Abstract
The objective of this study is to experimentally explore the implication of an innovative steel rebar with negative Poisson’s ratio effect (termed as NPR steel rebar) on ultra high performance concrete (UHPC) beam under cyclic loading. Distinctly from conventional steel rebar, NPR steel rebar employed in this research inherently owns high ultimate tensile strength of approximately 1100 MPa, high uniform elongation of around 40% and superior durability. Four reinforced UHPC beams are conducted and tested under monotonic/cyclic loading through the four-point bending method. The structural characteristics of all specimens are discussed via failure mode, hysteretic curve, envelop response, stiffness degradation, energy-dissipating capacity, and steel strain evolution and etc. The results show that reinforced UHPC beam longitudinally configured with NPR steel rebar is available to exhibit satisfactory and superior monotonic/cyclic flexural performance. Firstly, the final failure mode of reinforced UHPC beam with NPR steel rebar exhibits multiple (7–8) closely-spacing localized cracks distributing within the pure bending section whether under monotonic or cyclic loading. Additionally, the superior mechanical performance of NPR steel rebar endows reinforced UHPC beam with high flexural capacity, high deformability, excellent stiffness degradation control, and outstanding energy dissipation capacity under cyclic loading. In which, the flexural capacity of UHPC beams reinforced with NPR steel rebar have been upgraded approximately by 47.8%, 52.3% under monotonic and cyclic loading respectively, compared with that of UHPC beams reinforced with HRB 400 steel rebar, meanwhile, the comparison for the energy dissipation capacity is emphasized in stages. Finally, the deflection prediction method for UHPC beam reinforced with NPR steel rebar at normal service stage under monotonic/cyclic loading is proposed. The results of this study provide valuable information for attaining a preliminarily comprehensive understanding of the structural behavior of reinforced UHPC members with NPR steel rebar under monotonic/cyclic loading, and the proposed combination of UHPC and NPR steel rebar provides a new idea for seismic toughness design of anti-bending structural components as well.
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