Experimental study on bond degradation in reinforced concrete tension members under cyclic loads
METADATA ONLY
Loading...
Author / Producer
Date
2022
Publication Type
Conference Paper
ETH Bibliography
yes
Citations
Altmetric
METADATA ONLY
Data
Rights / License
Abstract
The accurate assessment of existing structures requires refined bond-slip models, which could account for the unloading and reloading of structures. Although bond has been investigated for as long as reinforced concrete exists, most bond-related design provisions rely on simplified empirical approaches. A reason for that are the technical challenges of measuring the bond. With the development of new measurement technologies, the highly complex bond behaviour can be assessed along the embedded reinforcement length and throughout the lifetime of a structure, without affecting the bond conditions. This paper presents first selected results of an extensive experimental campaign comprising tension chord specimens subjected to static, cyclic, and high-cyclic loads. The loading history and load amplitude were varied in the tests, and all reinforcing bars were instrumented with distributed fibre optical sensors. This novel measurement technique allows for a quasi continuous strain measurement along the bars. The nominal steel stress distribution can then be derived using constitutive laws, and the bond shear stress distribution follows from the latter by equilibrium. The assessment of the concrete contribution between the cracks in the tension chords shows a pronounced reduction of tension stiffening with an increasing number of load cycles, causing larger deformations. The findings contribute to a better understanding of the deterioration process due to repeated loads at the interface of concrete and steel.
Permanent link
Publication status
published
External links
Book title
Bond in Concrete 2022: Bond, Anchorage, Detailing
Journal / series
Volume
Pages / Article No.
1013 - 1024
Publisher
Institute of Construction Materials, University of Stuttgart
Event
5th International Conference Bond in Concrete 2022
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03353 - Vogel, Thomas (emeritus) / Vogel, Thomas (emeritus)
09469 - Kaufmann, Walter / Kaufmann, Walter
Notes
Conference lecture held on July 26, 2022
Funding
Related publications and datasets
Is part of: 10.18419/opus-12271