Advanced model development for jointed precast concrete connections utilising unbonded post-tensioned prestress
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Damage-free structural design methods have received significant research attention in recent years due to large costs associated with sacrificial design methods. In particular, jointed precast concrete connections with unbonded, post-tensioned prestress have been the focus of a significant amount of this research. These systems provide damage-free inelastic response through gap-opening at the beam-column interface instead of through yielding and damage of the structural elements. A model that captures all the different connection characteristics and provides an accurate prediction of connection response is a useful tool for performance based analysis and design. A time-incremental model of the connection behavior is developed that accounts for yielding of the prestressing tendons, reduction or elimination of the prestressing force, friction between the post-tensioning tendons and the containing ducts, and asymmetry from noncentrally located tendons. The model is formulated using incremental versions of smooth functions to provide a continuous loading and unloading representation of behavior. The model is validated against experimental results for full-scale jointed precast concrete connection subassemblage tested with reversed sinusoidal inputs up to 4% drift. Results show very good agreement between the model and expe rimental results, with errors generally well less than 5%.
