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KEYWORDS: codes; damage score; vulnerability class; sesmic risk management 1 THE STRUCTURE OF THE EXISTING BUILDING STOCK IN BUCHAREST The structure of the existing building stock in Bucharest is given in Figure 12 and Table 4. The Bucharest population is about 2 million inhabitants. It is almost constant during the last 10 years. Table 4. Inventory of existing housing units in Bucharest according to the periods of validity of various Romanian seismic codes. Seismic code inter- benchmark periods Housing units built during inter- benchmark periods % housing units built during inter- benchmark periods before 1941 168,556 21.95 ~22% 1941-1963 69,702 9.08 1963-1970 110,669 14.42 1970-1978 119,625 15.57 ~39% 1978-1992 292,594 38.09 1992-1995 6,844 0.89 ~ 39% Total 768,000 100% From Assessment of Seismic Hazard to Retrofitting of Most Fragile Buildings - Experience of Romania: Part II: Seismic Risk Management D. Lungu, A. Aldea, S. Demetriu and C. Arion National Institute for Building Research, Bucharest and Technical University of Civil Engineering, Bucharest ABSTRACT: According to the number of people lost in earthquakes during XX th century as well as in a single (March 4, 1977) earthquake during this century (1574 people, including 1424 in Bucharest), Romania can be ranked the 3 rd country in Europe, after Italy and Turkey. Romania is followed by the former Yugoslavia and by the Greece (Bolt, 1995, Coburn and Spence, 1992). The World Bank loss estimation after the 1977 earthquake (Report No.P-2240-RO, 1978) indicates that from the total loss (2.05 Billion US $) more than 2/3 were in Bucharest, where 32 tall buildings collapsed. Half of the total loss was accumulated from buildings damage. The 1977 direct loss and indirect consequences of loss mark probably the starting point of economical decay of Romania during the next decade. They also explain the present concern of civil engineers and Romanian Government for assessment and reduction of seismic risk in Romania. The World Map of Natural Hazards prepared by the Münich Re, 1998 indicates for Bucharest: “Large city with Mexico-city effect”. The map focuses the dangerous phenomenon of long (1.6s) predominant period of soil vibration in Bucharest during strong Carpatians Vrancea earthquakes. The Bucharest and Lisbon are the only two European cities falling into Mexico- city category. Presently, international experts and organizations agreed that Bucharest is the capital city in Europe characterised by the highest seismic risk. The paper presents: Part I, Vrancea Seismic Hazard Assessment in Romania, 1.1 Subcustral Seismicity of the Vrancea Region; 1.2 Codes and standards for design of earthquake resistance of structures (1940 – 2000); 1.3 Seismic hazard assessment in the draft P 100 2003 seismic code of Romania. Part II, Seismic Risk Management, 2.1 The structure of the existing building stock in Bucharest; 2.2 Fragile residential buildings in Bucharest.

description

0151

Transcript of 0151

  • KEYWORDS: codes; damage score; vulnerability class; sesmic risk management

    1 THE STRUCTURE OF THE EXISTING BUILDING STOCK IN BUCHAREST

    The structure of the existing building stock in Bucharest is given in Figure 12 and Table 4. The Bucharest population is about 2 million inhabitants. It is almost constant during the last 10 years. Table 4. Inventory of existing housing units in Bucharest according to the periods of validity of various Romanian seismic codes.

    Seismic code inter- benchmark periods

    Housing units built during inter-benchmark periods

    % housing units built during inter-benchmark periods

    before 1941 168,556 21.95 ~22% 1941-1963 69,702 9.08 1963-1970 110,669 14.42 1970-1978 119,625 15.57 ~39% 1978-1992 292,594 38.09 1992-1995 6,844 0.89 ~ 39% Total 768,000 100%

    From Assessment of Seismic Hazard to Retrofitting of Most Fragile Buildings - Experience of Romania: Part II: Seismic Risk Management

    D. Lungu, A. Aldea, S. Demetriu and C. Arion National Institute for Building Research, Bucharest and Technical University of Civil Engineering, Bucharest

