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Solutions for Prestressed Reinforced Concrete Structures The state-of-the-art technology for the civil engineering world Prestressing Material Library When selecting a material from the library all properties are automatically defined Any property used for prestressing loss calculation can be easily modified Prestressed Concrete Structures Model Creation • The first step in the use of the Advanced Prestressed Concrete module is the model creation. The prestressing forces are applied later on in each one of these kinds of models: • Beam element model • Shell element model • Solid element model Prestressed concrete structures checking • ANSYS®+CivilFEM® includes the Checking and Design of hyperstatic prestressed concrete structures, taking into account shear and torsion effects, conforming to the following codes: • Eurocode 2 • ACI • EHE Prestressed structures • The calculation of prestressing losses distinguishes between Pre-tension and Post-tension structures. • Therefore, for the Pre-stressed structures, CivilFEM incorporates, for example, the reinforced thermal expansion due to the heating process, in addition to the pull-in losses and elastic concrete deformation, long-term losses (creep and shrinkage, etc) 3D Tendon Geometry Editor • It allows the definition and edition of the geometric and strength properties of all tendons of a structure. The geometry may be shown and edited either graphically or by coordinates Tool Bar Object Tree Elevation View Info/Edit Window Plan View 3D Tendon Geometry Editor • It is possible to visualize the corresponding cross section and the location of the tendons along the structure. 3D Tendon Geometry Editor • Graphical visualization of all prestressing losses for each tendon along the structure. Prestressed Concrete Module 1 ELEMENTS MAT JAN NUM 7 2004 13:54:12 • From this version v12, it is possible to define tendons with complex geometry without using the support beam Y Z X Prestressing Losses • The prestressing loss calculation allows to obtain the instantaneous and the long-term prestressing losses for the tendons defined within the CivilFEM tendon editor. • Instant losses: P1, P2, P3, Px • Friction losses (P1) 2 P0 1 1 2 3 x Friction losses P = P - P 3 x 0 1 Prestressing Losses • Pull-in Losses (P2) P w P0 P1 (x) Sp (w) P (max) 2 P (x) Jack force 2 Loss due to the pull-in of weges P(x) = P0 - P1 (x) Anchored end x Loss due to pull-in (theoretical approach) • Elastic concrete deformation (P3) • Others (Px) Prestressing Losses • Apart from the instantaneous losses, the program also calculates the following long-term losses: • Concrete shrinkage (P4) • Concrete creep (P5) • Steel relaxation (P6) Prestressing Losses • The tendon properties and the calculated losses can be listed in an HTML document. List Calculate losses View Results Prestressing Losses • User Defined Prestressing Losses Reads the prestressing losses from a file 2D/3D Deviation Forces • CivilFEM calculates the deviation forces produced by the prestressing tendons on any 2D or 3D solid or beam structure defined in ANSYS®. • The deviation forces are defined as a specific load set automatically located on nodes and/or distributed on the elements. Prestressed Forces and Moments • Both isostatic and hyperstatic effects corresponding to Prestressing actions are calculated 1 Y 11 Z 1 Y 11 Z X ANSYS 8.0 FEB 19 2004 10:07:19 PLOT NO. 16 LINE STRESS STEP=1 SUB =1 TIME=1 CFETAB_ICFETAB_J MIN =-.101E+08 ELEM=19 MAX =.173E+08 ELEM=37 -.101E+08 -.707E+07 -.402E+07 -984594 .206E+07 .510E+07 .814E+07 .112E+08 .142E+08 .173E+08 X 1 Y 11 Z X ANSYS 8.0 FEB 19 2004 10:07:19 PLOT NO. 17 LINE STRESS STEP=1 SUB =1 TIME=1 CFETAB_ICFETAB_J MIN =-.203E+08 ELEM=31 MAX =.738E+07 ELEM=25 -.203E+08 -.173E+08 -.142E+08 -.111E+08 -.802E+07 -.494E+07 -.186E+07 .122E+07 .430E+07 .738E+07 ANSYS 8.0 FEB 19 2004 10:07:19 PLOT NO. 18 LINE STRESS STEP=1 SUB =1 TIME=1 CFETAB_ICFETAB_J MIN =-.869E-06 ELEM=50 MAX =.116E+08 ELEM=37 -.869E-06 .129E+07 .257E+07 .386E+07 .515E+07 .643E+07 .772E+07 .901E+07 .103E+08 .116E+08 Prestressed Forces & Moments • Stresses in the support and in the middle of span. Checking of Prestressed Structures • Serviceability Limit State • Checking of cracking according to codes taking into account the prestressing cables Checking of Prestressed Structures • Ultimate Limit State (Axial+Bending checking) Other Utilities • Although the prestressed utilities are mostly focused on bridge calculation, it’s also possible to make use of them in other kind of structures such as prestressed slabs, silos, etc Prestressed Concrete Structures Other Projects • A group of loads, equivalent to the effect of the prestressing tendons will be created on the model and transferred to its nodes. • This method can be applied to any kind of model or mesh (even on a model made up of beam elements) Prestressed Concrete Structures Other Projects Prestressed Concrete Module