Numerical Investigation of Shotcrete Retrofit for Enhancing the Blast Resistance of Reinforced Concrete Frames

Shahidzadeh, Mohammad Sadegh; Karami, Ehsan; Derakhshan Nezhad, Amir Hossein

doi:10.22059/ceij.2026.400767.2369

Numerical Investigation of Shotcrete Retrofit for Enhancing the Blast Resistance of Reinforced Concrete Frames

Articles in Press

Authors

¹ Assistant Professor, Department of Civil Engineering, Technical and Engineering Faculty, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

² Master's student in Civil-Structural Engineering, Technical and Engineering Faculty, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

³ M.Sc. in Civil Engineering – Structural Engineering, Department of Civil Engineering, Technical and Engineering Faculty, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

10.22059/ceij.2026.400767.2369

Abstract

Today, concrete buildings are resistant to fire, sound, and thermal pollution due to the availability of the required materials. Damping concrete buildings against dynamic forces is more than steel buildings. Therefore, by using appropriate retrofitting methods, these buildings can be optimally used in construction. In this research, a 4-story observation tower structure with the dimensions of 5×65 floors with a reinforced concrete bending frame system in three seismic zones with design accelerations of 0.25, 0.3 and 0.35 at distances of 10 and 20 meters and under Blast loading with 100, 200, 300 and 400 kg of TNT with and without reinforcement with shotcrete was modeled, loaded and analyzed in ETABS and ABAQUS software. The results showed that reinforcing the frame with shotcrete reduces the displacement and energy input to it. In fact, the shotcrete layer like a protector, absorbs the destructive effects caused by the explosion and reduces the damage caused by the force of the explosion on the frame. Reinforcement with shotcrete increases the structure's resistance and the amount of damage and destruction of the frame against to reduce the blast load, also increasing the blast distance reduced.

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