    ABSTRACT: According to the number of people lost in earthquakes during XXth century as well as in a single (March 4, 1977) earthquake during this century (1574 people, including 1424 in Bucharest), Romania can be ranked the 3rd country in Europe, after Italy and Turkey. Romania is followed by the former Yugoslavia and by the Greece (Bolt, 1995, Coburn and Spence, 1992). The World Bank loss estimation after the 1977 earthquake (Report No.P-2240-RO, 1978) indicates that from the total loss (2.05 Billion US $) more than 2/3 were in Bucharest, where 32 tall buildings collapsed. Half of the total loss was accumulated from buildings damage. The 1977 direct loss and indirect consequences of loss mark probably the starting point of economical decay of Romania during the next decade. They also explain the present concern of civil engineers and Romanian Government for assessment and reduction of seismic risk in Romania. The World Map of Natural Hazards prepared by the Mnich Re, 1998 indicates for Bucharest: Large city with Mexico-city effect. The map focuses the dangerous phenomenon of long (1.6s) predominant period of soil vibration in Bucharest during strong Carpatians Vrancea earthquakes. The Bucharest and Lisbon are the only two European cities falling into Mexico-city category. Presently, international experts and organizations agreed that Bucharest is the capital city in Europe characterised by the highest seismic risk. The paper presents: Part I, Vrancea Seismic Hazard Assessment in Romania, 1.1 Subcustral Seismicity of the Vrancea Region; 1.2 Codes and standards for design of earthquake resistance of structures (1940 2000); 1.3 Seismic hazard assessment in the draft P 100 2003 seismic code of Romania. Part II, Seismic Risk Management, 2.1 The structure of the existing building stock in Bucharest; 2.2 Fragile residential buildings in Bucharest.

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    Figure 12. Distribution of Bucharest buildings with period of

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    2 FRAGILE RESIDENTIAL BUILDINGS IN BUCHAREST

    The List of the vulnerable buildings built in the center of Bucharest before 1940 and identified as having highest risk of collapse in the case of strong earthquake (comparable to 1977 event) contains 115 fragile mid-rise and high-rise buildings (March 2001/ Jan. 2003).

    All those tall buildings listed as very vulnerable were located on the city map using the Geographic Information System (GIS) infrastructure, Figure 13 and Table 5.

    In so called Test area of central Bucharest the GIS map (1:500) contains the location and detailed information on the more than 1700 buildings. All those buildings represented on map were digitised at Karlsruhe University within the technical cooperation between Technical University of Civil Engineering Bucharest (UTCB) and Karlsruhe University in the frame of German Science Foundation Project 461 devoted to Vrancea earthquakes.

    The Test area in central Bucharest was selected by UTCB in 1997 based on location of the collapsed buildings during the 1977 earthquake in Bucharest.

    Presently, the central Bucharest test area was extended to about 24000 buildings within European RISK-UE Project at University of Civil Engineering Bucharest, (UTCB) for including majority of the building listed as seismically vulnerable in Bucharest.

    The damage score for the fragile building structures from the list of 115 buildings in Bucharest was computed with a simplified version of the damage methodology proposed by Gulkan (1994), Middle East Technical University, Ankara, Turkey.

    The calculation of damage score, SD for a building is based on the level of damage of the structural members at the most severely damaged story of the buildings (usually the groundfloor). The damage level of structural member is classified as follows:

    No damage MD score = 0 Moderate damage MD score = 2 Light damage MD score = 1 Extreme damage MD score = 4.

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    ArcView GIS 3.2 - ESRI CaliforniaLungu & Arion, 2000

    Figure 13. Central Bucharest area with buildings built prior to 1945 and identified as having high risk of collapse in case of a strong earthquake (Mw7.5)

    The importance factor for structural elements, is selected as follows (Gulkan, 1994): Columns =2; Beams =1; Infill masonry =0.5.

    The building structure damage score, SD can be computed as follows:

    ( ) ( ) ( )( ) ( ) ( )[ ] 1004 MDMDMDSD illsinfbeamscolumns illsinfbeamscolumns ++

    ++=

    SD varies from 0 to 100. The vulnerability classes can be selected based on SD score.

