Manual pages | Cast3M

$$$$ PREC     NOTICE  CHAT      11/09/12    21:17:42     7124           
                                             DATE     11/09/12

    Operateur PREC                           Voir aussi : BARR
    --------------                                  
      PRE1 =  PREC MODARM MATARM F1 (TAB1) |(MAIL1) | (PRE0) ;
                                           |( POIN1)|



    Description :                             
    ____________

    The PREC operator calculates the loss of prestress and build the 
    field of effective stresses on tendons fron initial tension applied
    one end of each tendon  belonging to the model .( model  BARR  or 
    ARMATURE BARR ) 
  


      Comments :
      __________


      MODARM : model object associated to the tendon (MMODEL type)

      MATARM : field of caracteristics associated to the tendon
               (MCHAML type, CARACTERISTIQUES subtype)

      F1     : value of the prestressing force applied to the
               end of the tendon (FLOTTANT type)
               
      MAIL1   support (MAILLAGE  of type POI1 elements) where tension
              tension  to be applied           

      POIN1  : If there is only one cable a point ( POINT TYPE) can be
              given instead of le above mesh 
        
      PRE0   : initial stress field (MCHAML type, CONTRAINTES subtype)
               (optional) 

      PRE1   : resulting stress field
               (MCHAML type, CONTRAINTES subtype)


     For losses of pre-stresses :
     
     TAB1    : table   whith the following arguments 
     
     
   For the loss of prestress by frottement :
  TAB1.'FF'    :  ratio of angular frottement (default 0.18 rd-1)
  TAB1.'PHIF'  :  ratio of linear frottement (default 0.002 m-1)

   For the loss of prestress at the anchoring point :
  TAB1.'GANC'  :  sliding at the anchoring point (default 0.0)

   For the loss of tensile stress of the tendon :

  TAB1.'RMU0': loss ratio of tensile stress of the tendon (default 0.43)
  TAB1.'FPRG': stress of warranted rupture (default 1700.e6 Pa)
  TAB1.'RH10': loss of tensile stress after 1000 hours in % (default 2.5 )  

   NOTA :
   
      the mesh of a sub model ( SEG2 type)  is mandatorily made of
      lines wtihout any branch 
      If Pre0 present , MODARM and MATARM are mandatorily those used
      to built Pre0 
      
      WHEN DEFAULT VALUES ARE USED UNITS MUST BE THE ONES NAMES ABOVE 
      
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