PSI - Issue 72

Boris Folić et al. / Procedia Structural Integrity 72 (2025) 278 – 285

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Normal forces at the vertex of the large arch. Normal forces in the upper part of the arch are 8744 kN.

Fig. 4. Displacement in the x direction (horizontal). Model 7.

Displacement in the x direction (horizontal). The upper part of the arch moves towards the center-top, while the lower part moves towards the supports. Maximum arch displacement is 6mm. There is a difference of movement of the upper part in relation to the lower part of the arch, of half a millimeter. This displacement was corrected in the actual project through load history, with hydraulic presses.

Fig. 5. Displacement on the arch in the vertical direction. Model 7.

Displacement of the arch in the vertical direction. It is largest in the crown, and decreases towards the supports. The displacement in the vertex is about 6cm (60mm). Between the upper and the lower arch there is a difference of 0.1mm at the top, and it also decreases towards the supports. 4. About the scaffolding of arches Considering the two different spans of the large and small arch, a 108m RC prefab scaffold was made for the large arch, in order to achieve the requirement of a free fairway profile during construction. Prefabricated RC scaffolding consisted of arches and prop. For the supports of the RC scaffolding, temporary PC piles were first driven into the bottom of the Danube, and then they were connected with raft above the water, like small islands. The layout of the scaffolding for both arches can be seen in the picture below, which was taken from M. Trojanović (1961).