    The simple criteria might confirm the hierarchy of actual vulnerability of the fragile buildings in

    Bucharest in the case of a strong earthquake: (i) Presence of visible damage after the 1977 earthquake as well as the presence of

    visible local repairing made after that earthquake; (ii) Presence of the soft ground floor due to commercial use of that floor (no infilled

    masonry walls); (iii) Number of storeys of building (taller the building, higher the risk); (iv) Lack of vertical and horizontal symmetry of the building (setbacks, asymmetrical

    architecture of the corner buildings) as well as unintended local structural damage due to occupancy changes and activities, corrosion of the reinforcement, low strength concrete (mean compressive strength 100-200 daN/cm2). etc.

  • Table 5. Buildings with more than 5 stories built before 1940 located on the two most important boulevards of central Bucharest and identified as having highest risk of collapse in case of strong

    (comparable to 1977) earthquake

    Classification of damage in 1977 follows vulnerability classes of HAZUS methodology, 1998, (see Lungu, D.,

    et al., 2000. Advanced Structural Analysis, Conspress, UTCB, 177p.);

    No Address

    Year of building

    construction

    Commercial occupancy of groundfloor

    Storeys No. of Apt.

    Total area sqm.

    Damages after the 1977 earthquake in structural

    elements

    Repairing work after the 1977 earthquake

    Gulkan Damage

    score

    1 Balcescu 24 (Pherekide) 1928 Yes 13 61 12197 Columns: Beams : Masonry:

    Extreme Extreme Extreme

    Jacketing of columns and beams

    Masonry Repairs Epoxy resins injections

    Mortar injections Finishes

    100

    4 Calea Victoriei

    101 A-B

    1937 Yes 11 61 6111 Columns: Beams : Masonry:

    Extreme Extreme

    -

    Jacketing of columns Masonry Repairs

    Epoxy resins injections 86

    6 Magheru 20 1935 Yes 10 52 5484 Columns: Beams : Masonry:

    - Light Light

    Masonry Repairs Epoxy resins injections

    Mortar injections 11

    11 Magheru 27 1935 Yes 9.5 36 6405 Columns: Beams : Masonry:

    Light - -

    Jacketing of columns 14

    12 Calea Victoriei 2-4 1928 Yes 9 76 12994 Columns: Beams : Masonry:

    Light Medium

    -

    Masonry Repairs 29

    16 Calea Victoriei 128A 1935 Yes 9 22 6675 Columns: Beams : Masonry:

    Extreme Extreme Extreme

    Jacketing of columns and beams

    Masonry Repairs 100

    20 Calea Victoriei 112 1939 Yes 9 27 5210 Columns: Beams : Masonry:

    Extreme Extreme Extreme

    Jacketing of 4 columns Masonry Repairs

    Epoxy resins injections

    100

    27 Calea Victoriei 208 1940 Yes 8.5 44 5200 Columns: Beams : Masonry:

    Extreme Medium Extreme

    Jacketing of beams Masonry Repairs

    Epoxy resins injections 86

    30 Calea Victoriei 139 1934 Yes 8 30 1290 Columns: Beams : Masonry:

    Light Light

    Medium

    Masonry Repairs

    29

    61 Balcescu 25 (Wilson) 1928 Yes 12 93 12287 Columns: Beams : Masonry:

    Extreme Extreme Extreme

    Jacketing of columns and beams

    Masonry Repairs Epoxy resins injections

    Mortar injections Finishes

    * partially collapsed in 1977

    105

    65 Calea Victoriei 124 1900 Yes 6.5 28 3045 Columns: Beams : Masonry:

    - -

    Light/ Medium

    Masonry Repairs 37

    91 Calea Victoriei 25 1936 Yes 13 49 6078 Columns: Beams : Masonry:

    Extreme Extreme Extreme

    Jacketing of 6 columns Epoxy resins injections

    100

    92 Calea Victoriei 95 1938 Yes 10.5 51 4010 Columns: Beams : Masonry:

    Extreme Extreme Extreme

    Jacketing of columns and beams

    100

    94 Balcescu 32-34 1935 Yes 10 41 6996

    Columns:

    Beams :

    Masonry:

