Calculation Program for the design and check of prestressed beams, both pre- and post- tensed, with any symmetric section geometry and with constant heigh

Calculation according to Eurocode 2 UNI EN 1992-1-1 version 2005 and Italian NTC 17-01-2018.

The program verifies and checks iteratively prestressed beams of sections that are symmetrical respect to the vertical axis. The beams may have a streamlined section (equal along the whole length), or can have the different shape of the ends. The sections can be hollow, with one or more holes (for hollow-core slabs and asymmetric beams we have specific modules here and here respectively).

Beams are simply supported and they can have Overhangs at the ends. User can add CAST IN PLACE, to support loads, even with complex shape. The program will homogenize the cast in place to the beam, taking into account the different strengths of the concrete.

calcolo travi precompresse pretese e post-tese


  • PRE- and POST- tensed beams
  • Beams of any simmetric sections
  • Different section on ends
  • Results are evidenced for a faster and easier reading
  • Technical support and updates included
  • Always updated to the new Rules

The program verifies and checks iteratively prestressed beams of sections that are symmetrical respect to the vertical axis, according to Eurocode 2 UNI EN 1992-1-1 : 2005 and Italian NTC2018.

Constantly updated to the newest Regulations

The verification is made in a serie of sections with constant step along the whole beam lenght + the first prestressed section + the most stressed section for bending + the last prestressed section.

The program will also verify the transitional phases: the draft, lifting, lifting / transport after a storage period

The losses of tension are calculated in the centre of gravity of the strands contained in the lower 2/3 of the beam. The calculation at limit states is executed in an exact manner based on diagrams of breakage of the strands supplied by the manufacturer of the strands.

In each section the programs checks main traction and compression sigmas on the centre of gravity and shows the minimum distance where the stirrups should be placed.  Superior and inferior reinforcement is always calculated, to absorb the tractions as requested from Regulations.

There is the possibility to calculate any section chosen from the user, with the control of main tau and sigma of traction on the whole height of the section.

LOCAL VERIFICATION (Check of the load on a projecting tooth + Check of tooth and suspension + Check suspension only)

Check of the load on a projecting tooth Enter the geometric data of the tooth and the load on it (on one of the two sides) with the WIDTH of its footprint. The program takes into account the distribution of the load and it shows the required stirrups.

Check of tooth and suspension. If the tooth is on the lower side of the beam (as it happens in the large majority of cases) there is an effect of suspension associated with the action of the load on the tooth, then in addition to the check of "TOOTH" we must add the check on "SUSPENSION" . The program automatically inserts a double load than that on the tooth, since the suspension is viewed by the program as an agent on both sides of the beam web. The spread of the load is calculated for the tooth. The stirrup area for suspension is compared to that required by the calculations of the beam and the program prints the larger of two.

Shear Verification in the not-prestressed section on support, following the method “variable strut inclination method”

Display of Constraint reactions Rare and Ultimate left and right (also shown in the calculation report).

USE DIAGRAMS research of the span-capacities diagram, given a certain reinforcement

Verification of overhang support
Verification in partial prestress


Verification of GERBER SUPPORT


SNOW-WIND LOADS for each Italian location for any load situation.




Parametric Autmatic sections
Automatic calculation of all the geometrical characteristics

The beam can have CAST IN PLACE and POINT LOADS. User can input piece of rebars in any point of the beams

Editing of a database of the most used roof elements for the automatic calculation of G1, so that the user doesn’t need to look through weight tables each time

Input of loads on beam using  m2 or m, user choice

Reports and tables can be exported as: DOC, RTF, PDF, HTML
Fast check or results with highlight of eventual values over the limits of the Rules, any values NOT verified are indicated in red, while the values shown in blue are the values within the limits
Graph of the minimal needed area of stirrups along the whole beam
Easy and graphic management of strands, rebars and sheaths.

Handy starting menu
Settings of defaults data can fasten the inputs of the most used configurations of beams
For users that works for more companies, it is possible to save all the default data and the parameters depending on the Company in "Criterions", so that it is easier and fast to switch from a job to another without worring about all settings. For example., it is possible to save any number of lifting ans transportation schemas.
It is possible to switch from one section to another for the verification in a few seconds and immediately see if it is satisfied or not.

SCHEME OF THE BEAM: in every moment current section, cast in place if present, rebars, pre+post tensed strands and calculation results are displayed to always keep the situation under control.

FREE ADD-INS FOR ALL PROGRAMS engineers can easily and quickly make daily calculations

  • CALCULATION OF THE REBARS AREAS (for one or more rebars, to add them and to calculate the rebar area/m)
  • SNOW-WIND LOADS for each Italian location for any load situation.

Lots of enhancements are made according to customer request
Available Languages : Italian, English, Spanish

input dati

trave precompressa

input dati trefoli

verifica sella gerber

verifica sismica

input fly

input tegolo tt

input trefoli post tesi

trave con foro


The PREF program is a suite of modules for the calculation of prestressed beams of various gometry which is distributed on an annual subscription basis.

The subscription can be customized, choosing the modules of your interest, and includes the use of the programs, technical assistance and all the updates that will be released.

To reactivate a subscription, simply send us an email request, specifying whether the programs to be included in the package are the same or if you want to change them, you will be sent a quote for the new subscription.  

The licensing and updating mode of Eiseko programs has undergone changes: the protection key will no longer be usable. With the new system, you will be able to manage your online license using login credentials.
We invite you to contact us in order to make an appointment. You will be assisted remotely during the installation.

