Ultra-high-performance concrete (UHPC) enables the design of thinner, longer-span structural elements with reduced or no reinforcing bars. This study investigated the shear behavior of 4-inch-thick UHPC panels containing 2.0% by volume straight steel fibers, tested under combined shear and axial loads using the Universal Panel Tester (UPT) facility. Complementary small-scale direct tension tests (DTTs) and large-scale tension strip tests (TSTs) were conducted to assess the influence of UHPC's tensile characteristics on shear performance. The panels demonstrated ductile responses, maintaining post-peak residual shear capacities exceeding 20% of the maximum shear stress, with TSTs providing a better correlation to UHPC shear behavior than DTTs. Notably, the impact of axial loads on UHPC shear strength was found to be more significant than that observed in conventional concrete as per ACI 318 standards. Additionally, a correlation between fiber alignment and UHPC's tensile behavior was identified, with fiber alignment effects altering the localization stress by up to 39%. This dataset accompanies the journal paper "Shear Behavior of Rebar-Free UHPC Considering Axial Load Effects and Fiber Alignment," published in 2025 (DOI: 10.14359/51743306). The publication provides a detailed overview of the shear laboratory experiments for UHPC and a discussion of the experimental results.

This dataset is associated with an experimental study that investigated the effects of axial load and fiber alignment on the shear behavior of ultra-high-performance concrete (UHPC) panels reinforced with traditional steel bars at a 0.67% reinforcement ratio. Three UHPC panels were tested using the Universal Panel Tester (UPT) facility under different loading scenarios: pure shear, shear with axial compression, and shear with axial tension. Companion material tests, including compression cylinder tests, direct tension tests (DTTs), four-point bending tests (4PBs), and steel bar coupon tests, were conducted to evaluate the mechanical properties of both UHPC and reinforcing bars. The findings revealed that applying an axial tensile load ratio of 33% reduced the shear strength by 12.3%, while an axial compressive load ratio of 5% enhanced the shear strength by 77.6%. Fiber alignment analyses indicated that boundary effects induced by reinforcing bars caused a reduction in the fiber alignment factor by up to 38.1% relative to the DTT specimens.