Estimation Of Residual Carrying Capacity And
Restoration Of The Historic Reinforced Concrete
Shells And Frames Erected In Estonia
Author(s)
H. Onton
Abstract
The purpose of the research work was to examine and analyze the technical
situation and to work out a restoration solution for the hydroplane hangars
reinforced concrete shells and frames erected in Estonia.
The hydroplane hangars were designed and erected between 1915 and 1917
both in Tallinn and in Saaremaa, Estonia.
Due to the fact that from the civil engineering point of view the most
important structure is the reinforced concrete roof shell of the Tallinn hangar,
will this paper mainly focus on this historical building.
This large span structure consists of three spherical and seven cylindrical
reinforced concrete roof shells and four two-storey towers. It is the first concrete
structure of this type in the whole world, designed and erected at the beginning
of the 20th century. Because of very bad maintenance during recent decades and
due to the absence of roofing, windows and doors, water and moisture have been
able to penetrate the concrete surface, causing moisture and frost damage of the
concrete. To determine the mineralogical composition of cement stone, an X-ray
analysis was performed. Strength analyses were carried out according to EPNENV
codes. We can say that most axial and shear forces and bending moments
are relatively small. This is the reason why the badly damaged structure has not
yet partly or wholly collapsed. The restoration works were begun in autumn
2001 with the central part of the hangar. It was decided to carry out only
extremely urgent works.
Keywords: national heritage, residual carrying capacity, restoration.
Keywords
national heritage, residual carrying capacity, restoration.
Related Book
Other papers in this volume
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