The paper analyses some aspects related to retrofitting interventions on reinforced concrete walls’ buildings, which no longer meet the current energy standards required. In particular, the weight of thermal bridges on the overall thermal dispersion is analysed both before and after the retrofitting intervention. Many residential neighbourhoods in Europe between the '60s and' 70s have been realized with such industrialized constructive techniques (i.e. “coffrage-tunnel” and “banche et table” systems). This paper by means of existing literature analyses several technological solutions and the related dispersions, focusing on reinforced concrete wall-floor thermal bridge, which is the most recurring one in multi-storey buildings. A list of the most common technical solutions was drawn up by identifying their dimensional and material characteristics (wall and thermal insulation thicknesses, floor type and thickness). Three technological solutions of wall-floor junction (reinforced concrete slab, "Predalles" and prefabricated hollow bricks floor) were finally studied, with different thickness, identifying 216 different case studies. We have proved the non-applicability of the existing atlases for these types of thermal bridge, leading to an underestimation of about 25% in sharp contrast with the UNI 14683:2008, whose values should, however, be precautionary over-estimated. For each case study, the calculation of linear thermal transmittance, based on standard procedures, was carried out. The results of the research will be useful for the implementation of existing atlas to facilitate the calculation of thermal bridges on buildings based on reinforced concrete walls.

Thermal bridges in industrialized building. The case of reinforced concrete wall-floor junctions

Basiricò Tiziana
;
2018

Abstract

The paper analyses some aspects related to retrofitting interventions on reinforced concrete walls’ buildings, which no longer meet the current energy standards required. In particular, the weight of thermal bridges on the overall thermal dispersion is analysed both before and after the retrofitting intervention. Many residential neighbourhoods in Europe between the '60s and' 70s have been realized with such industrialized constructive techniques (i.e. “coffrage-tunnel” and “banche et table” systems). This paper by means of existing literature analyses several technological solutions and the related dispersions, focusing on reinforced concrete wall-floor thermal bridge, which is the most recurring one in multi-storey buildings. A list of the most common technical solutions was drawn up by identifying their dimensional and material characteristics (wall and thermal insulation thicknesses, floor type and thickness). Three technological solutions of wall-floor junction (reinforced concrete slab, "Predalles" and prefabricated hollow bricks floor) were finally studied, with different thickness, identifying 216 different case studies. We have proved the non-applicability of the existing atlases for these types of thermal bridge, leading to an underestimation of about 25% in sharp contrast with the UNI 14683:2008, whose values should, however, be precautionary over-estimated. For each case study, the calculation of linear thermal transmittance, based on standard procedures, was carried out. The results of the research will be useful for the implementation of existing atlas to facilitate the calculation of thermal bridges on buildings based on reinforced concrete walls.
978-88-9326-210-1
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11387/128958
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