Impact resistance and failure mechanisms of high strength-high ductility concrete beams under repeated low-velocity impacts

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-09-29 DOI:10.1016/j.compstruct.2025.119712

Jintao Liu , Xinyang Yu , Sijie Han , Bing Wang , Xin Zhao , Deyu Kong , Surendra P. Shah

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Abstract

Despite significant advances in understanding the material properties of High Strength-High Ductility Concrete (HSHDC), there remains a critical gap in studies examining the influence of reinforcement configurations on the impact resistance of HSHDC components in practical applications. This study explores the influence of reinforcement ratios on the impact resistance of HSHDC beams through multiple drop-weight impact tests. Key parameters including impact force, reaction force, deflection, energy dissipation, crack propagation, and failure mechanisms, were analyzed. The results reveal that, with the same reinforcement ratio, utilization of HSHDC can significantly reduce mid-span, peak deflections and spall compared to traditional reinforced concrete (RC), while enhancing cumulative energy dissipation by 12.9%. Increasing the ratio to 1.67% transitioned the failure mode to adequately reinforced, resulting in a 155% increase in cumulative energy dissipation compared to the 0.74% group. Higher longitudinal reinforcement ratios promote more uniform deflection distribution and slower increases in post-impact residual deflection, exhibiting a “pseudo-stabilization” phenomenon similar to that observed in metallic structures. Additionally, HSHDC’s superior shear resistance leads to ductile shear failure behavior. These findings highlight the potential of HSHDC to enhance structural performance while allowing for reduced stirrup usage, offering significant economic and practical benefits for construction applications.

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高强高延性混凝土梁在多次低速冲击下的抗冲击性能及破坏机理

尽管在了解高强高延性混凝土（HSHDC）的材料特性方面取得了重大进展，但在研究钢筋配置对HSHDC组件在实际应用中的抗冲击性的影响方面，仍然存在一个关键的空白。通过多次落锤冲击试验，探讨配筋率对HSHDC梁抗冲击性能的影响。关键参数包括冲击力、反作用力、挠度、能量耗散、裂纹扩展和破坏机制。结果表明，在配筋率相同的情况下，与传统钢筋混凝土（RC）相比，利用HSHDC可显著降低跨中、峰值挠度和碎裂，同时提高累计耗能12.9%。将该比率增加到1.67%使破坏模式转变为充分加固，与0.74%组相比，累积能量耗散增加了155%。纵向配筋率越高，挠度分布越均匀，冲击后残余挠度增加越慢，表现出与金属结构相似的“伪稳定”现象。此外，HSHDC优越的抗剪性能导致其延性剪切破坏行为。这些发现强调了HSHDC在提高结构性能的同时减少箍箍的使用，为建筑应用提供了显著的经济和实际效益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.