# PARAM, SBTOLRTR

Bulk Data Entry Used to modify the tolerance value for symmetric beams when they are used for rotor modeling.

Parameter Values Description
SBTOLRTR <Real > 0.0>

Default = 1.0E-6 if parameter is not present in the model.

The tolerance value ( $val$ ) is used in the following checks:
Relative Tolerance for Bending Stiffness
$\frac{|E{I}_{yy}-E{I}_{zz}|}{\sqrt{E{I}_{yy}E{I}_{zz}}}\le val$
Tolerance for Shear Correction Factor
$|{k}_{y}-{k}_{z}|\le val$
Tolerance for Neutral Axis Location
$|{N}_{y}|,|{N}_{z}|\le val$ (at locations A and B)
Tolerance for Offset Vectors
$|{W}_{1}|,|{W}_{2}|,|{W}_{3}|\le val$ (at locations A and B)