Journal of Composite Materials · 2013 · 54 citations · 18 references
EngineeringCivil EngineeringMaterials EngineeringBuilding MaterialsStructural EngineeringStructural MaterialsFiber-reinforced CompositesImpact BehaviorImpact MechanicsImpact ResistanceReinforced Concrete StructuresStructural Response AnalysisDrop-weight Impact TestingDrop-weight TestingFiber-reinforced PolymersImpact Load ResistanceImpact Resistance TestingLow-velocity ImpactStrengthening Of SlabsStructural Impact Resistance
The study estimates the impact resistance of steel‑fiber‑reinforced concrete slabs bonded with fiber‑reinforced polymer sheets by drop‑weight impact testing of 50 × 100 × 350 mm slabs containing 0.5–1.5 % steel fibers. Dynamic response under low‑velocity impact was modeled with LS‑DYNA using strain‑rate dependent material models and debonding failure analysis, and the simulations were validated against the experimental results. The FRP‑strengthened slabs exhibited higher maximum impact load, greater dissipated energy, more drops before failure, and reduced deflection and support rotation, indicating a substantial improvement in impact resistance.
In this study, to estimate the impact resistance of steel fiber-reinforced concrete slabs strengthened with fiber-reinforced polymer sheets, a series of 50 × 100 × 350 mm 3 sized slabs with 0.5%–1.5% (by volume) of steel fibers and two types of fiber-reinforced polymer sheets were impact-tested using drop-weight impact test machine. From the test results, the maximum impact load, dissipated energy and the number of drops before failure were all increased, whereas the maximum deflection and support rotation were reduced by strengthening the steel fiber-reinforced concrete slabs with externally bonded fiber-reinforced polymer sheets in the tensile zone. It was noticed that the impact resistance of the steel fiber-reinforced concrete slabs was substantially improved by externally strengthening the fiber-reinforced polymer sheets. In addition, the dynamic response of the steel fiber-reinforced concrete slabs strengthened with fiber-reinforced polymer sheets under a low-velocity impact load was analyzed using explicit code LS-DYNA with strain rate-dependent material models and debonding failure analysis. These numerical analyses were verified by comparing with the experimental results.
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Blast Loading and Blast Effects on Structures – An Overview
Tuan Ngo, Priyan Mendis, Anil Gupta et al. · Electronic Journal of Structural Engineering · 2007 · 590 citations · Full text