PSI - Issue 11

Francesca Giulia Carozzi et al. / Procedia Structural Integrity 11 (2018) 355–362 F.G. Carozzi et al./ Structural Integrity Procedia 00 (2018) 000 – 000

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Table 1 – Samples layout Sample name

Reinforcement system

Dimensions [mm]

DW_control DW_G-TRCM DW_cG-TRM

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1040 (h) x 990 (w) x 300 (t) 1045 (h) x 1000 (w) x 300 (t) 1040 (h) x 990 (w) x 300 (t) 1010 (h) x 950 (w) x 300 (t)

G-TRM + 4 Steel connectors cG-TRM + 4 Steel connectors

G-TRM (south side) + 4 Steel connectors + 3 NSM (north side)

DW_G-TRM-NSM

a b Fig. 1. (a) Original masonry structure ; (b) Preparation of the reinforced masonry element.

3. Reinforcement materials

The G-TRM system was composed of a glass fiber textile (Fig. 2a) and a lime mortar. The textile was a balanced grid with fiber yarns disposed in two orthogonal directions at a nominal distance of 20 mm. The cross section area of each yarn was equal to 0.8 mm 2 . The cG-TRM system was composed of a coating glass textile (Fig. 2b) and the same lime mortar. The unbalanced net presented a Styrene Butadiene Rubber (SBR) coating that provides a resistance to alkaline environments. The free space between yarns was 17x12 mm and the cross-section area of the yarns was 0.90 mm 2 and 0.92 mm 2 in the warp and weft directions respectively. Both the TRM systems were applied on the whole surface of masonry walls. The total thickness of the two layers of mortar was about 10 mm on each side. The textile was applied in the mid-thickness. Four connectors were located in each wall on the diagonals, at a distance of about 350 mm from the corner. The connectors were helical steel bars with a diameter equal to 9 mm applied without any matrix. The NSM system was constituted by helical steel bars with a diameter equal to 6 mm (Fig. 2c). The bars were located in three mortar joints and immersed in the reinforcement lime mortar.

a c Fig. 2. Reinforcement components: a) glass fiber grid; b) coating glass fiber grid; c) NSM bars b