Engineers are often interested in creating structures with unique and innovative architecture. One of the challenges in making these structures is the difficulty in using specific materials and achieving the desired shape. In this research, large-scale structures were built using Miura’s origami pattern, high and ultra-high-performance canvas concrete, and ultra-high-performance fiber-reinforced concrete to address these challenges. The performance of structures under flexural load was evaluated. Four non-sandwich structures and one sandwich structure were built. Non-sandwich structures were made using high-performance canvas concrete in strengthened and non-strengthened states, ultra-high-performance fiber-reinforced concrete (UHPFRC), and ultra-high-performance canvas concrete. Using the Miura pattern in these specimens increased the structures’ load capacity by 2.5 to 4.3 times under the same conditions. Also, the specimens made with high-quality concrete reached ultimate loads that were almost equal (96.5%) or slightly greater (≈9%) than those of FRP-strengthened specimens made with lower-quality concrete. Due to differences in the mechanical characteristics of the materials used and in previous research specimens, two methods were introduced to analyze these structures: equilibrium in the crack and the equivalent-section method. The results of the equilibrium in the crack method were more accurate and could predict the maximum load of these structures with an error of less than 8.8%. Also, a sandwich structure with an origami core was fabricated using high-performance concrete and UHPFRC upper and lower plates, and a method for its analysis was presented.
Mohammadsalehi et al. (Thu,) studied this question.