Ultimate Capacity Performance of Various Intelligent Reinforced Concrete Beams using Smart Reinforcement Alloy
The use of shape memory alloy in structural engineering contributes to environmental sustainability by extending the structure's life serviceability while requiring little or no maintenance or repairs in the face of natural and man-made hazards. Despite the Nitnol smart rods' remarkable ability to recover deformation damage and close opening cracks, remaining cracks must still be manually repaired or operated by self-restoring operation. The study's goal is the development and implementation of smart material in the structures by building a pump-automated system that can inject repairing substance through predicted cracks in shear or flexural places using inner ducts. It works by receiving an indicative from crack sensors and measuring (crack breadth and unit deformations) with a view to start injection following a rapid influence on the structure. Experimentally, the novel strengthening modes were examined for one span concrete beams having inner injected channels and/or Nitinol rods against static cyclic load (loading – off loading) until the fail in various flexural reinforcement ratios. Mode of strengthening approaches and flexural reinforcement ratios were the variables investigated. The impact of the proposed approaches on beam vertical displacement, crack pattern, and utmost loads was also investigated for entire examined beams. When contrasted to the reference beams, the beams with both inner injected channels and super elastic Nitinol rods demonstrated a 9 % improvement in utmost load. Furthermore, at the maximal load, the vertical displacement dropped by 20%.
Keywords - Shape Memory Alloy (SMA); The shape memory effect (SME): Super Elastic effect (SE); flexural reinforcement ratios (µ); NiTi Alloy (Nitnol).