SBST – Core elective: Earthquake Resistant Construction Semester VI Chandra Bhakuni -0594.

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Presentation transcript:

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 Seismic analysis; and design and detailing (RCC and Masonry)

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Basics of Earthquakes Plate Tectonics

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

Basics of Earthquakes Seismic Hazard Global Seismic Hazard Assessment Program (GSHAP)

Basics of Earthquakes India Seismic Risk Zones Bureau of Indian standards IS 1893 (Part 1)

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

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

Basics of Earthquakes History of Earthquakes Some Big Reported events in last 10 years Southern Qinghai, China - M Southern Qinghai, China - M 6.9 Fatalities 2,968Fatalities 2, Haiti region - M Haiti region - M 7.0 Fatalities 222,570Fatalities 222, Southern Sumatra, Indonesia - M Southern Sumatra, Indonesia - M 7.5 Fatalities 1,117Fatalities 1, Eastern Sichuan, China - M Eastern Sichuan, China - M 7.9 Fatalities 87,587Fatalities 87, Pakistan - M Pakistan - M 7.6 Fatalities 86,000Fatalities 86, Sumatra-Andaman Islands - M Sumatra-Andaman Islands - M 9.1 Fatalities 227,898Fatalities 227, Southeastern Iran - M Southeastern Iran - M 6.6 Fatalities 31,000Fatalities 31, Gujarat, India - M Gujarat, India - M 7.6 Fatalities 20,023Fatalities 20,023

Next Class History of earthquakes and recording Assignment

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