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International Journal of Architectural Heritage
Conservation, Analysis, and Restoration
Volume 16, 2022 - Issue 7
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Research Article

Design Considerations for Retrofitting of Historic Masonry Structures with Externally Bonded FRP Systems

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Pages 957-976 | Received 14 Mar 2020, Accepted 16 Nov 2020, Published online: 11 Dec 2020

Figures & data

Figure 1. Examples of typical URM buildings located in historic city centres of Central and Southern Europe

Figure 1. Examples of typical URM buildings located in historic city centres of Central and Southern Europe

Figure 2. Typical FRP grid layout on an URM panel

Figure 2. Typical FRP grid layout on an URM panel

Table 1. Mechanical properties of masonry

Figure 3. Geometry of the examined masonry building with indicated macro-elements (piers, spandrels and rigid zones)

Figure 3. Geometry of the examined masonry building with indicated macro-elements (piers, spandrels and rigid zones)

Figure 4. Results of nonlinear static analyses of the URM building

Figure 4. Results of nonlinear static analyses of the URM building

Figure 5. (a) Calculation of the target top displacement for the DL limit state based on the N2 method and (b) piers with exceeded seismic demand for the DL limit state (shaded elements)

Figure 5. (a) Calculation of the target top displacement for the DL limit state based on the N2 method and (b) piers with exceeded seismic demand for the DL limit state (shaded elements)

Table 2. Geometry and shear capacity of URM piers and the DL limit state demand

Table 3. Mechanical properties of FRP reinforcement

Figure 6. Shear capacity of pier PI-275-G in terms of the vertical force for its initial (URM) state and for three CFRP distributions

Figure 6. Shear capacity of pier PI-275-G in terms of the vertical force for its initial (URM) state and for three CFRP distributions

Figure 7. Parametric analysis of the FRP efficiency ratio (VEd,DL/VFRP) expressed in terms of the number of horizontal FRP strips

Figure 7. Parametric analysis of the FRP efficiency ratio (VEd,DL/VFRP) expressed in terms of the number of horizontal FRP strips

Table 4. Shear capacities of CFRP and GFRP strengthened piers for the DL limit state demand and the MCR

Figure 8. Schematic representation of CFRP layouts based on the DL design condition on wall assemblage Wx-1

Figure 8. Schematic representation of CFRP layouts based on the DL design condition on wall assemblage Wx-1

Table 5. Control displacements

Figure 9. Pushover curve comparison of analysed FRP layouts and of the URM case

Figure 9. Pushover curve comparison of analysed FRP layouts and of the URM case

Figure 10. Inter-storey drifts of analysed cases for the DL demand (PGA = 0.15 g) and SD demand (PGA = 0.25 g)

Figure 10. Inter-storey drifts of analysed cases for the DL demand (PGA = 0.15 g) and SD demand (PGA = 0.25 g)

Figure 11. Damage patterns of analysed FRP layouts on wall assemblage Wx-1

Figure 11. Damage patterns of analysed FRP layouts on wall assemblage Wx-1

Table 6. Adopted limit values of chord rotations for piers and spandrels in terms of their failure modes

Table 7. PGA and TR of analysed variants

Table 8. Calculation of the CI for two considered limit states

Figure 12. Retrofit cost vs. the property value ratio and CI of analysed variants

Figure 12. Retrofit cost vs. the property value ratio and CI of analysed variants