PSI - Issue 72

Boris Folić et al. / Procedia Structural Integrity 72 (2025) 286 – 293

289

3. Passive soil resistance and load phase changes on caissons Some phases of loading during installation and flooding of the right caisson should be considered. As for construction, the coastal caissons-pillars were cast in place and later pneumatically lowered to the foundation depth. The middle caisson was made on the shore, upstream, excavated until it started to float, and brought to the designed place. However, at the middle caisson, the vessels that were intended for delivery still did not have enough power, so the waterway was closed and help was sought in the form of additional vessels. After that, it was brought to the intended scaffolding and lowered to the designed height. A counterweight was used for lowering, and the upper part of the column was concreted. The central, river pillar in the longitudinal section has the shape of a boot, i.e. due to the significant difference in load, the foot of the pillar is eccentrically extended to the side towards a smaller arc. So we have the oblique force from the small arc, if we know the angle of the tangent at the support of the arc, we can decompose it into horizontal and vertical components. We will ignore the arc fixed moment at this stage.

Fig. 4. Picture of the Žeželj’s bridge with coastline after building.

Fig. 5. Plane view of the banks, new Žeželj bridge and left Varadin rainbow bridge. Google earth.