B.1.1 Concrete

Via the Concrete concept you may specify predefined concrete classes [§10.1]. Via subconcepts you may specify the code, class and other topics.

B.1.1.1 Dutch Code

The NEN 6720 concept indicates concrete according to the Dutch code [§10.1.1]. You must choose a class B n [Table 10.1], and indicate the analysis type Linear or Nonlinear . This requires the specification of the following parameters.

Thermal expansion coefficient	$\alpha$	THERMX	alpha	§4.1.1
Poisson's ratio	$\nu$	POISON	nu	§4.1.1
Mass density	$\rho$	DENSIT	rho	§3.1.1
Young's modulus	E	YOUNG	e	§4.1.1

For a nonlinear analysis you must further indicate the type (Static , Time dependent , or both), the applied phenomena (Creep , Shrinkage or both), and the cement class (A , B , or C ). Depending on the specified concepts iDIANA shows the predefined values for the various properties. Note that you still have to fill in some non-predefined values.

Nonlinear
Tensile strength	ft	TENSTR	ft	§6.2.1.2
Compressive strength	fc	COMSTR	fc	§6.2.1.2
Shear retention factor	$\beta$	BETA	beta	§6.2.3

Creep		CREEPN	NN6720	§7.4.2.3
Young's modulus at 28 days	E28	YOUN28	e28	§7.4.2.3
Charac. strength 28 dys (MPa)	fck	FCK28	cstren	§7.4.2.3
Notational size (mm)	h	H	notsiz	§7.4.2.3
Concrete age at loading (dys)	tlo	LODAGE	tlo	§7.4.2.3
Relative ambient humidity (%)	RH	RH	humid	§7.4.2.3

Shrinkage		SHRINN	NN6720	§8.2.2
Lowest reinforcement %	$\bar{{\omega}}_{{0}}^{}$	OMEGA	reinpe	§8.2.2
Concrete age end curing (dys)		CURAGE	ti0	§8.2.2

B.1.1.2 European Code

The CEB-FIP concept indicates concrete according to the European code [§10.1.2]. For this code you must first choose Plain or Reinforced/prestressed concrete , then the concrete class C n [Table 10.2], followed by the analysis type Linear or Nonlinear . This requires the specification of the following parameters.

Thermal expansion coefficient	$\alpha$	THERMX	alpha	§4.1.1
Poisson's ratio	$\nu$	POISON	nu	§4.1.1
Mass density	$\rho$	DENSIT	rho	§3.1.1
Young's modulus	E	YOUNG	e	§4.1.1

For a nonlinear analysis you must further indicate the type: Static , Time dependent , or both. You must also choose a crack model: Total Strain fixed crack or Total Strain rotating crack [§18.2.1]. For the creep model [§7.4.2.1] you must indicate the cement type (Slowly hardening , Normal and rapidly hardening , or Rapidly hardening for high strength cement) and also the application of aging (Concrete age - loading days , or Concrete age to be generated for aging chains). Finally you must indicate the application of Shrinkage [§8.2.2] or No shrinkage . Depending on the specified concepts iDIANA shows the predefined values for the various properties. Note that you still have to fill in some non-predefined values.

Nonlinear
no parameters

Total strain fixed crack		TOTCRK	FIXED	§6.2
Tensile strength	ft	TENSTR	ft	§6.2.1.2
Compressive strength	fc	COMSTR	fc	§6.2.1.2
Shear retention factor	$\beta$	BETA	beta	§6.2.3.1
Maximum aggregate size		DMAX	dmax	§6.2.1.1

Total strain rotating crack		TOTCRK	ROTATE	§6.2
Tensile strength	ft	TENSTR	ft	§6.2.1.2
Compressive strength	fc	COMSTR	fc	§6.2.1.2
Maximum aggregate size		DMAX	dmax	§6.2.1.1

Creep & Shrinkage		CREEPN	MC1990
Young's modulus at 28 days	E28	YOUN28	e28	§7.4.2.1
Mean comp str 28 days (MPa)	fcm	FCM28	fcm28	§7.4.2.1
Notational size (mm)	h	H	notsiz	§7.4.2.1
Relative ambient humidity (%)	RH	RH	humid	§7.4.2.1
Ambient temperature (C)	Tenv	TEMPER	tenv	§7.4.2.1
Concrete age at loading (dys)	tlo	LODAGE	tlo	§7.4.2.1
Age at element birth (days)	tel	AGING	tel	§7.4.2.1
Concrete age end curing (dys)		CURAGE	ti0	§8.2.2