m - Material properties

The following material types (material models) are implemented in jconc :

Material type	Optional values	Comments
concrete	none	Concrete has no tensile strength and the compressive strength defined above. The effective strength is function of the strain state in the concrete according to the formulation of the modified compression field theory.
		To model linear-elastic concrete, use steel as material type, with very large value for the yield strength.
	β 1, β 2	β 1 and β 2 are the coefficients for the calculation of the strength reduction factor accounting for transverse cracking. They are implemented as Default values correspond to those of the MCFT (β 1 = 0.8 and β 2 = 170)
steel	none	Steel is elastic up to the indicated strength in tension and in compression, and subsequently has a small numerical strain hardening modulus of E / 10’000.
		To model linear-elastic steel, input a very large value for the strength.
	Ehard	Modulus of strain hardening Ehard : describes the behaviour of steel beyond its strength. May also be input as a negative value.
steelLinSoft	Ehard (typically Ec / 10'000)	Pseudo-reinforcement to account for the fracture energy of concrete cover. Add as bar elements in areas where spalling occurs. Area of the elements is to be that of the cracked spalling area. Material strength (3rd parameter above) is in this case defined as 73 · fcm0.18 / wlim, where wlim is the width of the spalling crack at failure. If the crack width is not available, material strength should be assumed equal to between 0.1 · fctm and 0.2 · fctm, where fctm is the mean tensile strength of concrete
cable	sigma_0	Required sigma_0: initial stress in the prestressing tendon.
	sigma0, Ehard	sigma_0: see above. Ehard: modulus of strain hardening defines the behaviour beyond the yield stress of the steel.
concWithfct	fct	Required: tensile strength of concrete fct.
tensOnly	none	Tension-only material (like steel).
		To model a purely elastic tension-only spring, input a very large value for the strength.
	Ehard	Ehard: Modulus of strain-hardening in tension.
compOnly	none	Compression-only material (like steel).
		To model a purely elastic compression-only spring, input a very large value for the strength.
	Ehard	Ehard: Modulus of strain-hardening in compression.