Prestressed/post-tensioned concrete bridges - Computational Analysis and Design of Bridge Structures - page 150

Table 5.2 Assumption of the construction time
Building stage

Control date of plan Construction time (weeks)

1 July 18 6

2 September 9 4

3 October 8 6

4 December 8 6

5 January 29 6

6 March 31 6

Total 34 weeks 34 weeks

Figure 5.23 Elements of Verzasca 2 Bridge model 5.

essential differences between this model and Model 4. However, Model 5
will provide more accurate results due to its static analysis, especially with
the effects of the skew supports.
The superstructure is modeled with three beams. Each represents one
web of the double-cell box cross section. Taking Model 4 as a starting
point, the geometry of the four middle spans can be copied and repro-
duced. As the abutments are placed perpendicularly to the longitudinal
axis, beams in the first and sixth spans have to be extended or shortened,
respectively. The geometry of the tendons is newly created according to the
construction plans. The three beams are connected with transverse beam
elements, which provide the transverse flexural rigidity of the section.
The cross section is divided into three by making two cuts in the middle of
each cell. The new area and moment of inertia are calculated for the beam in
the middle web and flanges. For both beams on the side, the remaining area
and moment of inertia are divided by two. The torsional inertia for each