Per poter installare il software la invitiamo a:

  1. Scaricare il file di installazione tramite il seguente link: PREF_-_INSTALLAZIONE
  2. Avviare l'eseguibile e seguire i passaggi
  3. Sul desktop viene creata una icona. Fare doppio click per lanciare il programma
  4. Inserire la mail fornita al momento dell'acquisto e cliccare su Reset PasswordLogin PREF
  5. Una volta ricevuta la password via mail, inserirla nel campo e cliccare su Login
  6. I software acquistati risulteranno attivi

 La invitiamo a contattarci per poter fissare un appuntamento. Verrà assistito da remoto durante l'installazione.

Dopo aver effettuato il Login, cliccare sull'icona "Controlla Aggiornamenti"

Controlla Aggiornamenti

Se sono disponibili aggiornamenti, cliccare sull'icona indicata in seguitto per effettuare il download.

Download Aggiornamento

Seguire le istruzioni per l'installazione. Se disponibili aggiornamenti per più programmi, ripetere le precedenti operazioni.

Ora tutti i programmi sono Aggiornati


There are pros and cons in both cases, the choice is very personal, but we recommend working on files.

If you work with file, you can save the file wherever you want, on the local PC or on the network (for example in the job order folder). When you create a new file of the project with the calculation program, you will have to manually select the text file of the section (created with the Geometries module) from the folder in which it was saved in. If you work on files it is good habit to make a backup of the project txt files in order not to lose the work you've done.

If you work with database you have all the beams (created with the Geometries program) and the projects (created with the calculation program) saved in the same file, whose management is automatic by the program and you don't have to worry about where you save it (you can see name and path of the file in the "Information" menu). The list could become very long. Anyway, you can do all the operations of saving multiple databases, using databases on the network, changing databases.

If you are working with a  database you need to remember to make a backup of the mde / mdb files you used. The files must be saved in a folder on the PC where the user has all access privileges (modification and saving), we recommend C:\Users\Public\Public Documents\Eiseko Database (folder created by default with the installation of the program).

In the menu at the top right select "Data Input", "CompanyData"

Enter the desired data and press "Save".

In the menu at the top right select "Data input", "User data"

Enter the desired data and press "Save".


Yes, it is possible. It must be done BEFORE creating all the projects belonging to a specific job order.

From the main form, press “SETTINGS” and then “SET SEISMIC PARAMETERS”.
It will open then following window, in which it is possible to associate all the seismic data relating to the location of the selected job.

Each time a new project associated with the “Example” job is created, the program will automatically propose the data of the seismic parameters (they will obviously be modifiable).
NOTE: projects that already existed before these parameters are set will continue to use the previously saved data.


Nella finestra SETTAGGI della finestra iniziale si può impostare il tiro del banco trefoli.


Qua premere MODIFICA

TRAVI RTL CALCOLO TRAVI PRECOMPRESSE - impostazione del tiro massimo per il banco di tiro

Qua selezionare la scheda IMPOSTAZIONI TIRO

TRAVI RTL CALCOLO TRAVI PRECOMPRESSE - impostazione del tiro massimo per il banco di tiro

Quindi premere il pulsante arancione  SETTAGGI DEFAULT

TRAVI RTL CALCOLO TRAVI PRECOMPRESSE - impostazione del tiro massimo per il banco di tiro

Il programma RTL dà un messaggio di errore se il tiro trefoli complessivo supera i limiti imposti in “Impostazioni Tiro”.
Se si hanno a disposizione i valori del prefabbricatore si possono impostare quelli, la quota di riferimento Q.R. è spiegata, basta premere il pulsante "Vedi immagine", in alto a destra, e si ottiene questa finestra descrittiva.

TRAVI RTL CALCOLO TRAVI PRECOMPRESSE - impostazione del tiro massimo per il banco di tiro

I prefabbricatori hanno il progetto delle testate di tiro dei loro banchi di casseri.
Le testate sono delle strutture vere e proprie in calcestruzzo od acciaio a cui vanno appoggiati i martinetti durante la tesatura e a cui vanno fissati i trefoli prima di effettuare il getto delle travi nei casseri. Le testate devono reggere il tiro complessivo fino all’atto del taglio o del rilascio dei trefoli.
Il progettista delle testate le ha dimensionate in funzione di un tiro massimo dei trefoli variabile in altezza riferito ad una quota che stabilisce lui, che in genere è il piede dei contrafforti.

Si riporta uno schema indicativo.

TRAVI RTL CALCOLO TRAVI PRECOMPRESSE - impostazione del tiro massimo per il banco di tiro

Se non si hanno i valori del prefabbricatore si possono impostare dei valori a caso sufficientemente alti, per esempio Dist. Da Q.R. = 200 cm e Tiro = 1000 ton.

Si procede con: Elimina tutto, si impostano i valori e poi si procede con Aggiungi, Elimina Riga.

Si riporta un  esempio

TRAVI RTL CALCOLO TRAVI PRECOMPRESSE - impostazione del tiro massimo per il banco di tiro

Tutti i “dati di default”, in gruppo, possono essere memorizzati in diversi “CRITERI”: ad es, se un ingegnere lavora per più ditte, può memorizzare i dati di default validi per le diverse ditte in più criteri ciascuno con il nome della ditta. Prima di creare il nuovo progetto scegliere il Criterio della ditta per cui si realizza il progetto di calcolo. L’uso dei “Criteri” si dimostra particolarmente utile per gli schemi di sollevamento e trasporto che possono variare da una ditta all’altra.

Yes, it is possible from version 21.00.00. If you have a previous version just update the program from this site and then you will be able to select "Verify Existing" in the materials window.

PREF Free Download

Please fill in the form below and we will send you an email with the link to download the FREE version of the software and all the instructions to the email address you entered.

Information request

Please fill in the following form, our staff will answer as soon as possible to the email address you entered. 

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