Sustained load performance of adhesive fastening systems in concrete
2016 (English)In: Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure / [ed] Jaap Bakker, Dan M. Frangopol and Klaas van Breugel, London, UK: Taylor & Francis Group, 2016, 421- p.Conference paper (Refereed)
In recent years, application of post-installed adhesive anchors has increased since they provide greater flexibility in design of new structural systems as well as for strengthening of existing structures. In general, adhesive products are viscoelastic by nature and have a time-dependent behavior. Therefore, adhesive anchors subjected to sustained loads are prone to creep over their service life which may considerably affect their long-term performance.
Although the short-term performance of adhesive anchors has been extensively studied in literature, their long-term creep behavior under sustained loads is not very well known. To increase the knowledge regarding the sustained loading performance of adhesive anchors, a long-term test program was defined and started in 1984. The main objective of this test program was to study the influence of different sustained loading levels and several in-service conditions on the anchors’ long-term performance. Adhesive bonded anchors with 16 and 20 mm diameters were subjected to sustained load levels between approximately 23 and 70% of their mean ultimate short-term capacities. Their creep deformations were monitored up to approximately 28.4 years. The tested in-service conditions were indoor, outdoor, wetness (i.e. water on the surface of concrete) and presence in the concrete of salt additives.
The tested adhesive anchors in the indoor conditions showed relatively small creep during test period and they could carry sustained loads up to 47% of their mean ultimate short-term capacities. However, the adhesive anchors under outdoor environment showed larger creep deformations and failure occurred for sustained loads higher than 23% of the anchors’ mean ultimate short-time capacities. The wet condition seemed to have no adverse effect on the anchors’ creep behavior, but caused corrosion of the steel in the anchors over time. The salt additives in concrete had negligible influence on the long-term performance and creep deformation of the tested adhesive anchors.
Place, publisher, year, edition, pages
London, UK: Taylor & Francis Group, 2016. 421- p.
Sustained load; Adhesive anchor; Anchorage; Bonded anchor; Creep behavior; Fastening
Civil Engineering Infrastructure Engineering
Research subject Structural Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-62877ISBN: 978-1-138-02847-0 (print)ISBN: 978-1-315-37517-5 (electronic)OAI: oai:DiVA.org:ltu-62877DiVA: diva2:1086887
Fifth International Symposium on Life-Cycle Civil Engineering (IALCCE) 2016, Delft, 16-20 October 2016