
  language     = {eng},
  number       = {10},
  pages        = {1376--1383},
  publisher    = {American Society of Civil Engineers (ASCE)},
  series       = {Journal of Structural Engineering},
  title        = {Behavior of reinforced concrete beams with loss of bond at longitudinal reinforcement},
  url          = {http://dx.doi.org/},
  volume       = {129},
  year         = {2003},
}