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ERES 2001, Malaga, Spain

ERES 2001, Malaga, Spain

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  • 1. Presentation to ERES 2001 Malaga, Spain September 2001 Dipl.-Ing. Maria Bostenaru
  • 2. Structure • Introduction • Requirements on this methodology • General methods for costs planing • Special conditions for retrofitting existing buildings • Costs calculation methodology • Conclusions 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 3. Introduction • Disaster prevention has growing importance • retrofit measures – structural aspects – functional aspects – aesthetic aspects – economic efficiency • building retrofit | building rehabilitation • information on the building ist required • methods on costs estimation available only in some countries 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 4. Requirements on this methodology • should not require location specific values (major goal) • flexible – applicable in different regions – adaptable to different requirements process – extensible according to the growth of knowledge in this field • computer based – extensible to net 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 5. General methods of costs planing • Planing the costs – a method – an adequate structuring of the building object – scheduling of the structural elements and their quantity – documentation of the results – analysis – optimising alternative • range influenced by data availability and not from target precision • strong relation between data collected and costs estimation methods in a particular country (FEMA, BKI) 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 6. General methods of costs planing • New buildings • Existing buildings 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 7. New buildings • 2 main German indexes – costs estimation • building divided into spaces with different functions • key area types • database with similar buildings • applicable in incipient stages of planning – costs calculation • building elements are classified after their execution type • different deepness levels in the structure • applicable in later stages of planning 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 8. Existing buildings • costs evaluation methods for upgrading existing buildings only developed beginning with the last decade • systems used by calculation methodologies: – space usage – building surfaces – building elements – execution steps • methodology of Rolf Neddermann: „old building types“ – ready-made service packs during the planning within the element methodology 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 9. Special conditions for retrofitting existing buildings • Performance level • Decision support • Types of buildings – Inter-bellum Bucharest buildings – Retrofit consideration about historical buildings 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 10. Performance level • Objectives – immediate occupancy – damage control – life safety upgrading existing buildings seismic retrofit rehabilitation expense performance objectives degree damage degree present danger degree 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 11. Decision support • local measures – similar to usual renewal of old buildings • global measures – new elements have to be build in • this methodology creates a framework, in which further values, coming from static calculations can be introduced 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 12. Decision support between local and global measures allowed existing strain strain first measures level: repairing second measures level: isolated elements retrofit third measures level: whole building retrofit 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 13. Types of buildings • historical buildings in town analysis – cultural value • belong to national heritage • no statistical approaches possible – architectural value • representative for a certain building style • retrofit methods restricted through the characteristics of that style – environmental value • with positive influence on the townscape • the building record is the basis for town image analysis 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 14. Inter-bellum Bucharest buildings(1920-45) • mainly residential buildings – 7-11 floors high apartment blocks • RC frame structure with URM masonry infill – designed to resist vertical loads only • non contextual architectural approach – set landmarks in the build context • stylistically very close to turn-of-century European styles – lack of ornaments – aesthetics through simplicity – emphasis of horizontal lines – recesses in the facade 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 15. Costs calculation method Street front with an inter-bellum building Marcel Iancu building (about 1935), 3 Pictor St. Luchian Street 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 16. Retrofit considerations about historical buildings • this methodology breaks up with the statistics – customised approach of different kinds of buildings allowed • guidelines about the characteristics to be maintained • catalogue of adequate building elements • consulting an architect still needed 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 17. Costs calculation methodology • The building record • Retrofit elements • Spatial relationship • Database 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 18. The building record • different detailing ranges • focus on the elements on the last division level • focus on the structural elements – damages – bearing/non bearing parts • RVS to identify where to search after structural details • the record methodology must allow computer assistance but be easy to make with low-end equipment • the data have to be stored in a room book – static measures have to be divided accordingly 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 19. Retrofit elements • The result of retrofit measures are building elements • further division levels – walls in their bearing and non bearing parts – bearing parts into linear, surface and node elements • a retrofit element consists of all works which have to be done in order to strengthen, repair, build a constructive component – old elements (strengthened ones) – new elements (added to the build substance) – retrofitted elements (old elements with new extensions) – replaced elements (new elements instead of deteriorated old ones) 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 20. Retrofit elements and retrofitted elements "line" elements structural parts openings structural connected parts single parts parts included in columns beams stiffening other assemblies columns diagonale braces concrete slot extention reinforcement manteling steel masonry concrete 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 21. Gebäudestruktur II "surface" elements (also parts) bearing walls floors partial total units of the structural parts interior wall exterior wall interior wall exterior wall facade partition wall (between buildings) manteling manteling frame construction plates concrete frame field webbing partial complet bracing manteling 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 22. Retrofit elements • required – clear identification of the building elements – marking of the elements in the 3D model • building elements can be edited as service specification – Tendering-Allocation-Billing modules • elements consist of service specification positions given in a database • element costs are not statistically calculated • element costs are leaded back to the execution steps which caused them 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 23. Surface elements 3 1 F 1 6 5 4 6 V- oder K- Anordnung X- Anordnung 2 2 1. vorhandene Stütze, 2. vorhandenes Fundament, 3. nachträglich eingebaute Scheibe, 4. nachträgliche Fundamentergänzung,5. Bewehrung, 6. nachrägliche Querschnittserweiterung • posterior mounting of slabs in • Posterior mounting of reinforced concrete frames diagonals in reinforced – 5700 - 6700 DM/frame concrete frames – 2000 - 2350 DM/m3concrete – 6800 - 7300 DM/frame 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 24. Retrofit Elements 1 1 10 7 4 5 3 2 6 9 Kautschuk 1 1 8 1. alter Beton, 2. beschädigter alter Beton, 3. neuer Beton, 4. ausgeknickte Bewehrung, 5. neue Bewehrung, 6. neue Bügel, 7. Schweißnaht, 8. alte Bügel, 9. alte Bewehrung, 10. Schalung • Diminution of the rigidity • Retrofit of a column – 100 DM/field 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 25. Example 1 4 : Mauerwerk 3 : Stahlbeton 2 Scaffolding area 4*6*3,00*5,00= 360m² Masonry to be broken away 4*6*4,00*2,88*0,36= 99,54m³ Masonry to be cleaned up 4*6*4,00*2,88*0,36= 99,54m³ 3,00m 2,88m concrete (d= 25cm) 4*6*2,88*4,00*0,25= 69,12m³ Steel (reinforcement: ca. 120kg/m³) 120*69,12= 8294,40kg formwork 2*4*6*4,00*2,88= 553,00m² 4,00m 5,00m 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 26. Example Scaffolding area 4*6*3,00*5,00= process costs 16,00*360,00= 360m² 1.put up the scaffolding 5760,00DM Masonry to be broken 4*6*4,00*2,88*0,36= 72,00*2*4= 2. screening away 99,54m³ 576,00DM 3. put up and away the waste 72,00*4*4= Masonry to be cleaned up 4*6*4,00*2,88*0,36= tub 1152,00DM 99,54m³ 72,00*5,60*99,54= 4. break away masonry wall concrete (d= 25cm) 4*6*2,88*4,00*0,25= 40134,53DM 69,12m³ 4*6*2*175,00= 5. floor break through 8400,00DM Steel (reinforcement: ca. 120*69,12= 6.clean up of masonry broken (25,00+11,50)* 99,54m³= 120kg/m³) 8294,40kg away 3633,21DM formwork 2*4*6*4,00*2,88= (72,00/60*8294,40)= 9953,28DM 553,00m² 7. reinforce – anchoring of the (4*6*72,00*10)= reinforcement into existing 17280,00DM Material Costs reinforced concrete frames 9953,28+17280,00= concrete 200,00*69,12= 13824,00DM 27233,28DM steel 8294,40*1,00= 8294,40DM 8. casing 4*6*72,00*3= 5184,00DM anchorelements 5,65*60*4*6= 8136,00DM 9. paving over 4*6*72,00*1,5= 2592,00DM sum 30254,40DM 10. casing away 4*6*72,00*2= 5184,00DM 99849,02DM 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 27. Spatial relationship • Building divided in – points (nodes) – lines (beams and columns) – areas (Floors and walls) • executed works are related to this elements • static programs can communicate with this elements • the elements will be assigned in a GI-System using the concepts of edge, surface and node 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 28. Database 1 static 1 1 1 measures book room book n n building elements n spatial n model (GIS) service directory 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY
  • 29. Conclusion • The method wasn't‘t applied until now – no statements about certainty degree • a service directory can be hold out from the same database • modular structure – allows generalisation – values can be stored in a standardised format in order to build a database of retrofitted objects • costs estimation for similar future projects 4-6.09.2001 ERES 2001 Calculation of Costs for Seismic Rehabilitation of Historical Buildings Malaga, Spain Maria Bostenaru, University of Karlsruhe, GERMANY