Seismic Isolation For A Wide Span Glazed Roof
Author(s)
G. C. Giuliani & M. E. Giuliani
Abstract
The roofing of the Crowne Plaza Hotel hall, located in Caserta (Italy), took into
account the constraints given by the structural supports to be laid on the top of
four existing buildings. The earthquake expected PGA is 0.25g. In order to avoid
the important coupling of different structural parts while taking into account the
dynamic behaviour of all them, the solution for correctly supporting the roof was
found by seismically isolating the roof from the top of the existing buildings.
The structural conceptual design included the construction method to be effected
by incremental launching of the space frame with the glass panes already fixed.
The results of the analysis, the detailing of the structure and the construction
method are illustrated.
Keywords: seismic isolation, glazed roof, design, erection.
1 Structural conceptual design
The glazed roof features a sub square plan with side dimensions of 58.52 m and
58.42 m; because of architectural requirements, the roof was shaped as a shallow
lamella dome with a maximum rise at the crown of 6.45 m; see fig 1.
The Owner is Progetto Industrie s.p.a, Caserta, the Architect was Gianmaria
Beretta, SABA srl Milano, Italy and the Constructor was MAEG, Treviso, Italy.
The expected seismic design displacement of the top of the contour in the
existing buildings is around ± 0.30 m and therefore the seismic isolation of the
lamella dome was assumed as the conceptual way to overcome the problem of
imposing such huge displacements on the superimposed structure.
A system of two way sliding bearings on the top of three of the contour
buildings isolates the lamella dome from the relevant horizontal displacements,
while a stiff connection to the fourth one resists the horizontal actions and the
torque created by the inertial forces of the superimposed structure.
Keywords
seismic isolation, glazed roof, design, erection.
Related Book
Other papers in this volume
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