PSI - Issue 78

Francesco Bencardino et al. / Procedia Structural Integrity 78 (2026) 1396–1403 Author name / Structural Integrity Procedia 00 (2025) 000 – 000

1399

4

Reinforced concrete tie beam 1310 x 255 x 200

b)

755

c)

755

100 203 100 203 100 203 100 203 100

a)

200 1250 250

320

650 600

610 320

1700

Anchor

200

100 188 100 188 100 188 100 188 100

Overlapping zone

1310

Reinforced concrete tie beam 1310 x 255 x 250

Fig. 1. B- (a) and S-FRCM (b) strengthening layouts and application (c)

The basalt fabric was a bidirectional open-mesh grid characterized by a 15 mm width and an equivalent thickness of 0.064 mm. Conversely, steel fabric was characterized by galvanized high-strength steel fibers arranged in cords laying on a fiberglass mesh. Each cord was formed by 3x2 wires and had a total cross-section area equal to 0.538 mm 2 ; it was a low-density fabric since it had 1.57 cords per cm. Tensile tests were conducted on basalt and steel dry sheets in order to evaluate tensile strength, which resulted respectively equal to 1663 MPa (CoV=10.1%) and 2623 MPa (CoV=15.0%). 3.2. Test set-up and procedure Fig. 2 depicts the test set-up which basically consisted of a steel resisting frame aimed at transferring loads and sleigh which laid on a zero-frictional roller rail system.

b)

a)

7

6

7

2/4

2

9

8

1

1/3

9

5

Fig. 2. Test set-up and instrumentation

The specimen was blocked both in the upper and in the lower part, in particular on the top of the specimen, four M30 steel rods were placed with the purpose of simulating a fixed end restrain. Two steel frames were placed on the top of the specimen in order to homogeneously transfer compression load to the specimen and then connected to the resisting frame, they were restrained at the edge by means of two diwidag rods which had their avoid rotations. As a consequence, the resulting static scheme essentially was composed of a fixed end restraint on the upper side and a