PSI - Issue 44

Gianmarco de Felice et al. / Procedia Structural Integrity 44 (2023) 2122–2127 G. de Felice / Structural Integrity Procedia 00 (2022) 000 – 000

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forces are incrementally increased by checking the quasi-static equilibrium condition for each imposed force value, until the achievement of the peak acceleration. Afterwards, the mechanism is triggered, and the horizontal load distribution is updated step by step so that the kinetic energy of the structure remains limited to respect the quasi-static condition, until the displacement capacity of the structure is reached. For both the branches, each acceleration value is associated with the horizontal displacement of a control point, in equilibrium.

Photogrammetry

Point cloud

Orthophoto

3D textured model

(a)

(b)

(c)

Model geometry

Mesh refinement

Semi-automatic mesh detection

(e)

(f)

(d)

DEM modelling

Materials assignment

Capacity curve

Collapse mode

(h)

(i)

(g)

Fig. 2. The integrated methodology – Photogrammetric survey: (a) point cloud, (b) 3D textured model, (c) orthophoto, (d) semi-automatic block mesh detection, (e) mesh refinement in CAD, (f) model geometry; DEM modelling: (g) assignment of material properties, pushover analysis – (h) collapse mode and (i) capacity curve. 4. Results Fig. 3 shows the results of the pushover analysis performed to the macro-elements of the church under investigation. The final configuration of the collapse mechanism (Figs. 3a-c) and the capacity curve (Fig. 3d) are represented for the façade, under either in plane (Fig. 3a) and out-of-plane (Fig. 3b) loads, and for the SW lateral wall subject to out-of-