Anti-penetration performance of novel double steel ferrules confined and prestressed concrete

• Published in: Structures (Oxford) Vol. 59; p. 105700
• Main Authors: Sun, Xiaochen, Wang, Ziguo, Sun, Yuyan, Wang, Songtao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2024
• Subjects: Concrete-filled steel tube; Numerical simulation; Penetration; Prestressed concrete; Concrete-filled steel tube; Numerical simulation; Prestressed concrete; Penetration
• ISSN: 2352-0124; 2352-0124
• DOI: 10.1016/j.istruc.2023.105700

The anti-penetration performance of concrete can be significantly improved when it is confined by a steel tube, and this improvement can be further augmented with the application of prestress. However, conventional methods for prestressing are challenging to implement in concrete-filled steel tubes. This study proposed the double steel ferrules confined and prestressed concrete. The feasibility of implementing prestress through the wedge mechanism was validated by employing the LS-DYNA explicit finite element software, and the anti-penetration performance of the prestressed confined concrete targets was investigated using a restart algorithm. The numerical simulation results reveal that this double steel ferrules prestressing method can offer a more uniform distribution of prestress and superior overall anti-penetration performance of the concrete target compared with the single steel ferrule prestressing method. Parametric analysis indicates that the anti-penetration performance of the concrete target improves with increasing prestress within a certain range, and this improvement becomes more significant as the projectile initial velocity increases; the prestress increases approximately linearly with the margin (δ) but is minimally affected by concrete strength and the taper angle. Moreover, at a steel content of 20%, both the anti-penetration performance and the steel ferrule utilization efficiency of the prestressed concrete target reach satisfactory levels. The proposed double steel ferrules prestressing method provides a novel solution for improving the anti-penetration performance of brittle materials, such as concrete, ceramics, and glass.