Zürich

4th PhD Meeting in the field of natural hazardsZürich, Switzerland

16.-18. September 2001Dipl.-Ing. Maria Bostenaru

16-18.09.2001 CENAT PhD Meeting 2001

Zürich, SwitzerlandMaria 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



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



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



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



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



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



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



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



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



Photographic measurement results

• Structuring of the building into shells– contained one in the other





Building shell





storey shell





Other storey shells





Floor element





Ceiling element





Wall element




• Back to building shell– providing reference points– defining building elements between these




• Back to building shell– providing reference points– defining building elements between these– defining spaces between these




• 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



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



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



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



Conclusions

• The measurement results are the basis for the costs estimation

Zürich

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