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SBST – Core elective: Earthquake Resistant Construction Semester VI

SBST – Core elective: Earthquake Resistant Construction Semester VI. Chandra Bhakuni -0594. During the semester. Introductions Basics of earthquakes History of earthquakes and damaging earthquakes Understanding seismic exposure and loss assessment

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SBST – Core elective: Earthquake Resistant Construction Semester VI

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  1. SBST – Core elective: Earthquake Resistant ConstructionSemester VI Chandra Bhakuni -0594

  2. During the semester • Introductions • Basics of earthquakes • History of earthquakes and damaging earthquakes • Understanding seismic exposure and loss assessment • Seismic analysis; and design and detailing (RCC and Masonry)

  3. Basics of Earthquakes Movement of Body Earth diameter — 12,742 km

  4. Basics of Earthquakes Plate Tectonics - a theory -

  5. Basics of Earthquakes Plate Tectonics wikipedia

  6. Basics of Earthquakes Plate Tectonics • http://www.abag.ca.gov/bayarea/eqmaps/fixit/ch2/sld003.htm

  7. Basics of Earthquakes Plate Tectonics • http://www.abag.ca.gov/bayarea/eqmaps/fixit/ch2/sld004.htm

  8. Basics of Earthquakes • Release of energy from earth’s crust • Type of Waves • Body Waves (P wave & S wave) • Surface Waves • Rayleigh waves

  9. Basics of Earthquakes Seismic Hazard Global Seismic Hazard Assessment Program (GSHAP) - 1992

  10. Basics of Earthquakes India Seismic Risk Zones Bureau of Indian standards IS 1893 (Part 1) - 2002 http://www.iitk.ac.in/nicee/EQTips/EQTip04.pdf

  11. Basics of Earthquakes • Branch of Structural Dynamics Simplified SDOF ‘equation of motion’ f(t) = ma + kt + cu Or’ f(t) = cu + ků + mϋ F = Shear Force m = Mass k = Stiffness c = damping coefficient a = acceleration T = time period U = displacement

  12. Basics of Earthquakes Single degree of freedom (SDoF) oscillator Natural Frequency, fn, Where,fn = Natural Frequency (Hertz ) or (No. of Cycles/Second)k = Element Stiffness (N/m)m = Element Mass (kg) Radian frequency, ωn = 2π fn

  13. Basics of Earthquakes History of Earthquakes Some Big Reported events in last 10 years 2010 04 13 - Southern Qinghai, China - M 6.9Fatalities 2,968 2010 01 12 - Haiti region - M 7.0Fatalities 222,570 2009 09 30 - Southern Sumatra, Indonesia - M 7.5Fatalities 1,117 2008 05 12 - Eastern Sichuan, China - M 7.9Fatalities 87,587 2005 10 08 - Pakistan - M 7.6Fatalities 86,000 2004 12 26 - Sumatra-Andaman Islands - M 9.1Fatalities 227,898 2003 12 26 - Southeastern Iran - M 6.6Fatalities 31,000 2001 01 26 - Gujarat, India - M 7.6Fatalities 20,023 http://earthquake.usgs.gov/earthquakes/world/historical.php

  14. Next Class • History of earthquakes and recording • Assignment

  15. Assignment Explore one interesting point in the history of earthquakes Find the oldest event One page only Submit next week

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