4.2 - VSL

These operations were carried out with some
overlap. Only 4 days after concreting full
stressing could be applied. For this, a
concrete strength of 22.6 N/mmz was
required.
The tendons were cut to length at works,
fitted with the dead-end anchorages and
transported to site rolled up. Strands and
bundles of the same length were identified by
the same colour. At the intermediate
anchorage locations, the tendons were
temporarily stored resting on a 3.5 m wide
formwork overhang (Fig. 97).
Post-tensioning
The choice of post-tensioning by areas gave
not only the most economic solution but also
that with the minimum slab thickness and
minimum deflections. Monostrands Ø15 mm
(0.6") of 146 mm 2
cross-section and 257.8
kN ultimate strength were used for the
tendons. In total, 21 metric tons of
prestressing steel, 596 stressing
anchorages, 596 dead-end anchorages and
138 intermediate stressing anchorages were
required. Along the colum lines, two and Figure 95: Plan of the slab above ground floor
Figure 96: Cross-section (axis 10)
Figure 98: Monostrands with intermediate an chorages at
construction joint
Figure 97: Storage of tendons at construction joint
Figure 99: Anchorage block-outs before being filled whit mortar
Figure 100: Installed cables of the third section Figure 102: Cables in column region
34