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Solomon Abebe
Finite Element Analysis on Reinforced Concrete Column Prone to Explosion Effects
Abstract
The need for assessing and retrofitting of structures has increased with time as terrorism induced explosion trends rise with time. Despite this, there are limited manuals and studies on structures under accidental loads. This paper investigates the dynamic response of a reinforced concrete framed building column prone to explosion effects. An explicit 3D nonlinear FEA packaged computational program ANSYS AUTODYN was used to simulate the explosion event. The efficiency of the FEA model was proven by comparing the numerical model results with experimental test obtained from recent literature. By varying explosive charge masses, scaled distances, cross-sectional geometries, and transverse reinforcement details, a parametric study was carried out by extracting the peak displacement, effective plastic strain and damage index values. FEA result revealed that for a given close-in explosion event, a decrease in scaled distance increases the peak displacement, effective plastic strain and damage index values. Moreover, for close-range scaled distances, circular columns, when compared with square columns, the former one tremendously minimizes the peak displacement and effective plastic strains up to an average percentage value of 78.54% and 62.27% respectively. When compared to other transverse reinforcement detailing schemes, simultaneous use of a square four-leg tie which encloses the entire perimeter of the column and a 45° oriented diamond shaped ties made the core of concrete in the intact mode and significantly drops the damage indices up to a percentile average value of 28.2%.
Keywords: EBCS EN, Explosion, Finite element analysis, Reinforced concrete column, Scaled distance