Title: Moment-Curvature-Deformation Response of Post- Tensioned Ultra-High-Performance Concrete Beams

Author(s): Mehmet Dogu and Fatmir Menkulasi

Publication: Structural Journal

Volume: 119

Issue: 2

Appears on pages(s): 301-315

Keywords: ductility; moment-curvature-deformation; post-tensioning; ultra-high-performance concrete (UHPC); unbonded tendons

DOI: 10.14359/51734344

Date: 3/1/2022

Abstract:
A mechanics-based analytical method for obtaining the complete moment-curvature-deformation response of ultra-high-performance concrete (UHPC) beams post-tensioned with internal unbonded tendons is presented. The proposed procedure does not rely on empiricism other than what is included in the assumed material constitutive models and provides the means to determine the variation of curvature and deflection as the beam is loaded to failure, thus providing an avenue to quantify ductility at the cross section and member level. The influence of various constitutive models for the compressive and tensile domain of UHPC, prestressed and non-prestressed reinforcement ratio, loading configuration, and tendon profile on the complete beam flexural behavior is quantified. The most influential parameters for cross section- and member-level ductility are the ultimate UHPC strain in tension and loading configuration, respectively.