Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Finite Element Analysis-Based Evaluation of Normal and FRP-Coated Concrete Bridge Piers Under Close-in Blast Loading Scenarios

Document Type : Original Article

Authors
Mokhtar Ansari 1
Naser Safaeian Hamzehkolaei 2
1 Assistant Professor,Faculty of Engineering, Bozorgmehr University of Qaenat. Qaen, Iran
2 Assistant Professor. Faculty of engineering, Bozorgmehr University of Qaenat, Qaen, Iran
10.22065/jsce.2024.432016.3305
Abstract
Nowadays, Fibre-reinforced polymer sheets are used to ensure the serviceability of the bridge at different levels of damage after the explosion and to improve their performance. In this study, the performance of the FRP-coated reinforced concrete bridge piers under various explosion scenarios was investigated using Abaqus software. The effect of section shape was examined by considering rectangular, square, box, and circular sections with equal cross-sectional area and reinforcement. All models exhibited a sharp increase in base shear at the beginning of the explosion, followed by a decrease in an oscillatory manner. However, the rectangular section showed the maximum response in a shorter time. The investigation of performance indicators such as maximum stress, displacement change, base shear, energy absorption, and damage level under different explosion scenarios showed that the rectangular and circular sections had the best performance and the most damage, respectively. The effect of TNT weight and blast distance was also examined. Increasing the TNT weight from 100 to 200 and 300 kg led to an increase in maximum displacement (220% and 419%, respectively), plastic strain energy absorption (140% and 302%), and damage intensity, while shear capacity decreased. However, the explosion distance had a more significant effect on structural performance. With an increase in the explosion distance from 1 to 3 and 5 meters, the maximum displacement, shear capacity, and strain energy absorption decreased by 96% and 98%, 53% and 61%, and 92% and 95%, respectively. For a specific TNT value at a safe distance, the column does not suffer noticeable damage. However, as the TNT weight increased, even at a safe distance, the severity of damage increased. Furthermore, column retrofitting with only one FRP layer increased the system's capacity by 28.5% while reducing the maximum displacement by 30%.
Keywords
Reinforced concrete bridge pier
Fiber-Reinforced Polymer
Close-in Blast-loading
Finite element analysis
software

Subjects

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Journal of Structural and Construction Engineering
Volume 11, Issue 11 - Serial Number 88
February 2025
Pages 121-144

  • Receive Date 06 January 2024
  • Revise Date 09 April 2024
  • Accept Date 17 June 2024