Seismic Behaviour And Strengthening Of A
Vulnerable Structure
Author(s)
F. V. Karantoni
Abstract
The strengthening measures of an unusual masonry building of high seismic
vulnerability are presented and assessment of their effectiveness is performed.
The building is highly asymmetric and it is located in a zone of seismicity II,
according to Greek Seismic Code. In addition, two adjacent walls have openings
along 71% of their length. The building is scheduled and the authorities
responsible for the preservation did not allow interventions that may alter its
faces. Herein, the seismic response of the structure as well as the effectiveness of
the finally adopted measures is presented. The effectiveness is assessed by
comparing the overstressed areas of the original building with those of the
strengthened one. The measures proposed are the replacement of flexible floors
by stiff composite slabs, the construction of a reinforced concrete tie belt at the
top of all structural walls, grouting of cement grout, repointing the masonry and
the construction of a double shotcrete jacket.
Key words: masonry buildings, damage, vulnerability, strengthening.
1 Introduction
A historic or a scheduled building often remains undamaged regardless of the
seismicity of the area, the empirical way of construction, and the lack of design.
Sometimes, observing an old building makes us think that nowadays it would be
constructed with a quite different engineering design. This paper is involved
with such a building. The unusual structure under consideration is a building
highly asymmetric in plane and in elevation, with few structural walls. The
relatively high structural walls (up to 11.2 m) of the north and west sides have
many openings of approximately 71% of the length of the walls, the upper storey
has an area of about one half of the lower storey, and the building has no rigid
diaphragms. It has floors and a roof of timber joists.
Keywords
masonry buildings, damage, vulnerability, strengthening.
Related Book
Other papers in this volume
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