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Experimental Study on Structural Behavior of GFRP-Concrete-Steel Double-Skin Tubular Column under Near-Field Blast Load

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Abstract:

The newly developed hybrid FRP-concrete-steel double-skin tubular column (DSTC) integrates both high corrosion resistance and load-bearing capacity, enabling its potential for applications in high-temperature, high-humidity, and highly corrosive island environments, compared to traditional reinforced concrete or steel columns. However, from the perspective of multi-hazard mitigation, existing research on DSTC columns has predominantly focused on their static and seismic performance, while studies on the behavior of DSTCs under near-field blast load are scarce. In this paper, three glass fiber reinforced polymer (GFRP)-concrete-steel double-skin tubular columns (GFRP-DSTCs) were fabricated and tested under near-field explosion with same TNT equivalent but different scaled distances (ranging from 0.368 m/kg1/3 to 0.240 m/kg1/3). The GFRP tube was made through filament-wound technique and vinyl ester resins, and the glass fibers were oriented at ±80º with respect to the longitudinal axis of the column. The GFRP-DSTCs were installed in a field with bottom end fixed and top end simply supported. The results show that under near-field blast load, the damage to GFRP-DSTCs were concentrated in the region close the charge, where material failure and localized deformation were observed. When the scaled distance was 0.368 m/kg1/3, the specimens showed only localized inward bending, with the surface of the GFRP tube on the blast-facing surface subjected to the impact of detonation products, resulting in a roughened surface. Additionally, the localized surface turned black due to the explosion fireball and numerous circumferential cracks developed on the other area. While the scaled distance was 0.301 m/kg1/3, the specimen exhibited significant localized rupture of the GFRP tube at the blast-facing surface, accompanied by lamination along the thickness direction of the tube, and the concrete at the blast-facing surface was extensively crushed. As the scaled distance further decreased to 0.240 m/kg1/3, the concrete crushing zone extended from the blast-facing surface to the entire side surface with the inner steel tube exposed and bent.

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Periodical:

Advances in Science and Technology (Volume 171)

Pages:

93-100

DOI:

https://doi.org/10.4028/p-r8EhXl

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Online since:

December 2025

Authors:

Jun Yu, Yun Hao Geng*, Xiao Wei Feng

Keywords:

Blast Behavior, Failure Modes, GFRP-Concrete-Steel Double-Skin Tubular Column, Near-Field Explosion

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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