CENAT PhD candidates meeting in field of natural hazards, Zürich 2001

1. 4th PhD Meeting in the field of natural hazards
Zürich, Switzerland
16.-18. September 2001
Dipl.-Ing. Maria Bostenaru

2. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Structure
• Introduction to the PhD thesis
• The building survey system
– Role
– Development goals
– Photographic measurements and its results
– Laser measurement and its results
– Layers in the digital model of the building
• Conclusions

3. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Introduction to the PhD thesis: Concept
• a strategic planning system for seismic risk reduction
• plan implementation
• economic, social and administrative guide lines
• different actors in the implementation of retrofit measures
• evaluation as multicriteria decision
• benefit-costs-analysis
• not utility value
• probe and consideration
• development of
• a framework for the summary of the information and decision making
• a method which conceptually supports the experts in setting the priorities
• main focus lies on the layer of building

4. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Introduction to the PhD thesis: Issues
• necessity to develop specific retrofit measures for old
buildings in Bucharest, Romania
• interweaved building substance
• seldom retrofit measures
• main concerning on reinforced concrete
• realisation of retrofit measures has some sociological
aspects
• about ine 5th of the town area on the south of 'kPERYL D demolished
• city slightly affected from this measures
• each relocation regarded suspiciously
• today: unclear property relations and different intentions of the owners

5. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Introduction to the PhD thesis: Goals
• development of a strategic planing system for the
reduction of the seismic risk
• main focus
• interfaces between different planning layers
• priority setting in the realisation of retrofit measures
• measures and realisation steps should be simulated on
different layers

6. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Introduction to the PhD thesis: Methods
• starting point: holistic approach to catastrophe
management
• interdisciplinarity
• estimation of capacities and vulnerabilities
• planing strategy
• intervention layers
– intensive zones
– global zones
• criteria for priority setting
• detailed demonstration project
– information tool
– benefit-costs-analysis

7. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Introduction to the PhD thesis: Results
• focus until now: building models
• framework for an integrated information and decision tool
• costs calculation methods
• methodology which uses “retrofit elements”
• contacts to researchers in Greece and Italy
• approaches about retrofitting monuments
• most recent: building record
• theme of this paper

8. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Role of the building survey system
• Many actors implied in planing measures for improving
seismic resistance
• have to communicate using some basis frame structure
• interested in different “structures” in the building
• survey plans available only for few buildings
• access problems
• problems related to the short survey time
• special structuring of the building for costs estimation as
• no statistical data for the units usually taken are available
• survey wasn’t usually structured for such goals

9. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Development goals
• Modeling of existing buildings
– stucturing of the building
• spatial elements
• data related to the spatial elements
– identification of spatial elements on which this data can be
linked
• depending on the information need of actors in the design process
• depending on architectural, constructive and economic aspects
• Main goal:
– facilitation of the co-operation between actors implied in the
design process
– goal oriented building survey

10. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement
• Today’s software tools allow rapid building survey
– digital photographs Í 3D building model in vector form
• low accessibility requirements
• quick processing
• one-man work
• low precision
• The software alone is no system
– structuring of the information is needed
– post processing for more precision, after data obtained with
other aids is also needed

11. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other

12. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other
Building shell

13. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other
storey shell

14. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other
Other storey shells

15. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other
Floor element

16. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other
Ceiling element

17. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Structuring of the building into shells
– contained one in the other
Wall element

18. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Back to building shell
– providing reference points
– defining building elements between these

19. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Back to building shell
– providing reference points
– defining building elements between these

20. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• Back to building shell
– providing reference points
– defining building elements between these
– defining spaces between these

21. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Photographic measurement results
• The measurement results build a spatial vectorial drawing
of the building
• Dimensions are aproximative
• CAD use allows structuring of the information Í model
building
• Where rapid survey is not enough, laser measurement
provides more exactity

22. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Laser measurement
• Laser measurement took gradually the place of the
traditional building survey
– long time (except 3D-scanning - a kind of photography
– high precision
– almost one-man work
– some accessibility problems
– suitable for detail work
• Software tools for using the data obtained in this way are
in development
– CAD compatible
– custom configuration possibility

23. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Laser measurement results
• elements measured by the laser
– fit in the aproximative structure defined through photographic
measuring
– are detailed surveyed
• data from laser measurement are available as data tables
• modifications are made with use of the database
• vector elements are generated from the databases

24. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Layers in the digital model of the building
• The measurement layer provides lines
– these can be grouped to provide the elements needed by
different actors in the planning process
• retrofit measures
– structural aspects Í structure layer
– functional aspects Í building spaces layer
– aesthetic aspects Í building elements layer
– economic efficiency Í surface and volumes layer
• Procedures
– allow derivation of further layers from the measurement one

25. 16-18.09.2001 CENAT PhD Meeting 2001
Zürich, Switzerland
Maria Bostenaru, University of Karlsruhe, GERMANY
Conclusions
• The measurement results are the basis for the costs
estimation