Numerical Investigation of Bundled RC Column under Impact Load

Table 1

Material properties for concrete and steel reinforcement.

Concrete
	Density (kg/m3)	Elastic modulus (GPa)	Poisson’s ratio (ν)	Compressive strength, fc (MPa)	Tensile strength, fctm (MPa)	Ultimate strain (%)
	2400	32.84	0.2	38	2.89	0.35
Steel reinforcement bars
	Density, ρ (kg/m^3)	Poisson ratio, ν	Elastic modulus, Es (GPa)	Yield stress, fy (MPa)	Yield strain, εy	Ultimate stress, fu (MPa)
Main bar	7850	0.3	200	500	0.0025	695
Stirrup	7850	0.3	200	460	0.0023	655