PSI - Issue 44

Fabio Di Trapani et al. / Procedia Structural Integrity 44 (2023) 496–503 Di Trapani et al./ Structural Integrity Procedia 00 (2022) 000–000

499

4

(a)

(b)

(c)

Fig. 3. Refined FE Micro-model of the infilled frame in OpenSees / STKO: (a) Element subdivision; (b) Geometric layout of reinforcement and Node-to-node element links (connection between rebars and frame); (c) Modelling of frame-infill the interface.

2.3. Analysis and model validation The analysis of the experimental test model was carried out in two steps. First vertical loads were applied at the top of the columns to reproduce the gravity load conditions reported in Table 1. In a second step, a horizonal monotonic increasing displacement is assigned. In Fig. 4, lateral force- lateral displacement curves obtained from the analysis are compared with the positive and negative experimental monotonic envelopes. As it can be observed, numerical responses suitably approximate the average experimental trend in terms of peak resistance, stiffness and post-peak decay. In Fig. 5, experimental and numerical damage patterns are also compared. Also in this case, the numerical model was able to adequately predict the main cracking patterns in the masonry (bricks and mortar joints) as well as in reinforced concrete elements (shear and flexural damage).

300

300

350

Cavaleri & Di Trapani, 2014 (S1C)

Cavaleri & Di Trapani, 2014 (S1A)

Cavaleri & Di Trapani, 2014 (S1B)

300

250

250

250

200

200

200

150

150

150

100

100

100

Lateral force [kN]

Lateral force [kN]

Lateral force [kN]

Experimental envelopes FE Micromodel

50

50

Experimental envelopes FE Micromodel

Experimental envelopes FE Micromodel

50

0 5 10 15 20 25 30 35 40 45 Displacement [mm] 0

0 5 10 15 20 25 30 35 40 45 Displacement [mm] 0

0 5 10 15 20 25 30 35 40 45 Displacement [mm] 0

300

300

350

Mehrabi & Shing, 1996 (9)

Mehrabi & Shing, 1996 (5)

Mehrabi & Shing, 1996 (8)

300

250

250

250

200

200

200

150

150

150

100

100

100

Lateral force [kN]

Lateral force [kN]

Lateral force [kN]

50

50

Experimental envelopes FE Micromodel

Experimental envelope FE Micromodel

Experimental envelopes FE Micromodel

50

0 5 10 15 20 25 30 35 40 45 Displacement [mm] 0

0 5 10 15 20 25 30 35 40 45 Displacement [mm] 0

0 5 10 15 20 25 30 35 40 45 Displacement [mm] 0

Fig. 4. FE Micromodel experimental / numerical comparisons.