Abstract
Two orthotropic steel deck (OSD) bridges along “Hemus” highway in Republic of Bulgaria are discussed in the paper. They are built at 1985 and are in exploitation over 30 years up to present times. The first of the bridge superstructures is with closed section trapezoidal longitudinal ribs of the OSD and steel plated main girders with 72,45 m span. The second bridge superstructure is with open type section longitudinal ribs of the OSD and steel box main girder with 162m span. Visual inspection and some measurements are performed for evaluation of the overall condition of these bridges. It must be mention that the traffic has considerably increased. Some checks for fatigue for the second bridge are performed in accordance with Eurocode. The condition in respect to fatigue behaviour in accordance with the used structural details in the OSD and the prescriptions of the present design standards is analysed and discussed.
Highlights
In the focus of this article fall two steel road viaducts built in 1985 in Bulgaria. They are situated at km 35+144 (Viaduct 1) and km 35+760 (Viaduct 2) of the “Hemus” highway, which is envisaged to connect Sofia with Varna town, the second biggest Bulgarian harbour on the Black sea
Of the highway the alignment falls into horizontal curve with a constant radius of 850m and longitudinal slope of 4,61%
The road alignment is again falling into horizontal curve with a constant radius of 1467,25m and longitudinal slope of 4,61%
Summary
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