Effect of High Strength Steel on the Flexural Behavior of High Strength Concrete and Fiber-Reinforced Concrete Specimens

Abstract eng:
A series of reinforced concrete (RC) components with high strength materials were tested under pure flexural monotonic and cyclic quasi-static loading protocols. The specimen materials included high strength concrete (HSC), and ultra-high strength steel (UHSS). In some specimens steel fibers were added to the concrete mix to create high strength fiber reinforced concrete (HSFRC) specimens. The series of eight specimens include, for the first time, a nonlinear response comparison of HSC and HSFRC specimens with UHSS under monotonic and cyclic loading protocols. The use of UHSS on HSC components increased the ultimate flexural capacity by more than 60%, as compared with a similar component with conventional steel and the same steel area. However, the rotational capacity of HSCfy100 specimens decreased by more than 40% due to the lower elongation at fracture of UHSS. Also, the drift at peak strength was consistently larger for monotonic tests, underlining the need of carrying out monotonic tests to identify this nonlinear parameter. The addition of steel fibers to HSC specimens increased the peak strength by an additional 10%, and greatly reduced cracking and spalling of HSC specimens. Nevertheless, the energy dissipation capacity of the specimens did not increase by the presence of fibers. The implications of different hysteretic energy dissipation capabilities were investigated using single-degree-of-freedom models subjected to far-field ground motions. For this purpose, concentrated plasticity models that account for strength and stiffness deterioration were calibrated based on the experimental results. No previous studies have simultaneously addressed the monotonic and cyclic response of HSC components with UHSS rebars. This study provides the first numerical analysis on these elements that is supported by experimental data.

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