Strength design optimization of sandwich composite structures under heavy dynamic loads

Abstract

Recent researches have witnessed an increased interest in the Rapid Runway Repair (RRR) methods to rehabilitate damages that may be caused by different incidents, such as: natural disasters of earthquakes, floods or man-made vandalism in civil wars. RRR is a strategic process for airport operations for civil and peace-making missions. The current RRR techniques like precast concrete slabs, metal mats, and fiberglass mats have different pros and cons. The current study numerically investigates CFRP sandwich composite structure for RRR usage, where its strength is maximized by design optimization to reach the possible carrying aircraft wheel capacity and safety factors. The proposed composite structure is advantageous of no corrosion, low erection time, high capacity-to-weight ratio, same finish of runway surface and repaired area, and can be applied over spots of unlevelled or inadequate bearing capacity of 60 cm diameter. The strength of the basic design of composite sandwich structure is first assessed to its maximum allowed carrying aircraft wheel capacity by FE modelling. Secondly, The Genetic Algorithm (GA) optimization technique is applied for maximizing the strength of the composite structure webs satisfying the minimum safety factor of five failure criteria of Tsai-Wu, Tsai-hill, Hoffman, Hashin and maximum stress. Finally, the achieved results promoted the usage of the composite structure to operate at the taxiways, runways, and theoretically, landing and take-off areas.

Influencia de la adición de fibra de vidrio AR sobre la resistencia a la compresión del concreto f’c 210 kg/cm2. Una revisión sistemática: 2020 – 2024

“…La inserción de fibras de vidrio AR en el concreto ha marcado un antes y después en términos de resistencia a la compresión, como lo demuestran las investigaciones de Kiele et al (2023). Este estudio reveló que, al incrementar la durabilidad del concreto frente a desafíos extremos como el fuego, se logra no solo una mejora en la seguridad estructural sino también en la longevidad de las construcciones, allanando el camino para el desarrollo de materiales más resistentes y sostenibles (Osman et al, 2023).…”