In CYPECAD version 2025.c, the possibility of defining precast concrete joist floor systems and using them to design joist floor slabs has been implemented. A system or assembly is defined by the selection of a joist, a form and the thickness of the compression layer. Precast elements are selected using the manufacturer's product catalogues that have been incorporated into the program.
The program designs the optimum joist among those available for the selected assembly, as well as the reinforcement to be installed in the job in order to comply with the safety requirements established by the code. To this end, checks are carried out on the ultimate and serviceability limit states, as well as other geometric and quantity checks. To carry out the checks, the real section of the concrete is generated, both precast and poured on site, with its corresponding reinforcement.
Just as with other elements such as beams and columns, the checks can be viewed and listed in detail, and any changes made by the user to the result proposed by the program will affect the checks.
Floor slab systems are available for the following concrete standards: Spanish structural code "Código Estructural" and "Eurocode 2" (including the different national annexes). In addition to the requirements of the concrete standard, the provisions of "EN 15037" have been considered, which complements the specifications for the particular case of prefabricated joists.
