Σεισμική συμπεριφορά ξηρολιθοδομής
Group Leader: Paulo Lourenco, University of Minho, Portugal
Preservation
of the architectural heritage is a fundamental issue in
the cultural life of modern societies. In recent years,
large investments have been concentrated in this area,
leading to development in the areas of inspection, non-destructive
testing, monitoring and structural analysis of monuments.
Nevertheless, understanding, analyzing and repairing historical
constructions remains one of the most significant challenges
to technicians.
The main objective of this research project is the understating
of dry joint masonry mechanics, under biaxial loading
through experiments. This type of masonry is a representative
configuration of large number of existing monumental structures,
which are made of dry stone joints or exhibit no tensile
strength at the joints due to weathering. The obtained
experimental results will be used for the calibration
of sophisticated numerical methods based on micro and
macro modeling, in order to reproduce the observed experimental
behavior and for parametric studies for providing guidelines
for practitioners.
A series of shaking tests will be performed on dry masonry
specimens to examine the behavior of those walls under
seismic loading. First, a set of tests will be carried
out using different pre - compressive vertical stresses
in order to examine the influence of compressive load.
Then, the internal arrangement of masonry units (sawn,
hand-cut and irregular units) in the global response of
the walls will be examined under in plane cycling loading.
Finally a series of tests with three leaves masonry walls
will be performed applying in plane and out of plane base
acceleration. The types of masonry that are going to be
tested are shown in Figure 1, while in Figure 2 the shaking
table experimental set-up is depicted.
Dry stone masonry wall |
Irregular stone masonry wall |
Rubble masonry stone wall |
|
Three leaf masonry stone wall |
Three leaf masonry irregular stone wall |
Figure 1. Types of masonry |
|
Figure 2. Shaking table experimental set-up. |
Preliminary static tests have already performed during ECOLEADER. In Figure 3 the shear testing apparatus is shown. The two walls were tested under recyclic imposed horizontal displacement, while the vertical load was kept constant without any variation through out the test. The crack pattern of stone masonry is shown in Figure 4
Figure 3. Static tests - experimental set-up. |
Figure 4. Crack pattern of wall. |