PSI - Issue 62

Vincenzo Simeone et al. / Procedia Structural Integrity 62 (2024) 561–568 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Figure 1 A) Vision of the still ongoing of the bridge. B) Circular and square dots refer respectively to ascending and descending PS. C) the reconstructed slope deformation on the left side of the crossed stream, N-W flank.

On the same road at a distance of about 2,5 km from this bridge there is another bridge built up on a secondary stream, in the same geological situation of the previous one. the consolidation work on the arch are evident as well as the compression on the iron beams at the base of the abutment and of the pillar to limit the nutcracker deformations of the bridge Fig. 2.

Figure 2 A) The deformed bridge. Is evident the compression on the iron beams at the base of the abutment and of the pillar

3.2 Mansory arch bridge on SP15 connect Bernalda (MT) to Ginosa (TA) This masonry arch bridge 115 m long and 8 m large, consisting of 5 arches 13 m large and pillars of 2 m cross an asymmetric narrow valley in the southern Bradanic trough. Abutments of the bridge are on Sub-Appenine clay deposits. Similarly to the previous case, the origin of this valley, according to the authors, is mainly due to the recent tectonic uplift deformation, confirmed by the strong asymmetry of the valley. The right flank on the western side is really steep and in consequence of its recent origin is subject to deformations. The first arch of the bridge, close to the right flank is damaged and subject to deformation due to a slow gravitative deformation. This is evidenced by the change of inclination of the flank, due to a bulge right before the arch (Fig. 3C). The movement creates a compression of the abutment cracking the arch at the keystone, that was necessary to be repaired (Fig. 3A). The proposed geomorphological interpretation is supported by data from EGMS platform. Several PSs are appreciated in ascending and descending trajectories, due to the orientation of the bridge. The analysis of these data shows that in ascending geometry the points on the right abutment are approaching the satellite, so it is a confirm of the East oriented movement. The same results are find by SPINUA analysis, in this case there are more points with a better distribution, in fact it is evident a linear trend trough the seasonal effects (Figure 3B).