The study performed in this paper is limited to the reinforced concrete structures, in which the behavior of reinforced concrete beams retrofitted with FRP fabrics subjected to extreme loading is investigated. In this regard, numerical modeling using finite element software LS-DYNA is carried out. Numerical results are validated against the results of laboratory experiments. Strengthening of beams with an external composite layer of carbon, glass and Kevlar fibers are considered. Common performance criteria of concrete members such as deflection ratio, support rotation, and ductility ratio as well as crack pattern and energy absorption are investigated. Results show full wrapping mode with carbon fibers leads to the most reductions in the growth of flexural cracks as well as flexural-shear cracks along the free span of the beam. The ductility of the beam is reduced in different states of retrofitting, which the greatest amount of ductility reduction is obtained when reinforced with carbon fibers. Elastic and plastic energies absorbed by the retrofitted beam are, respectively, increased and decreased in all of the investigated cases. Retrofitting with carbon fibers in different states shows the largest increase in the absorption of elastic energy and also the greatest reduction in the plastic energy absorption.

中文翻译：

---

承受极端冲击载荷的 FRP 织物加固钢筋混凝土梁的性能标准评估

本文中进行的研究仅限于钢筋混凝土结构，其中研究了用 FRP 织物改造的钢筋混凝土梁在极端载荷下的行为。在这方面，使用有限元软件LS-DYNA进行数值建模。数值结果根据实验室实验结果进行验证。考虑使用碳纤维、玻璃纤维和 Kevlar 纤维的外部复合层加强梁。研究了混凝土构件的常见性能标准，例如挠度比、支撑旋转和延性比以及裂缝模式和能量吸收。结果表明，碳纤维全包覆模式可最大程度地减少沿梁自由跨度的弯曲裂纹和弯曲剪切裂纹的增长。梁的延性在不同改造状态下均有所降低，其中以碳纤维加固时延性降低量最大。在所有研究的情况下，改装梁吸收的弹性和塑性能量分别增加和减少。用不同状态的碳纤维改造显示弹性能量的吸收增加最大，塑性能量吸收的减少也最大。