PSI - Issue 82

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 82 (2026) 30–36

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Abstract This study focuses on the numerical simulation of concrete fracture in steel concrete composites under blast loading caused by the deflagration of nitromethane. The simulation employs 3D dynamic nonlinear finite element analysis. The analysis method is based on a novel poro-mechanical approach to analyze blast induced fracture in concrete considering gaseous kinetics through cracks. The experimental findings obtained on two specimens presented in previous research were utilized as a reference of verification and validation of the simulation. The study investigates the crack network development, the influence of pressurized gas, stress level in the stud dowels and in the steel girder and verifies its findings experimentally. The study shows that the numerical simulation successfully reproduces the kinetics of the experiments. Reduced dowel spacing causes high pore pressure rise due to a strong confinement against crack propagation in concrete media. Stud dowel configuration and cartridge count affect fracture behaviors. Both the stud dowels and steel girder remained undeformed, supporting their reuse. © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Keywords: Explosion; steel concrete composites; fracture; simulation 1. Introduction As many surface and underground structures approach the end of their service life, efficient demolition methods are increasingly necessary. While blasting with explosives enables rapid demolition, it remains largely experience- Abstract This study focuses on the numerical simulation of concrete fracture in steel concrete composites under blast loading caused by the deflagration of nitromethane. The simulation employs 3D dynamic nonlinear finite element analysis. The analysis method is based on a novel poro-mechanical approach to analyze blast induced fracture in concrete considering gaseous kinetics through cracks. The experimental findings obtained on two specimens presented in previous research were utilized as a reference of verification and validation of the simulation. The study investigates the crack network development, the influence of pressurized gas, stress level in the stud dowels and in the steel girder and verifies its findings experimentally. The study shows that the numerical simulation successfully reproduces the kinetics of the experiments. Reduced dowel spacing causes high pore pressure rise due to a strong confinement against crack propagation in concrete media. Stud dowel configuration and cartridge count affect fracture behaviors. Both the stud dowels and steel girder remained undeformed, supporting their reuse. © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Keywords: Explosion; steel concrete composites; fracture; simulation 1. Introduction As many surface and underground structures approach the end of their service life, efficient demolition methods are increasingly necessary. While blasting with explosives enables rapid demolition, it remains largely experience- Abstract This study focuses on the numerical simulation of concrete fracture in steel concrete composites under blast loading caused by the deflagration of nitromethane. The simulation employs 3D dynamic nonlinear finite element analysis. The analysis method is based on a novel poro-mechanical approach to analyze blast induced fracture in concrete considering gaseous kinetics through cracks. The experimental findings obtained on two specimens presented in previous research were utilized as a reference of verification and validation of the simulation. The study investigates the crack network development, the influence of pressurized gas, stress level in the stud dowels and in the steel girder and verifies its findings experimentally. The study shows that the numerical simulation successfully reproduces the kinetics of the experiments. Reduced dowel spacing causes high pore pressure rise due to a strong confinement against crack propagation in concrete media. Stud dowel configuration and cartridge count affect fracture behaviors. Both the stud dowels and steel girder remained undeformed, supporting their reuse. © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers Keywords: Explosion; steel concrete composites; fracture; simulation 1. Introduction As many surface and underground structures approach the end of their service life, efficient demolition methods are increasingly necessary. While blasting with explosives enables rapid demolition, it remains largely experience- 8th International Conference on Structural Integrity and Durability (ICSID2025) A numerical analysis of blast-induced dynamic fracture in steel concrete composite structures Addisu Bonger a, *, Akira Hosoda b , Koichi Maekawa c , Stanislav Zaˇzirej b a Sumitomo Mitsui Construction Co.,LTD., Research and Development Institute, 518-1 Komagi, Nagareyama 270-0132, Japan b Yokohama National University, Institute of Urban Innovation, 79-5 Tokiwadai, Hodogaya 240-8501, Japan c Yokohama National University, Institute of Multidisiplinary Sciences, 79-5 Tokiwadai, Hodogaya 240-8501, Japan 8th International Conference on Structural Integrity and Durability (ICSID2025) A numerical analysis of blast-induced dynamic fracture in steel concrete composite structures Addisu Bonger a, *, Akira Hosoda b , Koichi Maekawa c , Stanislav Zaˇzirej b a Sumitomo Mitsui Construction Co.,LTD., Research and Development Institute, 518-1 Komagi, Nagareyama 270-0132, Japan b Yokohama National University, Institute of Urban Innovation, 79-5 Tokiwadai, Hodogaya 240-8501, Japan c Yokohama National University, Institute of Multidisiplinary Sciences, 79-5 Tokiwadai, Hodogaya 240-8501, Japan 8th International Conference on Structural Integrity and Durability (ICSID2025) A numerical analysis of blast-induced dynamic fracture in steel concrete composite structures Addisu Bonger a, *, Akira Hosoda b , Koichi Maekawa c , Stanislav Zaˇzirej b a Sumitomo Mitsui Construction Co.,LTD., Research and Development Institute, 518-1 Komagi, Nagareyama 270-0132, Japan b Yokohama National University, Institute of Urban Innovation, 79-5 Tokiwadai, Hodogaya 240-8501, Japan c Yokohama National University, Institute of Multidisiplinary Sciences, 79-5 Tokiwadai, Hodogaya 240-8501, Japan ˇ

* Corresponding author. Tel.: +81-50-3085-3915; fax: +81-4-7140-5020. E-mail address: b-addisu@smcon.co.jp * Corresponding author. Tel.: +81-50-3085-3915; fax: +81-4-7140-5020. E-mail address: b-addisu@smcon.co.jp * Corresponding author. Tel.: +81-50-3085-3915; fax: +81-4-7140-5020. E-mail address: b-addisu@smcon.co.jp

2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers 2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers 2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID organizers 10.1016/j.prostr.2026.04.006