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Post-Earthquake Assessment of Buildings Connecting Database Compilation, Mobile Data Transmission and GIS Visualization

Building Damage Assessment after 2015 gorkha earthquake

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Post-Earthquake Assessment of Buildings Connecting Database Compilation, Mobile Data Transmission and GIS Visualization

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  1. Post-Earthquake Assessment of Buildings Connecting Database Compilation, Mobile Data Transmission and GIS Visualization USMCA2015 The 14th International Symposium on New Technologies for Urban Safety of Mega Cities in Asia October 29-31, 2015 Radisson Hotel, Kathmandu, Nepal Sujan Raj Adhikari, GopiKrishna Basyal, Surya Narayan Shrestha, SumanPradhanNational Society for Earthquake Technology – Nepal

  2. Gorkha Earthquake, 2015 • 25th April, 2015, at 11:56 local time, 7.6 magnitude earthquake with the epicenter in Barpak, Gorkha District, 80 km northwest of Kathmandu • Gorkha Earthquake was followed by thousands of aftershocks including M6.6 and M6.7 within 24 hours and Mw7.3 (ML6.7, Department of Mines and Geology) on 12 May 2015 which caused additional damage and casualties.

  3. GorkhaEarthquake, 201541 Municipality, >400 VDC Deaths: 9,256 Injury: 22,326 Affected Population: 8 million Building Damage: 513,411 Source: NPC,2015 Data: As of May 21, 2015

  4. Housing located in different zones will be damaged differently Different types of buildings will be damaged differentlydue to different construction, materials and techniques

  5. Building Damage Assessment • Tentative Estimation of building damage • To understand Failure Patterns • To identify Damage Grades Damage Stone Masonry Tilting of RC frame

  6. General Building Information • Use1.a residence 1.d commerce • 1.b office 1.e factory • 1.c school 1.f hospital • 2. Type 2.a stone, adobe 2.d reinforced concrete 2.b masonry/wooden roof 2.e steel structure • 2.c masonry/concrete roof • 3. Damage 3.a no damage 3.dHeavy damage, • 3.bSlight damage 3.eVery Heavy damage3.cModerate damage 3.g Destruction • 4. Plan 4.a square 4.c L-shaped • 4.b rectangular 4.d complex • 5. Soil5.a soft 5.c rock • 5.b hard 5.d sloping • 6. Photographs

  7. Google Earth Imaginary Chautara Municipality Sundhupalchok District

  8. Google Earth Imaginary field paper Chautara Municipality Sundhupalchok District

  9. Guideline for Detail Damage Assessment Refer post disaster damage assessment guidelines published by DUDBC to develop the questionnaires for assessment

  10. Mobile Technology in data collection Section A contains building identification data (id, city, address, ownership, no of resident etc.), Section B contains building technical characteristic (no of stories, age of building, primary occupancy etc.), Section C contains geotechnical hazard, Section D contains data related to the structural type Section E contains Damage grade, recommendations and building Photographs

  11. Building Digitization on Google Earth

  12. Linking database Building Digitization Google Earth GIS Map Field Paper Mobile Data Excel Data

  13. Outcome

  14. Outcome Building Typology VS Damage Grade

  15. Outcome Building Typology VS Recommendation

  16. Outcome

  17. take-home message • Proper utilization of technologies will help to collect pre and post-disaster information in short span of time. • This study will mentor ChautaraMunicipality to differentiate the building which are possible to repair/ retrofit and which needs to be demolish. • This study positively support the government to developed reconstruction strategy plan.

  18. Thank you for your time and attention.

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