The chimney object of this study belongs to an old industrial settlement in the northern boundaries of Milan, still working nowadays despite the transformation occurred in the surrounding area. So it is also an important landmark (more than 50 m high), not only for the factory itself but also for the neighbors, despite a quite brutal intervention in the ’70 that covered the brickwork with a concrete shell. According to Property wishes, the authors have been charged to investigate the actual conditions of the chimney, that is no more used for smoke discharge, but is standing in the middle of the factory near the thermal plants and can pose relevant problems for safety, so that prevention of possible failure is mandatory. Starting from a wide “on site” analysis made by alpinist-surveyors with the support of a breakdown crane, a preliminary inspection has been possible not only of the geometry, sections and type of materials but also the state of conservation. Then, according to current Italian Building Code (DM 14.01.2008), the chimney has been studied both by means of a finite element model and by simplified methods. The intersection between practical and theoretical approach allowed to get comparable results, on the basis of a detailed comprehension of how the chimney have been built and how it works from a structural point of view. Global checks have been rather positive, regarding both to wind and seismic actions. On the basis of these results, the focus has been directed from structural checks to materials’ consistency and durability (i.e. from model to on site object) and to the actions that are needed to prevent in the future loss of materials and decay. Common solutions (repointing of mortar joints, painting outside surface to prevent bar oxidation and cracking of concrete covering) can become expensive for the difficult working conditions, moving from bottom to top both inside and outside of the chimney. Proper solution has to consider both technical and logistic issues, to set up an inspection and maintenance program that can assure safety control also in the future.

(2014). Survey and Assessment of a masonry chimney in Milan . Retrieved from http://hdl.handle.net/10446/91544

Survey and Assessment of a masonry chimney in Milan

MIRABELLA ROBERTI, Giulio;
2014-01-01

Abstract

The chimney object of this study belongs to an old industrial settlement in the northern boundaries of Milan, still working nowadays despite the transformation occurred in the surrounding area. So it is also an important landmark (more than 50 m high), not only for the factory itself but also for the neighbors, despite a quite brutal intervention in the ’70 that covered the brickwork with a concrete shell. According to Property wishes, the authors have been charged to investigate the actual conditions of the chimney, that is no more used for smoke discharge, but is standing in the middle of the factory near the thermal plants and can pose relevant problems for safety, so that prevention of possible failure is mandatory. Starting from a wide “on site” analysis made by alpinist-surveyors with the support of a breakdown crane, a preliminary inspection has been possible not only of the geometry, sections and type of materials but also the state of conservation. Then, according to current Italian Building Code (DM 14.01.2008), the chimney has been studied both by means of a finite element model and by simplified methods. The intersection between practical and theoretical approach allowed to get comparable results, on the basis of a detailed comprehension of how the chimney have been built and how it works from a structural point of view. Global checks have been rather positive, regarding both to wind and seismic actions. On the basis of these results, the focus has been directed from structural checks to materials’ consistency and durability (i.e. from model to on site object) and to the actions that are needed to prevent in the future loss of materials and decay. Common solutions (repointing of mortar joints, painting outside surface to prevent bar oxidation and cracking of concrete covering) can become expensive for the difficult working conditions, moving from bottom to top both inside and outside of the chimney. Proper solution has to consider both technical and logistic issues, to set up an inspection and maintenance program that can assure safety control also in the future.
2014
MIRABELLA ROBERTI, Giulio; Castiglioni, Andrea
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