Graphics Programs Reference
In-Depth Information
Figure 14. Camera positioned closer to the model
VR model of the Incremental
Launching method of
Bridge Construction
ments needed in the virtual scenario were modeled
and then the interaction was programmed using
the some software based on the virtual reality
technology, the EON Studio. The 3D model of all
elements was generated using AutoCAD .
The metal elements supporting the form and
the formwork itself composed by beams and
panels, made of wood, were created. To represent
the reinforcements a steel mesh was designed.
With the objective to allow some immersive ca-
pacity to the model, the river was represented by
a surface with mixed colors and the selected
panorama simulates a typical environment of
river banks.
In order to report an overview of the construc-
tion place the camera points initially to the casting
yard (Figure 15). At this stage just the abutments,
piers, and beams of the foundation of the yard are
visible. Next, the exterior form work composed of
26 identical elements is building up. So, only the
assembly of one element is visualized in detail.
During the animation, the position of the camera
and its movement are synchronized to show the
details of the elements or the assembly type and
also an overview of the working place.
After placing the external panels of the shut-
tering and the reinforcement mesh, starts the
visual simulation of the casting work. The ele-
ments that make up the interior false work are
placed incrementally, starting with the metallic
support, followed by the longitudinal beams and
Another interactive model concerning construc-
tion of deck bridges to support Civil Engineer-
ing education was created (Martins, 2009). The
construction of bridge decks using the method on
incremental launching exist from the 60s but their
implementation did not occur in the same way in
different countries. As possible causes are the aes-
thetic constrains and the high investment needed.
The developed RV model provides a contribution
to the dissemination of information concerning
this construction method, through a recording of
visual simulation of the phases and the equipment
that comprises the construction process.
The method of construction to apply has a great
influence on the selection of the cross section of
the deck and, consequently, on the structural solu-
tion. The incremental launching method consists
of casting 15 m to 30 m long segments of the bridge
deck in a stationary formwork (Figure 15) to push
a completed segment forward with hydraulic jacks
along the bridge axis.
This method is appropriated in viaducts over
valleys and mountains with spans about 50 m . The
application of the process requires that the cross
section of the deck is constant, because each sec-
tion will have different states of bending moments
and thus different tensions. The adequate type of
section is the box girder (Figure 16). Every ele-
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