now it is set ONLY in non linear simulations

Author: AlejandroCornejo

kratos.gid/apps/Structural/write/writeProjectParameters.tcl

@@ -90,8 +90,10 @@ proc ::Structural::write::getOldParametersDict { } {
     dict set solverSettingsDict material_import_settings $materialsDict
 
     # Solution strategy parameters and Solvers
-    # We now added this variable as true by default (in solids is mandatory)
-    dict set solverSettingsDict use_old_stiffness_in_first_iteration true
+    # We now added this variable as true by default (in nonlinear solids is mandatory)
+    if {[write::getValue STAnalysisType] eq "non_linear"} {
+        dict set solverSettingsDict use_old_stiffness_in_first_iteration true
+    }
     set solverSettingsDict [dict merge $solverSettingsDict [write::getSolutionStrategyParametersDict STSolStrat STScheme STStratParams] ]
     set solverSettingsDict [dict merge $solverSettingsDict [write::getSolversParametersDict Structural] ]