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Creep of Adhesively-bonded FRP-strengthened Steel Structures at Elevated Temperatures

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Original languageEnglish
Publication statusPublished - 3 Sep 2019
EventAdvanced Composites in Construction - Birmingham, United Kingdom
Duration: 3 Sep 20195 Sep 2019


ConferenceAdvanced Composites in Construction
Abbreviated titleACIC 2019
CountryUnited Kingdom


Ambient cured epoxy adhesive is widely used for bonding fibre reinforced polymer (FRP) plates to structures. The present paper examines a typical strengthening adhesive to investigate the effect of adhesive thermo-viscoelasticity. The response of the adhesive was determined using a series of tests using the multi-frequency scanning mode of a dynamic mechanical analyser (DMA). The thermo-mechanical properties of the adhesive were then characterised using time-temperature superposition parameters and a Prony series representation for generalised Maxwell creep. The adhesive response was in turn used within a finite element model of steel beam strengthened using a bonded CFRP plate to exam the effect of creep in the adhesive at warm temperatures. The study found that thermo-viscoelastic creep of the adhesive bonding layer causes an increase in the slip between the FRP and the structure. Redistribution of the stresses along the beam can allow the plate to maintain its contribution to the moment capacity of the beam; however, as the temperature and time increases, the slip increases, and the CFRP becomes less effective, potentially resulting in failure of the strengthening system and yield of the steel beam.


Advanced Composites in Construction


Birmingham, United Kingdom

Event: Conference

ID: 110784245