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2021-01-18

Calculating Prestressed Hollow Core Slabs

Prestressed concrete slabs consist of composite, uniaxially stressed hollow plates with a width of about 1.20 m. These elements are prestressed with pre-tension in a precast concrete plant. The precasting is usually done with slipformers. Due to the lesser self‑weight of the non‑solid slab and the existing prestress, these precast prestressed hollow core slabs show a lower deflection than loosely reinforced slabs made of solid concrete.

With the RF‑TENDON and RF‑TENDON Design add-on modules, you can design components with an immediate bond. In Image 01, a prestressed hollow core slab element was designed.

The cross-section was modeled with SHAPE‑MASSIVE and imported into RFEM. The structural system with loading was modeled in RFEM. The geometry of the tendons and the prestressing parameters were defined in RF‑TENDON. The equivalent loads from prestress were automatically transferred from RF‑TENDON to the structural system; the internal forces were calculated in RFEM. The designs for the ultimate limit state and the serviceability limit state were performed in RF‑TENDON Design.


Author

Mr. Meierhofer is the development leader of programs for concrete structures and is available for the customer support team in case of questions related to reinforced and prestressed concrete design.

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