# ALGORITHM FOR THE CALCULATION OF IMMEDIATE AND TIMEDEPENDENT LOSSES, ON SIMPLY SUPPORTED PRESTRESSED CONCRETE GIRDERS

## Palavras-chave:

prestressed concrete, immediate losses on prestressed concrete, time-dependent losses on prestressed concrete## Resumo

The prestressing losses are related to physical and geometric factors, from which, through

empirical equations, it is possible to estimate this value for any given time. Temperature will be

considered constant over time and all prestressing procedure will be done for adherent post-tensile. This

paper is based on the development of a tool in programming language Visual Basic for Applications

(VBA) to calculate the immediate and time-dependent losses, on simply supported prestressed concrete

girders of beams in a manner that presents intuitive interface between the user and the system. Starting

from the necessity of automation of the prestressed concrete projects, this tool uses ordinary pre-defined

cross sections (rectangular, “T” and “I”) with user-defined dimensions for the application of prestressing

forces and for an unlimited number of cables, being possible both the visualization of the each cable

layouts in girder, as well as the immediate and time-dependent losses, following the formulation

proposed by Brazilian Technical Standard NBR 6118 [1].