Numerical Analysis of Prestressed Hollow Core Slabs under Long Term Loading

Resumen

This paper presents a numerical analysis of prestressed hollow core slabs under long term loading. The model considers explicitly the geometrical changes in cross section as well as the time dependence of the loads and of material properties in order to predict the actual stage of displacements, strains and stresses. The hollow core slabs are divided in several sections each one having a set of elements. Each element can have not only different geometrical and material properties but also load histories. The numerical results are compared with experimental tests performed on two series of prestressed hollow core slabs. Each series had a different geometry, rate and distribution of prestressing strands as well as material properties. Loads and mid-span displacements were evaluated for at least 114 days. Good correlation was achieved with both series at and below the service load level.