u4.42.04 Macro-command DEFI_CABLE_BP

Summary

The objective of this command is to calculate the initial tension profiles along the prestress cables of a concrete structure. The calculation data are the tension applied to the ends and other characteristic parameters of the anchors and materials. The relationships used are those prescribed by BPEL 91 or ETCC. It also makes it possible to create kinematic relationships between cable nodes and the concrete nodes in which it is immersed.

The cabl_precont concept produced can then be used:

• or by the operator AFFE_CHAR_MECA [U4.44.01] operand RELA_CINE_BP to define the mechanical loads linked to the presence of the cable (kinematic relationships and/or tension in the cables) .These loads will be taken into account by the operator STAT_NON_LINE [U4.51.03];

• or by the operator CALC_PRECONT [U4.42.05] for gradual tension of the cables and the possibility of phasing;

• or by the operator DEFI_GROUP (CREA_GROUP_NO/OPTION = “RELA_CINE_BP”) to create groups of nodes corresponding to the links created and to allow a visual verification of these kinematic relationships.

Produces a cabl_precont Data Structure.

• 1. Syntax
• 2. Operands
  • 2.1. Operand MODELE
  • 2.2. Operand CHAM_MATER
  • 2.3. Operand CARA_ELEM
  • 2.4. Operand GROUP_MA_BETON
  • 2.5. Definition of cable
  • 2.6. Operand ADHERENT
  • 2.7. Operand TYPE_ANCRAGE
  • 2.8. Operand TENSION_INIT
  • 2.9. Operand RECUL_ANCRAGE
  • 2.10. Choice of the type of calculation to take into account the relaxation of steels
  • 2.11. R_J operand
  • 2.12. Operand NBH_RELAX
  • 2.13. Keyword CONE
  • 2.14. Operand TITRE
• 3. Theoretical complement: estimation of tension losses in a prestress cable according to the requirements of BPEL
  • 3.1. Evolution of tension in the vicinity of the anchor
  • 3.2. Evolution of the tension beyond the length where the tension losses due to recoil at the anchor apply
• 4. Theoretical complement: estimation of tension losses in a prestress cable according to the requirements of ETCC
  • 4.1. Evolution of tension in the vicinity of the anchor
  • 4.2. Evolution of the tension beyond the length where the tension losses due to recoil at the anchor apply
• 5. example