Naslov
Modelling current state of ex torpedo launch pad structure in Rijeka

Autori
Topić, Petar ; Šćulac, Paulo ; Krvavica, Nino ; Ferenčić, Daniela ; Komparić, Martina ; Tuhtan, Miran ; Bjelanović, Adriana ; Grandić, Davor

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings of the 3rd International Conference of Industrial Heritage. Rijeka, the historical traffic crossroad between Mediterranean and Europe / Smokvina, Miljenko - Protorpedo Rijeka ; Lenac, Zdravko - Sveučilište u Rijeci - Rijeka, 2007

Skup
3rd International Conference of Industrial Heritage. Rijeka, the historical traffic crossroad between Mediterranean and Europe

Mjesto i datum
Rijeka, Hrvatska, 12.10.2007. - 13.10.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
reinforced concrete structure; timber roof structure; reduced bearing capacity; 3D space frame model

Sažetak
The overall state of damage of the ex torpedo launch pad in Rijeka and an engineering model of the structure, needed to determine its resistance to the various effects it is subject to, have been defined based on the damage estimate procedures presented in a separate work. In this work we present the computational model for the current condition of the structure, i.e. its reinforced concrete spatial frame and the timber roof truss, as well as the procedures to calculate its mechanical resistance and stability. There are several reasons for making this intermediate step before setting up the final repair plan. To start with, the effects of the decades long lack of maintenance are highly obvious. The age of the building and its exposure to aggressive atmospheric and maritime conditions have greatly contributed to deteriroation of the material properties of concrete and reinforcement, which in turn has led to a reduction of the load-bearing capacity of the structural elements. Aside from the corrosion-induced reduction of the effective cross-sectional area of the reinforcement bars, the corrosion has also detrimentally affected the concrete-steel adhesion properties as well as a progressive damage and often a complete destruction of the concrete reinforcement protection layer. The structure itself is geometrically rather involved and quite untypical. The reinforced concrete part of the structure is statically modelled as a space frame, while the timber roof structure is modelled as a set of planar trusses which are supported by the space frame underneath. The geometrical properties of the structure including the dimensions of the beam and column cross sections have been eventually defined after the original documentation had been amended with the field measurements. The material properties of the concrete and steel (Young's moduli, strength, permeability, amount of chloride ions) have been determined from the laboratory tests conducted on the specimens taken from the building. In the analysis of the load-bearing capacity and stability of the structure, the current exposure to self-weight and external influences as well as a nominal live loading for public utilities have been taken into account. This is in sharp contrast to the industrial loading the structure was designed to support in the days of its original application. Nowadays, self-weight of the building makes the bulk of its loading. Current payload due to people and smaller weights have been added to the actions of snow on the roofing and wind on the partially opened building. Seismic activity of the area has also been considered and appropriate static loading due to earthquake has been duly accounted for. Special attention has been paid to the definition of the quasistatic loading caused by the sea waves. This is a non-trivial problem owing to the lack of suitable analytical procedures. Apparently, this was recognised as a considerable problem by the designer of the original structure, as the building itself is rich in solutions obviously meant to prevent the destructive effect of the waves. The results of the present analysis are going to be taken as a starting point for our future activities, which include proposing a suitable repair procedure in terms of its structural and technological viability as well as its economic sustainability. The procedure should take into consideration the unquestionable historical and technological importance of the launch pad and pay particular attention to an appropriate selection of the repair material which should geologically resemble the original material of the building as much as possible, while being sufficiently resistant to the aggressive environmental conditions. The procedure should also computationally predict the behaviour of the structure during the process of retrofit and replacement of the damaged elements and eventually model the repaired structure and assess the effect of its improved resistance and stability.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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