Internal Variables > Creep/shrinkage/Relaxation

Internal variables calculated or temporarily assigned program internal values, which which - under a predefined name (not case-sensitive) - can be used as arguments for for evaluating user defined variables.

Setting

Description

Modification button

Values of internal variables can be temporarily changed for evaluating the influence on related user defined variables. The evaluation of all dependent user defined variables is performed immediately after switching to the variables presentation pad.

Creep / Shrinkage / Relaxation:

Variables used in the static or dynamic analysis Most of them used for defining the creep, shrink and relaxation behaviour

Setting	Description
t	Time history analysis: current point in time on the time axis Creep/shrinkage: concrete age of the considered element at the current point in time
t0	C&S: Concrete age of the considered element when loading was applied
ts	Only for shrinkage: Concrete age when the shrinkage process starts
tstart	Start time of the current action on the global time axis
E28	Young's Modulus for the material at 28 days (= calculation value)
Ax	The cross sectional area of the considered element
Fc28	Characteristic strength (cylinder strength) for the material at 28 days (used for the calculation of the creep coefficient according Norway Standard NS3473 and CEB90)
Fcub	Characteristic cube strength for the material after 28 days (used for the calculation of the creep coefficient according for some design codes)
CF	Consistency code of the concrete (used for creep analysis acc. CEB78 only)
U	Exposed outside perimeter of the element cross section
UIN	Inside perimeter of the element cross section
RH	Relative Humidity on site (long-term average value)
ZF	Cement hardening parameter of the current material (used for the calculation of creep coefficients acc. Norway Standard, CEB90, BS5400 and Hong Kong Standard)
TMP	The ambient temperature in the vicinity (long-term average value)
OMEGA	Current frequency (as angular velocity in rad/sec). Used for evaluating earthquake response spectra (abscissa value of the prescribed spectra)
GAMMA	Specific weight is needed for Norwegian code (creep and shrinkage)
WCR	Water cement ratio (used for calculation of creep coefficient according BS5400 and Hong Kong Standard)
CECO	Cement content in concrete (kN/m3) (used for calculation of creep coefficient according to BS5400 and Hong Kong Standard)
qlen	Evaluation of influence lines: length of the loaded sections
RPR	Stiffness ratio steel - concrete (used for calculation of creep coefficient and according to BS5400 and Hongkong Standard
RelSig	Relationship Sig-pr/SigRef, used for calculation of steel relaxation
RELCL	Relaxation class, used for calculation of steel relaxation
IQVAR	Control variable for variable load (load type QVAR)