Abstract
The bond behavior of prestressing strands is of great importance for the capacity of precast prestressed concrete structures. There are cases in design and manufacturing practice where strands need to be bundled. However, the current design codes have no design guidelines for application of bundles of strands in precast prestressed concrete structures and there is a lack of information about their bond behavior. Therefore, the investigation of bond behavior of two bundled three-wire strands is presented in this article. Twenty three hinged beam specimens were tested to study unidirectional constant amplitude cyclic load (different amplitude and number of load cycles) influence as well as freezing and thawing effect on bond properties of two bundled three-wire strands. The three mechanisms: adhesion, friction, and several mechanical interlocking actions were found to be present at the strand concrete interface at different slip values. The results from the experiments showed that cyclic load did not negatively influence the bond strength of two bundled strands. Additionally, combined action of cyclic loading, freezing and thawing resulted in a decrease of bond strength. Based on experimental results the new static and cyclic bond parameters for two bundled three-wire strands are proposed on the basis of τ-s and S-N models provided in Model Code 2010.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.