 |
| Titel |
Physical vulnerability of reinforced concrete buildings impacted by snow avalanches |
| VerfasserIn |
D. Bertrand, M. Naaim, M. Brun |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 7 ; Nr. 10, no. 7 (2010-07-15), S.1531-1545 |
| Datensatznummer |
250008311
|
| Publikation (Nr.) |
 copernicus.org/nhess-10-1531-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper deals with the assessment of physical vulnerability of civil
engineering structures to snow avalanche loadings. In this case, the
vulnerability of the element at risk is defined by its damage level expressed
on a scale from 0 (no damage) to 1 (total destruction). The vulnerability of
a building depends on its structure and flow features (geometry, mechanical
properties, type of avalanche, topography, etc.). This makes it difficult to
obtain vulnerability relations. Most existing vulnerability relations have
been built from field observations. This approach suffers from the scarcity
of well documented events. Moreover, the back analysis is based on both rough
descriptions of the avalanche and the structure. To overcome this problem,
numerical simulations of reinforced concrete structures loaded by snow
avalanches are carried out. Numerical simulations allow to study, in
controlled conditions, the structure behavior under snow avalanche loading.
The structure is modeled in 3-D by the finite element method (FEM).
The elasto-plasticity framework is used to represent the mechanical behavior
of both materials (concrete and steel bars) and the transient feature of the
avalanche loading is taken into account in the simulation. Considering a
reference structure, several simulation campaigns are conducted in order to
assess its snow avalanches vulnerability. Thus, a damage index is defined and
is based on global and local parameters of the structure. The influence of
the geometrical features of the structure, the compressive strength of the
concrete, the density of steel inside the composite material and the maximum
impact pressure on the damage index are studied and analyzed. These
simulations allow establishing the vulnerability as a function of the impact
pressure and the structure features. The derived vulnerability functions
could be used for risk analysis in a snow avalanche context. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|