The behavior of UHPC deep beam using the hybrid combination of steel and basalt fibers
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Keywords:
hybrid fibers, basalt fibers, steel fibers, deep beam, mid-span deflection, diag- onal cracks, ultimate shear capacity.Abstract
This research looks at how hybrid fiber reinforcement changes the shear behavior of ultra-high performance concrete (UHPC), focusing on deep beams that are likely to fail in this way. The research involved casting four groups of deep beams with different fiber fractions and a/d ratios, comparing them with the ultra-high-strength concrete UHSC. Add 1% of basalt fibers to a UHSC specimen, the diagonal shear cracks get 86.66% bigger, and the ultimate shear capacity gets 28.69% bigger. In steel fiber specimens with the same fraction volume, the diagonal shear crack load increased by 98.54%, and the ultimate shear capacity increased by 55.24%. In hybrid fiber ultra-high-performance concrete (UHPC) deep beams, which have the same percentage of fibers (75% basalt fibers and 25% steel fibers), the diagonal shear capacity improves by 97.08%, and the ultimate shear capacity increases by 32.33%. The investigation revealed that altering the proportions of fibers (25% basalt fibers and 75% steel fibers) resulted in a 67.81% enhancement in the load at which diagonal shear cracks occur and a 44.71% increase in the maximum shear load. The optimal development performance may be achieved by utilizing the ideal basalt and steel fibers proportion. These performance improvements are also observed when the shear span ratio a/d changes from 1.8 to 1.0. Hybrid beams also displayed more significant ductility gains than single-fiber designs. The study focuses on understanding the impact of hybrid fiber reinforcement on shear behavior and enhancing UHPC deep beam shear strength and ductility, potentially leading to a new construction era by optimizing hybrid fiber use.
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