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PRE-Stress | Prestressed Concrete Design

PRE-Stress is an advanced software for calculations of prestressed concrete elements. The different stages from the casting in the factory to the final product in the building are considered. Cracking occurred in the early stages of the element lives on throughout the calculation, affecting the calculations in the final stages. The program is based on a 2D FEM-engine for accurate numerical solutions and precise results.

 

Features and benefits

  • Design most types of prestressed elements. Including rectangular beams, T-beams, hollow-cores, flange-beams, normal and sloped I-beams.
  • Quick overview over all stages with utilization curves or check the numerical results according to the current code.
  • Calculate according to national codes and Eurocode with country specific annexes.
  • Fast and accurate presentation for the whole life-span of prestressed concrete elements.
  • Fire-design of concrete elements according to EN1992-2 with complementary code EN1168 for hollow-core members.

 

Introduction video

  • Get an overview on how PRE-Stress works
  • Get an overview on how PRE-Stress can help you with your design

 

 

Training videos

In this training material we are showing the analysis and design of a prestressed concrete precast element, as well as fire calculations carried out in PRE-Stress 6.4. This video material included in the playlist is intended to be used along with a course material that can be found in the Documents section.

 

Strand Pattern Manager

Use the Strand Pattern Manager to load either a normal pattern-file or a master pattern file with all possible strand positions for a casting bed in a specific factory. The center of gravity for the cross section and the center of prestressing are shown to minimize any non-symmetrical deflection.

Recess beam design

After a successful code control, it is possible to design the recesses in the ends of the beam.

                                                                                     

Anchorage of prestressing strands

The design of anchorage reinforcement is performed if the section is cracked in the anchorage zone and the results will be shown along with any splitting, spalling and bursting reinforcement if needed.

Load combination generator

Load cases for dead loads are automatically generated for the element and any topping, if present. Depending on the type selected for the load, the program will automatically add the correct factors according to the national annex.

Safety classes have been added for appropriate annexes

In the Swedish annex the term 'Consequence Class' has been renamed to 'Safety Class'. It will still change the factors in the load combination if another safety class is chosen.

Splitting, spalling and bursting of concrete beams

PRE-Stress checks and designs are special end reinforcement stirrups with regard to splitting and spalling. You can select the diameter, cover, and spacing between the stirrups and the program will calculate the number of stirrups and how many legs are needed.

Concrete topping on hollowcore elements according to EN1168

For hollowcore members with active structural topping, it is possible to choose to calculate the Composite web shear capacity according to EN1168 Annex F.2.2, instead of the normal topping calculation according to EN1992-1-1 6.2.2.(2) or EN1168 4.3.3.2.2. This setting is enabled in the 'Calculation settings'-tab. Note that this method for calculating web shear failure only is valid for the simplified method in EN1168 4.3.3.2.2.3, and the program will automatically set this to prevent wrong assumptions. 

Fire Design

Fire design can be performed for concrete elements according to Eurocode 2, with complementary code EN1168 for hollow-core members.

User interface

PRE-Stress offers a graphical overview of all stages of the element.

Move the existing supports or add more in some stages of the construction.

With a tree explorer function it is easy to move between the stages and change the material and/or loads.

Situational Help&Theory-feature. Press F1 to show the help for the feature you are currently using.

 

 

Modelling/Elements

With 11 different basic cross section shapes and a dwg/dxf-import for hollowcore elements it is possible to define almost all of the common prestressed concrete cross sections. For more complex elements like rectangular beams with variable height (RBX), Sloped I-beams (SIB) and Sloped TT-elements (STT) there are modules for entering the geometry, and then with a possibility to save them as templates.

Can be used for prestressed filigree flooring and adding temporary supports during construction stage.

Define reinforcement with wizards, strand patterns or manually. Reinforcement can be entered as prestressed strands and/or normal reinforcement bars.

Design stirrups automatically with regards to shear and torsion.

 

 

Loads

Deadloads can be applied automatically. Point loads, line loads and trapezoidal loads can be entered with an optional eccentricity to be able to calculate torsion.

Apply topping in the correect phase as a wet concrete and it will harden into a structural topping in the next phases.

Fire loads are defined by fire time, exposed sides and material classes.

Apply creep and shrinkage in the different stages, while relaxation will be calculated automatically.

Define and customize your load combinations.

 

 

Analysis

Analytical results include graphical overviews for moment, torsion, shear force and deflection.

Tables for reaction forces, Max/Min-tables for M, V, T with regards to active load combination, equilibrium-table.

Non-linear calculations using non-linear material properties and cracked section analysis are performed by default.

 

 

Design

Design will be made according to Eurocode EN1992-1-1 with National annexes for:

  • Standard Eurocode
  • Denmark
  • Finland
  • Norway
  • Sweden
  • United Kingdom

For hollowcore elements, design of features in EN1168 is possible.

Fire design for hollowcore elements will be performed according to EN1168:2005+A3:2011, Annex G, all other elements will be designed according to EN1992-1-2.

Result of design will be shown graphically, in a quick overview and in detailed tables.

 

 

Reports

Detailed report with extended indata presentation, tables for each load combination, including results viable for serviceability limit state (SLS), ultimate limit state (ULS) and accidental limit state.

Calculations of eigenfrequencies are presented in the report.

Possibility to have overview printouts and reinforcement schematics.

 

 

Import/Export

Import of elements are supported from IMPACT Precast system (*.precastx-files)

It is possible to export results to IMPACT Production planner.

 

If you have any PRE-Stress related support questions, you can always contact our support team.

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Sweden, Worldwide
support.prestress@strusoft.com
+46 (0)40 530 191