Abstract
Different factors can affect blast response of structural components. Hence, experimental tests could be the best method for evaluating structures under blast loading. Therefore, an experimental explosion loading has been done on RC members by the authors. Four RC components, with identical geometry and material, with and without axial load were imposed to air blast. Observed data of the members’ response under blast loading was used for validation of finite element modeling process using ABAQUS software. With respect to complexity, limitations, and high costs of experimental tests, analytical studies and software modeling can be good alternatives. Accordingly, in this paper, the behavior of 6 different models of normal and strengthened RC columns under blast loading was evaluated using ABAQUS. Strengthening configurations considered here were designed for enhancing axial capacity of RC columns. Therefore, we can investigate the effectiveness of axial strengthening of column on its blast resistance capacity and residual axial strength. The considered strengthening methods were different steel jacket configurations including steel angle, channel, and plate sections. The results showed that retrofitting significantly improves blast performance of the columns. Moreover, residual strength capacity of the columns strengthened with steel channel is higher than the other models.
Highlights
A wide range of engineering structures such as high-rise buildings, bridges, tunnels, dams, platforms, and military and security shelters are constructed by reinforced concrete materials
Shi et al (2008) defined a failure criterion based on residual axial capacity for reinforced concrete columns and drew PI diagrams for columns based on this failure criterion using numerical modeling by LS-DYNA software [8]
The performance of simple and steel jacket strengthened reinforced concrete columns has been evaluated under the effect of blast transverse loading
Summary
A wide range of engineering structures such as high-rise buildings, bridges, tunnels, dams, platforms, and military and security shelters are constructed by reinforced concrete materials. ABAQUS/Explicit software has been used in finite element modeling by Arlery et al (2013) on effects of close explosion on reinforced concrete columns [10]. Crawford (2013) reported some of the methods of using FRP for strengthening RC columns in order to increase the strength of RC columns under the simultaneous effect of blast loading and axial force [6]. According to the main results, FRP coating increases the ductility and shear strength of the column The focus in these studies was based on FRP material and other methods for retrofitting RC columns were not considered. The effect of retrofitting reinforced concrete beams and columns using SRP coating has been evaluated using explosion tests and numerical modeling by AUTODYN. We can investigate the effectiveness of axial strengthening of the RC columns by steel jackets on their blast resistance capacity
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