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2 2025

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Enhancing structural reusability and durability: A review of steel-concrete shear connector systems in modular construction

Anbu Hemanth Kumar, Kothandapani Karthikeyan

Advances in Science and Technology. Research Journal

2025

Vol. 19, no. 7

70--97

This paper investigates the evolution and performance of advanced bolt and dowel-based shear connectors in modular and composite construction systems, focusing on steel-concrete composites, precast shear walls, modular beams, and demountable frames. Key innovations, such as high-strength friction-grip bolts (HSFGBs), threaded stud connectors, Y-stud bolts, and hybrid nut-bolt systems, are examined for their load transfer efficiency, shear resistance, and assembly ease. The study analyzes frictional mechanisms, dynamic performance, and the effectiveness of single vs. double nut configurations in structural joints. Blind bolts, reinforced hybrid bolts, and locking nuts are assessed for demountable applications. Coupler systems, including cylindrical and pretensioned bolts, are evaluated for mitigating deformations and addressing thread penetration. Innovative shear connectors, such as clamping connectors and yielding pockets, are also explored for their impact on slip capacity, stiffness, and fatigue resistance. Future research focuses on improving ductility, energy dissipation, rapid assembly, and sustainability, advancing the reusability and adaptability of modular and composite systems for more resilient structures.

Enhancing impact resistance of concrete slabs

Anbu Hemanth Kumar, P Udhayanithi, Kothandapani Karthikeyan, M Senthilpandian

Advances in Science and Technology. Research Journal

2025

Vol. 19, no. 8

30--43

The impact resistance of concrete slabs was investigated through a comparative experimental analysis of Conventional Concrete (CC) and Steel Fiber Reinforced Concrete (SFRC), with a focus on dynamic performance using the Ratio of Crack Resistance (Rcr) as a core evaluative metric. The research aims to address the limitations of CC under high-strain-rate conditions and explore the effectiveness of steel fiber reinforcement in mitigating impact-induced damage. CC slabs exhibited brittle failure with a low Rcr of 0.09, characterized by rapid crack propagation and negligible energy dissipation. In contrast, SFRC slabs demonstrated a substantial improvement in impact resistance, achieving Rcr values between 0.75 and 1.35. This performance gain is directly linked to the inclusion of 1% steel fibers, which enhanced tensile capacity, bridged developing cracks, and delayed crack propagation, ultimately shifting the failure mode from brittle to ductile. Repeated impact testing further revealed that SFRC slabs maintained structural integrity even after perforation onset. The study establishes the significance of fiber content and distribution in optimizing impact performance and reducing the risk of punching shear failure. These findings position SFRC as a structurally resilient solution for applications subjected to dynamic loading, such as protective slabs, industrial floors, and critical transportation infrastructure.