PSI - Issue 64

Galić Josip et al. / Procedia Structural Integrity 64 (2024) 908 –917 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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bearing capacity criterion, is a g /g = 0.249, with the importance factor γ I = 1.2, as it is a faculty building. In addition to meeting technical regulations, another condition was that the floor plan layout remains flexible as before. It was necessary to find a strengthening method that does not affect the existing space. Furthermore, the building renovation was funded from a solidarity fund (EU) with a time limit for expenditure, so the choice of strengthening had to be simple and quick to execute. Based on all the above, the direction of strengthening the existing structure was decided with the following interventions, confirmed by numerical modeling and analysis and shown in Galić etc (2023). With these interventions, the building meets all the aforementioned parameters and requirements of current regulations: • Rehabilitation of all masonry walls remaining by injection and wrapping in FRCM • Construction of new reinforced concrete walls to ensure sufficient rigidity of the building in both directions • Wrapping of all columns and beams with CFRP fabric • Construction of new reinforced concrete slabs and compression slabs • Strengthening of compression slabs with metal strips • Installation of steel frames on the facade of the street building • Construction of new foundation beams to prevent ground settlement due to increased weight.

Fig. 8. (a) floor plan of strengthened structure, (b) 3D numerical model for analysis

The main strengthening involves the installation of a steel truss on both facades. The truss is installed by connecting it to the external existing column or facade frame. The truss does not affect the existing floor plan, and since it is on the outer side, it does not need fire protection and cladding because the existing load-bearing structure still carries the primary vertical load. The steel structure ensures stability and resistance to seismic action.