Issue Date: 3-Apr-2011 Type: Presentation Abstract: Comparison of risks between those from low-rise and high-rise buildings in Bangkok during earthquake URI: http://dspace.siu.ac.th/handle/1532/1245

1. Systematic Problem Solving & Decision Making
Train-the-Trainer Workshop
Low-rise vs. Tall Buildings:
What is Safer during
Earthquake in Bangkok?
Dr. Thiti Vacharasintopchai
thitiv@{siu.ac.th, alumni.ait.ac.th}
April 3, 2011

2. Outline
• What happens during Earthquake?
• Seismic Hazard Maps
– PGA : Peak Ground Accelerations
• Newton’s Second Law
– Total force applied on a body is equal to the time derivative of linear
momentum of the body.
• Structural Dynamics
– Vibrations, Natural Frequencies, Mode Shapes
• Typical Design of Low-rise vs. Tall Buildings
• The Bangkok Soft Clay
• Conclusion
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3. What happens during Earthquake?
http://www.civilengineergroup.com/wp-content/
uploads/2010/12/seismograph.gif
http://www.tulane.edu/~sanelson/images/sgraph.gif
http://en.wikipedia.org/wiki/P-wave
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4. Seismic Hazard Maps
http://www.bangkokpost.com/media/content/20110326/249115.jpg http://www.crew.org/science/pgaall.html 4

5. Newton’s Second Law
• Total force applied on a body is equal to the time derivative of
linear momentum of the body.
http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion 5
http://articles.architectjaved.com/earthquake_resistant_structures/files/2010/06/deformation.jpg

6. Structural Dynamics
• Vibrations, Natural Frequencies, Mode Shapes
http://www.tulane.edu/~sanelson/images/sgraph.gif
http://www.wbdg.org/images/seismic_7.gif
http://www.structuremag.org/images/1107-bb-1.gif
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7. Typical Design of Low-rise vs. Tall Bldgs
Tall Buildings
http://www.gpsworld.com/files/gpsworld/nodes/2003/3396/chart1.jpg
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8. Characteristic of The Bangkok Soft Clay
http://upload.wikimedia.org/wikipedia/en/thumb/e/ea/
Bangkok_microzonation_map.jpg/300px-Bangkok_microzonation_map.jpg
Mexico City 1985
http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/
IntroQuakes/Notes/Images_specific02/
site_amplification.gif Resonance with
10-story Buildings
http://www.smate.wwu.edu/teched/geology/GeoHaz/eq-Mexico/eq-Mexico-08.JPG
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9. “Present” Tall Buildings are Safer
during Earthquake in Bangkok?
Structural Upgrade
Business Opportunity
CONCLUSION
Thanks to Google Images
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