Long-Term Behaviour of Composite Slabs Prestressed with Unbonded Tendons

摘要

Mechanical modelling of post-tensioned steel-concrete composite slabs withunbonded tendons is discussed. The model was added as an option to COMPCAL, a finite element program developed at Ecole polytechnique federale de Lausanne, Switzerland. The work focused on the long-term behavior of composite slabs in the serviceability limit state. Therefore, special attention was paid to the effects of creep and shrinkage of the concrete, and to those of relaxation of the prestressing steel. As an example, an analysis for a two-span slab was carried out.