Prestressed & Post Tensioned Concrete in Scia Engineer

1. Prestressed & Post Tensioned Concrete in Scia Engineer Engineer Omar Alani Product Support Engineer Scia Engineer 12 May 2010

2. Overview of presentation Prestress Stages, TDA Posttensioning Conclusions 1

3. Input of geometry for 1D members 2 Css Boreholes Stirrups Reinforcement Strands

5. Indented wires

6. Strands

7. Plain round bars

9. The relaxation table is defined in the system database for each prestressed material.

10. The dialog and parameters are code and type (i.e. strand/wire/bar) dependent.

11. The diagrams of the relaxation values can be displayed,

13. Pre tensioned general parameters 6

14. Stressing bed manager 7 It is possible to define a number of stressing beds.

15. Geometry 8 Bore holes can easily be defined.

16. Geometry 9 Scia Engineer defines which bore holes are applicable. Defined holes Available holes

17. Geometry 10 Sectional strand patterns can easily be defined.

18. Geometry 11 Example of hollow core beam

20. Deformation of stressing bed

21. Elastic deformation of the joints of segmental structures sequentially prestressed

22. Steel relaxation

24. Shrinkage of concrete

26. 14 Example 1 Two span continuous beam are built in two construction stages: the left span in the first stage (assigned load case 1), and the second span in the second stage (assigned load case 2).

27. 15 Example 1 Both spans are prestressed and have a beam strand pattern defined. The left span contains 5 strands, the second one only one.

28. 16 Example 1 Tendon stresses for load case 1: In all tendons in the left beam In only one strand

29. 17 Example 2 Deformations Ux strand will shorten

30. 18 Example 2 Internal Forces Normal force

31. 19 Example 2 Stresses 3D stress diagram

32. 20 Example 2 Stresses Tendon stress

34. The user may prepare the shape of the tendon just once and later assign it to numerous beams.

37. Existing lines can be used to create tendons.

40. Absences are also possible.

43. Add or remove supports to the stage.

45. 29 Construction Stages Example 3 Situation A:

46. 30 Construction Stages Example 3 Situation B

47. 31 Construction Stages Example 3 Situation C

49. Green geometry is introduced in that particular stage.

51. 34 Construction Stages Example 4

54. 37 Construction Stages Example 4 The normal force for Class ST1 (ULS) The normal force for Class ST2 (ULS)

57. Each material used in the project can have its own E-modulus diagram.

58. The E-modulus diagrams can be assigned to all or just some materials used in the project.

59. The age at installation of each member can be defined.

61. The shrinkage

62. The thermal expansion. TDA can be used in conjunction with construction stage analysis Shrinkage nor thermal strains are stress-independent 40 Time Dependant Analysis TDA

64. All data set in the setup dialog is related to local time axis of relevant 1D member.

65. The origin of the local time axis (zero time) is set to the time, when the appropriate stiffness of macro is introduced into global stiffness matrix of the whole structure

66. The origin of local time axis is then located to global time of current construction stage. 41 Time Dependant Analysis Beam History

69. The following concrete checks can be carried out in Scia Engineer 44 1D elements Prestressed Concrete Calculations

70. Checking of limit strain (response) Strain Stress 45 Result examples 1D elements Prestressed Concrete Calculations

73. Other Examples Arbitrary Profiles Features in SciaEngineer: Prestressed 1Delements

74. Other Examples 49 PT Bridge

75. Other Examples PT bridge example

77. Internal and external tendons

79. Post tension: Bridge example

80. Post tension: PT slabs

81. 55 PT Slabs

82. PT shell elements 56

83. PT shell elements 57

84. 58 PT shell elements

85. Worked out customer example 59

86. Somereferencecustomers 60

87. 61 Conclusions Prestressing and post tensioning 1D and 2D elements Integratedsolution in one platform Easy to use interface WYSIWYG