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The new life of the Theatre alla Scala
No full text"The Scala is the first theatre in the world, because it is that which gives the maximum enjoyment" (Stendhal, 1816). Unfortunately, after two centuries of glorious service, the historical-monumental parts and the hall of the Theatre clearly needed restoration interventions, while the backstage, subjected to the weary of time, having undergone hapzard additions and continual adaptations over the years, was no longer able to meet the request of a today's theatre. The project of the New Teatro alla Scala was hence composed by two distinctive parts: the project of the refurbishment and of the restoration of the historical-monumental part and the project of buildings for the new scenic plants. This paper presents an overview of the design concepts and of the problems encountered during the design phases and during the restoring and construction works
INSPECTING AND REPAIRING OLD BRIDGES: EXPERIENCES AND LESSONS
No full textThe concept of life cycle applied to building structures is quite recent. In the past, constructions were built to be everlasting,
and the number of massive buildings and bridges still in service apparently confirms the soundness of this approach. When
reinforced concrete was introduced, new possibilities were open to engineers, in a time when the end of a structure’s life was
still considered as an extreme and very remote hypothesis. However, this belief was soon to be faced with the evidence of the
deterioration of the concrete surfaces and with the corrosion of steel bars and strands, so that the concept of durability had to
be introduced. It therefore became clear that the structures’ constructions have to be monitored and periodically maintained,
so as to extend their service life as much as possible. This paper gives an account of studies and rehabilitation works carried
out on bridges located in the north of Italy, providing some remarks regarding the maintenance of structures of the past and
the design of structure for the future
STABLE AND DIVERGING TIME DEPENDENT BEHAVIOURS IN SOME TYPES OF BRIDGE STRUCTURES
No full textABSTRACT
The behaviour of pre-stressed and cable stayed concrete bridges may be strongly affected by
the time dependent response due to creep and shrinkage of concrete. Same experiences showed
us that, even after accurate design assessments, some unsatisfactory service behaviour can arise,
due to some level of uncertainty in the reference data.
In this paper the role of the uncertainties has been investigated. As sources of uncertainty, the
pretensioning forces in the cables, the relative humidity and the concrete strength have been
considered. For a given set of data, the creep effects have been handled by means of a step by
step computation of the stress history. The effects of the uncertainties have been simulated
through a Monte Carlo approach.
Two topical cases have been studied. The first set is exemplified by cable stayed bridges. In
these structures, the role of uncertainties does not influence the time dependent behaviour
sensibly and the system seems to be self-stabilizing over time. The second set is represented by
prestressed cantilever-built bridges, for whom the effects of uncertainties cause a significant
variance of the tip deflections. Finally, some suggestions to govern such type of delayed
behaviours are proposed
THE NEW LIFE OF THE TEATRO ALLA SCALA
No full text‘The Scala is the first theatre in the world, because it is that which gives the maximum enjoyment’ (Stendhal 1816).
Unfortunately, after two centuries of glorious service, the historical-monumental part and the hall of the theatre
clearly needed restoration interventions, while the backstage, subjected to the wear of time, having undergone
haphazard additions and continual adaptations over the years, was no longer able to meet the request of a today’s
theatre. The project of the New Teatro alla Scala was hence composed of two distinctive parts: the project of the
refurbishment and of the restoration of the historical-monumental part and the project of the buildings for the new
scenic plant. This paper presents an overview of the design concepts and of the problems encountered during the
design phases and during the restoring and construction works
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