PSI - Issue 11

Mario Fagone et al. / Procedia Structural Integrity 11 (2018) 250–257 Author name / Structural Integrity Procedia 00 (2018) 000–000

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3. Experimental program

The experimental program described in this paper aims at the analysis of the mechanical behavior of masonry specimens reinforced with CFRP sheets, subjected to both monotonic and cyclic out of plane actions. Particular attention is paid to evaluate the influence of load cycles on the load bearing capacity of the specimens. In the experimental campaign described in (Fagone and Ranocchiai 2016) it has been observed that masonry panels, reinforced with externally bonded CFRP sheets having fiber direction parallel to the bed joints, subjected to out-of-plane loads, substantially behaved, after the occurrence of the first cracks, as separate (reinforced) masonry beams. Therefore, in the experimental program here described we considered masonry beams reinforced by CFRP sheets, as representative of the effective part of a single leaf masonry panel reinforced with horizontal strips, loaded by out of plane actions. The specimens were tested using a four-points test scheme as schematized in Figure 1.

CFRP

CFRP

935 118

51

Figure 1. Test scheme (measures in mm)

3.1. Specimens

The masonry specimens were manufactured using 1:2 scale bricks (dimensions 28 ´ 53 ´ 113 mm) obtained cutting solid pressed bricks, having initial dimensions of 65 ´ 120 ´ 250 mm, in eight equal portions. Ready mixed mortar was used to make the joints: all of them had thickness equal to 5 mm. Since the width of the reinforcement considered in the experimental program was equal to 63 mm (approximately equal to the thickness of two 1:2 scaled bricks plus two bed mortar joints), it seemed reasonable to consider a reinforced masonry beam made of three brick layers (see Figure 2a) as representative of the effective part of a single leaf panel reinforced by CFRP sheets having fiber direction parallel to the bed joints. The geometric characteristics of the specimens considered in the experimental program are reported in Figure 2b. Three specimens were subjected to monotonic four-point bending (1T.0.M series) whilst other three specimens were subjected to cyclic tests (1T.0.C0 series). Each specimen was labelled with the series name followed by a number from 1 to 3.

63

93

935

935

53

53

(a)

(b)

Figure 2. (a) specimen brickworks (measures in mm) and (b) dimensions of reinforcing system.

All the specimens were cured for at least 28 days at room temperature and moisture before strengthening with CFRP sheets having length equal to the specimen one. The reinforcement was realized with a single layer of carbon