Advanced Model Development and Validation of Damage-free Precast Structural Connections with Unbonded Post-Tensioned Prestress (2010)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Civil and Natural Resources Engineering
University of Canterbury. Mechanical Engineering
AuthorsRodgers, G.W., Chase, J.G., Mander, J.B., MacRae, G.A.show all
The use of jointed precast concrete and steel connections with unbonded, post-tensioned prestress has been the focus of a significant amount of recent research. These systems provide a controlled inelastic response through gap-opening at the beam-column interface instead of through yielding and damage of the structural elements. The development of a model that captures all of the associated characteristics and provides an accurate prediction of connection response provides significant added confidence in response simulations. A model is developed that utilises a time-incremental model of the connection behaviour that accounts for yielding of the prestress tendons, the reduction or elimination of the prestressing force, friction between the post-tensioning tendons and the containing ducts, and asymmetry from non-centrally located tendons. The model is formulated using incremental versions of the Menegotto-Pinto and Ramberg-Osgood type, providing a smooth, continuous loading and unloading approximation to the piecewise linear behaviour. The model is validated against experimental results for an 80% full-scale jointed precast concrete connection tested with inputs drifts to a maximum of 4%. Results show very good agreement between the model and the experimental results, with errors generally less than ±5%. Overall, the model is generalisable to other connections using steel and concrete rocking connections that utilise this damage-free design approach and is a useful tool for evaluation of connection designs.
CitationRodgers, G.W., Chase, J.G., Mander, J.B., MacRae, G.A. (2010) Advanced Model Development and Validation of Damage-free Precast Structural Connections with Unbonded Post-Tensioned Prestress. Wellington, New Zealand: New Zealand Society of Earthquake Engineering (NZSEE) Conference, 26-28 Mar 2010. Proceedings of the New Zealand Society of Earthquake Engineering (NZSEE) Conference, 8pp.
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ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
40 - Engineering::4005 - Civil engineering::400510 - Structural engineering