Simulation of earthquake caused building damages for the development of fast reconnaissance techniques
Abstract
Fast and reliable reconnaissance techniques are essential for efficient disaster management in urban areas with a large number of collapsed buildings occurring mainly after earthquakes. A rapid damage state analysis of buildings based on the comparison of pre- and post-event geometric models of the buildings can be used to detect the location, extend and characteristic of totally or partially collapsed buildings. The geometric models are created based on the data of an airborne surveying technology called laserscanning. Basically, these are height measurements from an airborne sensor to the regarded objects. The result is typically stored as so-called digital elevation models (DEM). In this approach, an automatic procedure is used to derive geometric building models from these DEMs. At the moment there is no laserscanning derived data of earthquake damaged buildings available. For the evaluation of the developed damage analysis tools, the simulation of such data is necessary. In this paper two approaches to simulate pre- and post event data sets are presented. The first possibility is to create detailed CAD models of undamaged buildings surveyed by laser-scanning, using the construction plans of these building. Different damages observed at similar buildings are applied artificially to these CAD models resulting in CAD models of damaged buildings. A second approach is to use photogrammetrical evaluation of digital photographs of collapsed buildings to generate three-dimensional "post-event" CAD-Models. On the basis of these damage state models and on-site investigations models of the buildings in their initial undamaged state are simulated.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA....10266M