Investigation on the Flexural Behavior of Reinforced UHPC T-Beams with Different Tensile Strain-Hardening Properties of Base Materials

Ultrahigh performance concrete (UHPC) has been broadly endorsed for many applications in the construction industry due to its superior mechanical properties and excellent durability. Nevertheless, UHPC utilization as full and large structural components is still limited due to the lack of standardized design guidelines and consistent mechanical models. This study presents a numerical investigation on the flexural behavior of UHPC T-beams under the influence of the tensile grade of UHPC, and the reinforcement ratio. The behavior is studied under three conditions relating the UHPC tensile strain to the reinforcement yielding strain. That is, UHPC peak tensile strain is smaller than, equal to, or larger than the yielding strain of the rebar, reflecting the sequence of crack localization and yielding of rebars. Each condition is examined against a reinforcement ratio ranging from low to high ratio. The nonlinear finite element modeling approach is validated by experimental data available in the literature.

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