6.2.1 Basic Properties

Next: 6.2.2 Tensile Behavior Up: 6.2 Total Strain Crack Previous: 6.2 Total Strain Crack Contents Index

Subsections

6.2.1 Basic Properties

DIANA can derive the basic properties for the Total Strain crack model from Model Code regulations for concrete. Alternatively, you may input the basic properties directly. The next sections describe these two input methods for basic properties.

6.2.1.1 Code Regulations

If you specify the following input, then DIANA derives the basic properties for the Total Strain crack model from code regulations for concrete. See §18.2.9 for background theory.

CEB-FIP Model Code 1990 (syntax)

$\begin{figure}\centering \begin{tabbing}\texttt{'MATERI'} \\ [-1.0ex] \rule{14.... ... \>\>\texttt{DMAX}\>\texttt{\textit{dmax}}$_{r}\,$ \end{tabbing} \end{figure}$

CONCRE: MC1990 indicates the European CEB-FIP Model Code 1990 [§18.2.9.1].
GRADE: grade specifies the concrete class, C20, C40, etcetera, where the numbers denote the specified characteristic compressive strength f_ck in MPa [Table 10.2].
DMAX: dmax is the maximum aggregate size of concrete [mm]. [ dmax > 0 ]

From this input DIANA derives the following basic properties: Young's modulus E , Poisson's ratio $\nu$ , tensile strength f_t , Mode-I fracture energy G_f^I , and compressive strength f_c . DIANA will overwrite any of these properties that you specified via direct input [§6.2.1.2].

(file.dat)

'MATERI'
   1  CONCRE MC1990
      GRADE  C60
      DMAX   32.0

6.2.1.2 Direct Input

With the following input you may specify the basic properties directly, instead of having them derived from a concrete Model Code.

(syntax)

$\begin{figure}\centering \begin{tabbing} \texttt{'MATERI'} \\ [-1.0ex] \rule{14... ...\>\texttt{USRPOI}\>\texttt{\textit{usrkey}}$_{w}\,$ \end{tabbing} \end{figure}$

YOUNG: e is the Young's modulus E .
POISON: nu is the Poisson's ratio $\nu$ . [ $\nu$ = 0 ]
THERMX: alpha is the thermal expansion coefficient $\alpha$ .
CONCEX: gamma is the concentration expansion coefficient $\gamma$ .

The required tensile and compression parameters depend on the applied tension softening [§6.2.2] or compression function [§6.2.4].

TEM $\sqcup$ $\sqcup$ $\sqcup$: influence by temperature: a1 to an are tempreatures T . The temperature-time dependency must be specified via input table 'TEMPER' [§1.2.1].
CON $\sqcup$ $\sqcup$ $\sqcup$: influence by concentration: a1 to an are concentrations C . The concentration-time dependency must be specified via input table 'CONCEN' [§1.2.2].
MAT $\sqcup$ $\sqcup$ $\sqcup$: influence by maturity: a1 to an are maturity variables M . The maturity-time dependency must be specified via input table 'MATURI' [§1.2.3].
PRE $\sqcup$ $\sqcup$ $\sqcup$: influence by pressure: a1 to an are pressures P . The pressure-time dependency must be specified via input table 'PRESSU' [§1.2.4].
$\sqcup$ $\sqcup$ $\sqcup$ YOU: influence on Young's modulus: e1 to en are the E values for the ambient values a1 to an.
$\sqcup$ $\sqcup$ $\sqcup$ POI: influence on Poisson's ratio: nu1 to nun are the $\nu$ values for the ambient values a1 to an.
TEMALP: influence by temperature on the thermal expansion coefficient: alpha1 to alphan are the $\alpha$ values for the temperatures a1 to an.
CONGAM: influence by concentration on the concentration expansion coefficient: gamma1 to gamman are the $\gamma$ values for the concentrations a1 to an.
USRYOU: Young's modulus determined via subroutine USRYOU [§11.1.1].
USRPOI: Poisson's ratio determined via subroutine USRPOI [§11.1.2].