PSI - Issue 5

Ivan Baláž et al. / Procedia Structural Integrity 5 (2017) 1057 – 1064 Ivan Baláž / Structural Integrity Procedia 00 (2017) 000 – 000

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after the bridges: Flehe, Germany, 368 m, 1979, Kao-Pin Hsi, Taiwan, 330 m, 1999, Vansu Bridge, Latvia, 312 m, 1981. Ranking of cable-stayed bridges with single tower a nd multi towers in (Baláž, 2014 , pp. 1314-1316).

Fig. 1. SNP Bridge over Danube river in Bratislava, the capital of Slovak Republic

Nomenclature R

factored resistance (e.g. R = R d )

R d specified material resistance R d = R y / γ m = 360 MPa / 1.25 = 290 MPa (280 MPa for thickness t > 25 mm for steel grade 52 (S355) R y specified yield stress γ m partial material safety factor D i nominal dead load effect of element i γ D,i dead load factor for element i L j nominal live load effects for load j other than the rated vehicle γ L,j live load factor for load j other than the rating vehicle L R nominal live load effects for the rated vehicle γ L,R live load factor for the rated vehicle n total number of elements contributing dead load to the structure m total number of live loadings contributing to the live load effects other than the rated vehicle δ factor used to approximate the dynamic effects of moving vehicles ψ c load combination factor ( ψ c = 1 for m = 0, ψ c = 0.9 for m = 1 and 2, ψ c = 0.8 for m > 2) σ c , σ b uniform and bending components of longitudinal compression direct stress in subpanel τ shear stress in subpanel ρ c , ρ b reduction factors of local buckling for subpanel under compression and bending ρ q reduction factor of local buckling for subpanel under shear SNP Bridge is the second permanent bridge over Danube River in Bratislava, the capital of the Slovak Republic. It is a steel cable-stayed bridge with a single backward inclined steel tower and a single cable plane. The asymmetrical position of the inclined 84.6 m high A-shaped tower, crowned by a circular restaurant with 32 m in diameter, creates a natural balance to the famous Bratislava Castle and the St. Martin Dome (Fig. 1). The restaurant UFO (previously called Bystrica; capacity 120 people) and the public observation deck on its roof offer a nice view of Bratislava. SNP Bridge is the only bridge registered in the World Federation of Great Towers, where the key criterion is to have a public observation deck. The bridge certainly looks distinctive and elegant. The bridge has three spans of 74.8 m + 303 m + 54 m with a total length of 431.8 m. Three cables support the 4.6 m high steel orthotropic box girder, dividing the main span into four segments of 51.5 m + 70.2 m + 82.6 m + 98.7 m = 303 m. The main span is 80.2% of the total length of two stayed spans (74.8 m + 303 m). The reason for the major span being longer than usual is that the bridge has a single back stay anchored to the abutment rather than several back stays distributed along the side span. The navigation opening was prescribed to be 10 m × 180 m. 2. SNP Bridge description