An intervention to strengthen reinforced concrete pillars using carbon fiber wrapping technique in the context of a 20th-century architectural setting that underwent extensive renovation in the 1960s. The ‘Don Nicola Mazza’ University College is a cluster of buildings, each serving various activities related to university education.
The architectural complex on Via San Carlo in the center of Verona is the historical seat of the Don Mazza Institution and serves as a male college. The structural adaptation interventions affected two adjacent buildings, connected to each other, constructed in different eras.
BUILDING 1 – Built in the 1960s, it consists of a basement, ground floor, first, and second floors. It features reinforced concrete walls in the basement and reinforced concrete frames with reinforced concrete and brick floors in elevation.
BUILDING 2 – A historical building constructed before the 1900s, it underwent extensive renovation in the 1960s, which preserved only the facades while completely reconstructing the interior with reinforced concrete frames and reinforced concrete and brick floors. It has a ground floor, first and second floors, and no basement.
In the absence of documentation regarding the existing structures, the analysis of the buildings was initially conducted visually and then through calculations. The buildings did not exhibit significant cracking patterns, although some vertical cracks near the joint between them were attributed to thermal movements. The structural analysis utilized all available information obtained through inspections, surveys, realistic reconstruction of construction techniques, and technical knowledge from the era of construction. Additionally, investigations were carried out to determine the geometry of structural elements, and material tests were conducted to determine their characteristics. Subsequently, the structural analysis and verifications were performed using computerized calculation software (Domen Win).
The project did not involve a change in the intended use but focused on functional adaptation. The seismic improvement works were accompanied by the construction of an external reinforced concrete staircase (in the courtyard) and an elevator block in the historical building. Regarding seismic aspects, the planned works were based on the results of assessments of the current state and evaluations of the structure’s safety level under seismic conditions. According to these assessments, it was necessary to reinforce many pillars with flexural reinforcement and some pillars with shear reinforcement. Adequate measures were also taken to address the risk of impact between the two buildings. Regarding the foundations, no distress was observed, and they were deemed suitable for the loads they had been subjected to throughout their history.
REINFORCEMENT OF PILLARS WITH CARBON FIBER
The reinforcement intervention on the pillars using carbon fiber wrapping was carried out after several preliminary operations to prepare the surface of the pillars for proper material application and subsequent vertical and horizontal wrapping according to the project specifications.
REINFORCEMENT WORKS: INSTALLATION OF FIBER WRAPS
REINFORCEMENT WORK > INSTALLATION OF PATCHES
After the wrapping operations, the pillars were plastered to protect the reinforcement work and provide them with adequate fire protection coating.
PROJECT_Functional adaptation works according to Law 338/2000, D.M. 26/2011, D.M. 27/2011 (buildings D-E)
LOCATION_Verona CLIENT_Istituto Don Nicola Mazza DESIGNER_Ing. E. Magagna,
SINTECO ENGINEERING CONSULTING, Verona IMPLEMENTATION_2014
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