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including emergency cases; they have a very short erection time, small dead load and are
very easy to handle.
Figure 5:
Development of the composite cross sections
The Orăştie - Sibiu Motorway section has two structures (P01 and P11), constructed
in the new PreCoBeam solution. This motorway is part of the corridor that crosses Romania
from Nădlac to Constanţa and lies in the south of the Transilvanian basin, a natural depres-
sion formed in the north of the South Carpathians. This solution was adopted for two skew
≈ 70° overpasses, with one span of 36.5 (⊥) m. The girders are 39 m long and assure a clear-
ance in the orthogonal direction of 35 m. Integral bridges are embedded on their abutments.
A frame static system was adopted in this case as well.
SSF designed very economic composite integral overpasses using the clothoidal CL
connection [15]. The novelty of the system represents the welded steel girders made of S355
J2+N from the prefabricated composite beams. The middle section of the steel girders is
made of a bottom flange and a web with steel dowel cuttings on top. A very slender and
aesthetic aspect was obtained for these overpasses and the solution allowed considerable
material savings. Practically, for both bridges a very good steel consumption of 130 kg/m
2
was obtained.
Figure 6:
Integral overpasses over the A1 Motorway, section Orastie - Sibiu
6. Conclusions
ECOBRIDGE proved to be a very successful project.
The efficient design and construction improves and consolidates the market position
of the steel construction and steel producing industry. Additionally this advanced form of
construction is contributing to savings in material and energy consumption for the structure
during production and maintenance.
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