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Energy dissipation devices for structures under blast
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Orientador(es)
Resumo(s)
Terrorism pose a serious threat nowadays and many countries have the concern
of protecting his people and most important buildings. This concern is an
opportunity to strengthen the research of the behaviour of buildings under
blast in order to reduce the magnitude of the effects of these catastrophic
events.
The present thesis aims to create a functional system to improve the security of
critical buildings, either new or adapting old buildings to receive this new
system. This system also tries to be cost efficient, so this can be used in most
buildings.
This thesis was centred in one system with two variations. The systems had the
same lower reinforced concrete slab with 2,60 x 2,00 m and 0,12 m of thickness.
The first system consisted in using 32 steel tubes of 76,1 mm outer diameter
arranged uniformly and eight concrete panels, each one with 1,00 x 0,65 m and
0,07 m of thickness, on top of these tubes. The second system was the same
concrete panels on top of 32 steel tubes with 48,3 mm outer diameter.
To test these systems four blast trials were prepared: the first is the reference
specimen and the other two using the two mentioned variations of the system.
These slabs were tested simply supported in two parallel edges, with a span of
2,30 m. In all tests 6,00 Kg of the explosive Eurodyn 2000 were used at a
distance of 1,85 m from the top of the slab to the centre of the explosive. The
results show an improvement in the residual deformation and on the opening
of the visible cracks of the base reinforced concrete slab.
Descrição
Palavras-chave
Concrete plate Energy dissipater Steel tubes Blast Building blast protection