Numerical and Finite-Element Analysis of Short Ultrahigh-Performance Fiber-Reinforced Concrete Columns: Fid-Bau Portal

Numerical and Finite-Element Analysis of Short Ultrahigh-Performance Fiber-Reinforced Concrete Columns

Fang, C. / Mohamed Ali, M. S. / Sheikh, A. H. / Singh, M.

This paper describes the development of numerical and finite-element (FE) models for investigating the behaviors of short ultrahigh-performance fiber-reinforced concrete (UHPFRC) columns under concentric or eccentric loading conditions. A generic mechanic-based partial-interaction (PI) approach that is applicable to both flexural and axial members manufactured by conventional fiber-reinforced concrete has been suitably modified to analyze the structural response of the short UHPFRC columns. Moreover, FE modeling was also conducted to study the behaviors of UHPFRC members subjected to different loading conditions. Both models aim to generate load-axial deflection ( $P - δ_{axial}$ ) or load-midheight deflection ( $P - δ_{mid}$ ) relationships for concentrically or eccentrically loaded columns, as well as a load-midspan deflection ( $P - δ_{mid}$ ) relationship for a beam subjected to three-point bending. Simulated results display an excellent agreement with test results, and the model can accurately predict the structural response of the UHPFRC columns. To aid in the development of a design guideline for the short UHPFRC columns, a load-moment ( $P - M$ ) interaction envelope generated by the numerical model is proposed, and it shows a good correlation to the experimental results.