6.2.3 Shear Behavior

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Subsections

6.2.3 Shear Behavior

For the Total Strain Fixed crack models, DIANA explicitly evaluates the shear retention behavior [§18.2.6]. You must specify this behavior according to the following syntax.

(syntax)

$\begin{figure}\centering \begin{tabbing} \texttt{'MATERI'} \\ [-1.0ex] \rule{14... ...s\;\)\hspace{14ex}\=\emph{shear retention parameters} \end{tabbing} \end{figure}$

SHRCRV: curve is the name of the predefined shear retention function. There are models for constant shear retention [§6.2.3.1], and for variable shear retention [§6.2.3.2].

6.2.3.1 Constant Shear Retention

Constant shear retention may be applied for the Total Strain Fixed crack models.

(syntax)

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

CONSTA

for a constant shear retention curve after cracking [Fig.6.5].

**Figure 6.5:** Constant shear retention for Total Strain crack models
$\begin{figure}\begin{footnotesize}\setlength{\unitlength}{1cm} \begin{picture... ...enterline{\raise 2.7cm\box\graph} } \end{picture}\end{footnotesize} \end{figure}$

BETA

beta is the shear retention factor $\beta$ [ $\beta$ = 0.01 ] of the constant shear retention function.

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].

$\sqcup$ $\sqcup$ $\sqcup$ BET

influence on the shear retention factor: beta1 to betan are the $\beta$ values for the ambient values a1 to an.

USRBET

shear retention factor determined via subroutine USRBET [§11.3.8].

6.2.3.2 Variable Shear Retention

The shear behavior during cracking can be described via a shear retention model. For the Total Strain Fixed crack model, you may either define a constant shear retention model [§6.2.3.1], or a variable shear retention model. DIANA offers two multi-linear variable shear retention models, respectively based on shear stresses and shear strains, and on shear retention and shear strains.

Multi-linear shear stress-strain (syntax)

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

MULTLN: for a multi-linear diagram between shear stresses and shear strains.
SHRPAR: are the points of the multi-linear diagram: n pairs of values ( $\tau$ , $\gamma$ ); ( 1 $\leq$ n $\leq$ 100 )tau0 ...taun are the shear stresses $\tau$ , gam0 ...gamn are the corresponding shear strains $\gamma$ .

Multi-linear shear retention-strain (syntax)

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

BEDIAG: for a multi-linear diagram between shear retention and shear strains.
SHRPAR: are the points of the multi-linear diagram: n pairs of values ( $\beta$ , $\gamma$ ); ( 1 $\leq$ n $\leq$ 30 )bet0 ...betn are the shear retention factors $\beta$ , gam0 ...gamn are the corresponding shear strains $\gamma$ .

Next: 6.2.4 Compressive Behavior Up: 6.2 Total Strain Crack Previous: 6.2.2 Tensile Behavior Contents Index

DIANA-9.3 User's Manual - Material Library
First ed.

Copyright (c) 2008 by TNO DIANA BV.