College of Engineering
Pune (COEP)
EARTHQUAKE ANALYSIS OF
HOSPITAL BUILDING USING ETABS
Project Guide:
Dr. S.N. Madhekar
Ajinkya Admuthe
Ajinkya Deoskar
Amol Bharati
Juhi Karwa
Sandeep Bora
Saurabh Badjate
Monday December 3
2012
1
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2015/2016
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College of Engineering
EARTHQUAKE ANALYSIS OF HOSPITAL BUILDING USING ETABS Project Guide: Dr. S.N. Madhekar
Ajinkya Admuthe
Ajinkya Deoskar
Amol Bharati
Juhi Karwa
Sandeep Bora
Saurabh Badjate
Monday December 3 2012 1
College of Engineering
Pune (COEP)
CONTENTS OF PRESENTATION
- (^) Introduction to earthquakes
- (^) Methods of analysis
- (^) Introduction of project(hospital building)
- (^) Motivation behind this project and reason for Etabs
- (^) Analysis on Etabs
- (^) Evaluation of results
- (^) Future work to be done Monday December 3 2012
College of Engineering
PLATE TECTONICS THEORY Monday December 3 2012 2
- The Epicentres of earthquakes are not randomly distributed over the earth’s surface
- They tend to be concentrated in narrow zones, about 99 % of them being concentrated in inter plate zones of seismic activity
- Remainder 1 % considered to be Aseismic
- About 90 per cent earthquakes result from tectonic plate movements
- Rest can be related to volcanic activities, collapse of sub terranean cavities or man made effects such as nuclear explosions
- Tectonic earthquakes are triggered when accumulated strain exceeds shearing strength of rocks
College of Engineering
Seismotectonics of India Monday December 3 2012 5
College of Engineering
EXAMPLES
- (^) L Monday December 3 2012 7
Latur earthquake
Bhuj earthquake
College of Engineering
EXAMPLES Monday December 3 2012 8
Bihar earthquake
Koynanagar earthquake
College of Engineering
Pune (COEP)
METHODS OF ANALYSIS
- (^) Seismic coefficient method
- (^) Response spectrum method
- (^) Time history method Monday December 3 2012
College of Engineering
Response Spectrum Method Monday December 3 2012 11
College of Engineering
Pune (COEP)
- (^) The equation for multi-degree, undamped free vibration system is given by : mῢ + ku = 0 or [m] {ῢ} + [k] {u} = 0
- (^) As the mass is assumed to execute simple harmonic motion, the solution is given by: [K-ὠ
2 m] Φ n = 0
For non-trivial solution,
Det ǀK-ὠ2 mǀ = 0
The solution of equation given N roots representing the frequencies of N modes of
vibrations.
Monday December 3 2012
TIME HISTORY METHOD Monday December 3 2012
College of Engineering
Monday December 3 2012 16 SEISMIC COEFFICIENT METHOD
College of Engineering
FACTORS AFFECTING SEISMIC GROUND VIBRATIONS Monday December 3 2012 17
- Magnitude of EQ
- Depth of Focus
- Distance from Epicentre
- Characteristics of the Path through which seismic waves travel
- Soil strata on which the structure stands
College of Engineering
DESIGN PROCEDURE Monday December 3 2012 19 According to IS 1893
- (^) The design seismic force is given by, V=A
h x W
Where W: Seismic Weight of Floors DL + % of LL
Ah = Z/2 x I/R X Sa/G
- (^) Design lateral force:
Qi = (Vb) * (Wi * hi^2)/(Σ Wi * hi^2)
College of Engineering
- (^) Dynamic analysis using either Time History Method or Response Spectrum Method shall be performed for the following buildings. Regular buildings: These buildings having height greater than 40m in zone IV and V, and those are greater than 90m height in zone II and III. Irregular buildings All buildings higher than 12m in zone IV and V, and those greater than 40m in height zone II and III. However, for irregular buildings having height less than 40m in zone II and III, even though not mandatory, dynamic analysis is recommended. Monday December 3 2012 20 Remarks on selection of method