    Light/ Medium Light/

    Medium -

    Masonry Repairs 42.5

    95 Balcescu 30 1936 Yes 9.5 25 2756 Columns: Beams : Masonry:

    Extreme -

    Medium

    Masonry Repairs Epoxy resins injections

    Finishes 64

    100 Balcescu 7 1933 Yes 7 15 2730 Columns: Beams : Masonry:

    Light Light

    Extreme

    Masonry Repairs Epoxy resins injections

    36

    104 Calea Victoriei 33-35 1930 Yes 6.5 39 4800 Columns: Beams : Masonry:

    Medium Medium Medium

    Jacketing of columns Masonry Repairs

    50

  • Balcescu 24(Pherekide) Calea Victoriei 101 A-B Magheru 20

    Magheru 27 Calea Victoriei 2-4 Calea Victoriei 128A

    Calea Victoriei 112 Calea Victorie 208 Calea Victoriei 139

    Balcescu 25 (Wilson) Calea Victoriei 124 Calea Victoriei 25

  • Calea Victoriei 95 Balcescu 32-34 Balcescu 30

    Balcescu 7 Calea Victoriei 33-35

    Figure 14 Seismic vulnerability class 1

    buildings on the most important two boulevards in central

    Bucharest

    Table 5 and Figure 14 give the characteristics and the photos of 17 buildings seismic vulnerability class 1 located on the two most important boulevards of Bucharest. All of them were built before WWII (1940).

    Seismic "risk class in present Romanian seismic code (P100-92) is actually seismic vulnerability class!

    That is why the seismic risk matrix presented in Table 6 should be used for the classification of actual seismic risk of vulnerable buildings in Romania.

    Table 6 Seismic risk classes

    Importance and exposure class Seismic Vulnerability/or

    fragility class

    I Essential facilities

    II Hazardous buildings

    III General buildings

    IV Minor buildings

    1 1 1 1&2 3 2 1&2 2 3 3 3 3

    Recently (Dec 2002/Jan 2003), 42 pre-1977 buildings built during the time interval 1945- 1977

    were included into the most dangerous seismic vulnerability class 1 buildings in Bucharest, Table 7 and Figure 15.

    They are tall RC buildings characterised by soft groundfloor located on soft soil condition of Bucharest city.

  • Table 7. Fragile tall RC buildings having flexible groundfloor, built prior to 1977 earthquake in Bucharest

    No. Name of street No. of buildings No. of stories Address of buildings

    1

    Calea Grivitei

    18

    B*+GF+ (7......12)S No. 3-5, 134, 139, 148, 156, 158, 163, 164, 169, 196, 198, 200, 206, 236, 238, 395, 398, 399

    2 Stefan cel Mare 11 B+GF+ (6...8)S No. 5, 15. 17, 27, 28, 31, 33, 40, 42, 128, 188 3 Bd. Mihalache (1 Mai) 4 B+GF+(8...10)S No. 170, 172, 174, 399 4 Gara de Nord 3 B+GF+8S No. 2-4, 6-8, no.2 Piata 5 Dinicu Golescu Bd., 1 B+GF+9S No. 23-25 6 Piata Chibrit C 1 B+GF+8S 7 Piata Amzei 1 B+GF+7S No. 12-22 8 Bd. N. Balcescu 1 B+GF+9S No. 33

    9 Dorobanti/Stefan cel Mare corner 1 B+GF+12S Blocul Perla

    10 Sos. Mihai Bravu, 1 B+GF+8S No. 107-119 * B basement. GF groundfloors, S - stories

    Figure 15. Fragile tall RC buildings having flexible groundfloor, built

    prior to 1977 earthquake in Bucharest

    Various orthodox churches damaged by major historical earthquake in Bucharest are listed in Table 9 and in Figure17.

  • Table 8. List of cities with hospital buildings requiring strengthening work

    Hospitals requiring technical assessment and retrofitting works (design, construction, financing) in various Romanian counties are listed in Figure 16 and Table 8.

    Table 9 Churches damaged by major historical earthquakes in Bucharest

    Level of damage No. Name Address 1802

    event 1838 event

    1940 event

    1977 event

    1 Manastirea Plumbuita, de la Podul Colentinei Str. Plumbuita 58 severe

    2 Manastirea Marcuta Str. Gentianei din Sos. Pantelimon severe

    3 Doamnei (fosta manastire) Intr. Bis. Doamnei 3, Calea Victoriei 28 medium

    4 Sf. Gheorghe-Nou Bd. Bratianu 27 medium 5 Manastirea Antim Str. Mitropolitul Antim Ivireanu 29 light 6 Sf. Elefterie-Vechi Str. Sf. Elefterie 15C medium medium 7 Oborul-Vechi Str. Traian 204 medium medium 8 Sf. Pantelimon Str. Iancu Capitanu 24 severe 9 Popa Rusu Str. Popa Rusu 13-17 medium

