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lightweight spandrel ribs

Figure 21. Light spandrel ribs construction phases: a) a layer of plaster mesh is placed overlaying the vault extrados; b) the mesh is covered with a layer of clay mortar; c) polystyrene ribs are placed along the vault ring and covered by plaster meshes; d) a thin finishing layer of clay mortar is spread over the structure.

Figure 22. SanPietro Church (RoeVolciano, Brescia): light spandrel walls strengthening the single leave masonry dome covering the presbitery.

Figure 20. San Pietro Church (Roe Volciano, Brescia): distribution of the lightweight spandrel ribs along the extrados of the nave vault and detail of the spandrel rib cross section.

Figure 23. Experimental test on light spandrel walls (Pisa Laboratory, University of Brescia, Italy).

Figure 21. Light spandrel ribs construction phases: a) a layer of plaster mesh is placed overlaying the vault extrados; b) the mesh is covered with a layer of clay mortar; c) polystyrene ribs are placed along the vault ring and covered by plaster meshes; d) a thin finishing layer of clay mortar is spread over the structure.

The inner lightweight core is made of polystyrene elements.

In San Pietro Church, spandrel ribs were placed along the vault extrados as shown in Figure 20. The construction phases are briefly illustrated in Figure 21.

Figure 23. Experimental test on light spandrel walls (Pisa Laboratory, University of Brescia, Italy).

The same technique was applied to strengthen the single leave masonry dome covering the presbitery (Figure 22).

The eff iciency of the proposed technique was also verified experimentally (Figure 23). The structure was subjected to cyclic, unsymmetrical load conditions. Good results were obtained both in terms of stiffness and strength (Giuriani et al. 2007).

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