    10 Precupetii Noi Str. G-ral Ernest Brosteanu 12 medium 11 Doamna Ghica-Tei Str. Doamna Ghica 2 medium

    12 Manastirea Sf. Spiridon-Nou Calea Serban Voda 29 medium

    13 Sf, Nicolae Tabacu Calea Victoriei 180 medium medium

    14 Sf. Nicolae-Selari Str. Blanari 16 / Intr. Selari collapse

    15 Sf. Mina (Vergului) Str. C. F. Robescu 18A medium

    16 Herastrau-Sfintii Apostoli Petru si Pavel Str. Nicolae Caranfil 28 medium

    17 Dobroteasa Bd. Mircea Voda 35B medium 18 Amzei Str. Biserica Amzei 12 light medium

    19 Biserica si Scoala Sf. Silvestru Str. Silvestru 36 medium

    20 Boteanu (cu Bradu) Str. Boteanu 8 medium severe

    21 Popa Nan Str. Popa Nan 47 bis si Str. Gh. Costa-Foru 5 severe severe

    22 Sfantul Apostol Andrei-Chitila II Sos. Chitilei 138 severe

    23 Aparatorii Patriei II Str. Lunca Barzesti 3 medium

    Number of hospitals buildingsCitySeverely damaged.

    Requiring immediatetechnical assessment

    Having atechnical

    report

    Approvedproject forretrofitting

    Retrofitting inwork

    Bacau 3Bucharest 13 16 6 10Buzau 9Constanta 7Craiova 4Focsani 2Galati 6 2 1Giurgiu 1Iasi 21 17 2 5Pitesti 2 7Ploiesti 2Sibiu 1Targu-Mures

    2

    Vaslui 4 1Barlad 2

  • Figure 16

    Figure 17

    There is a certitude that, for about 50 years recurrence interval Vrancea earthquake, several

    dozens of pre-WWII tall RC buildings in Bucharest will collapse (there are about 60-100 pers/bldg). More than half of those buildings and several pre - 1977, framed RC structures in are already identified by licensed experts as seismic risk class 1 buildings.

    The governmental action of identification of dangerous buildings in Romania started in 1994. In 2001, a new Government Order stated that the Government will 100% advance the necessary

    payment, for strengthening of the buildings, to the private owners of apartments in seismic risk class 1 buildings (more than 95%of housing units are private in Romania!).

    If the owner salary is less then national average, he have to pay back(to the state) nothing. If it is not, he has to pay the money back in 25 years, with 5% interest.

    Anyway, the owner has to agree on the strengthening of its apartment, in case he has to leave the housing unit during the construction work.

    Of course, the owners do not like leaving and the necessity buildings for temporary housing during strengthening are not yet implemented.

  • Moreover, if one apartment owner does not like/agree on strengthening of its apartment, the strengthening of the whole building can not be done!!!

    There is a promise of the Ministry of Public Works, during a May, 2003 Seminar, for promoting a new official act which will make compulsory the strengthening of the building structure if the majority of private owners will accept the strengthening(in spite of several owners who would not like to allow strengthening of their apartments).

    Distribution per counties of residential buildings, hospital buildings and school buildings, requiring strengthening/retrofitting works in Romania is presented in Figure 18.

    Present stage of construction work of the first 8 buildings under retrofitting/strengthening in Bucharest is give in Table 10.

    Table 10.

    Building 1 2 3 4 5 6 7 8

    Total area (sqm) 6050 1831 1615 1750 12313 2013 3706 2271

    Height B+GF+8S B+GF+6S B+GF+6S B+GF+6S B+GF+11S B+GF+5S B+GF+8S B+GF+5S 1 ) Present stage of retrofitting work, 2070%; 2) Cost of structure strengthening 50 - 150/ sqm, 3) Duration of construction, 812 month

    Figure 18

    3 CONCLUSION

    There is nothing more important in Seismic Risk Management then Strengthening of the most vulnerable/fragile buildings, damaged by post earthquake or to be severely damaged by the next strong earthquake.

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