1 / 22

Undergraduate seismic design competition -2013

Undergraduate seismic design competition -2013. EERI Student Chapter – Rice University. Topic #1: Basic Earthquake Engineering Concepts. What happens during an Earthquake?. Ground motion characteristics: How long? How strong? Frequency content? Building response: Strong vibrations

slade-mcbride
Télécharger la présentation

Undergraduate seismic design competition -2013

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Undergraduate seismic design competition -2013 EERI Student Chapter – Rice University Topic #1: Basic Earthquake Engineering Concepts

  2. What happens during an Earthquake? • Ground motion characteristics: • How long? • How strong? • Frequency content? • Building response: • Strong vibrations • Large stresses and strains • Local Failure • Many local Failures  Progressive Collapse  Building Collapse

  3. Basic Design Concepts #1 ‘Soft-story’ formation • Avoid ‘soft-story’ ground floors! • Maintain uniformity throughout height • Provides braces at all storeys

  4. Basic Design Concepts #2 ‘Soft-story’ formation • Avoid ‘soft-story’ upper floors! • Maintain uniformity throughout height • Provides braces at all storeys

  5. Basic Design Concepts #3 Building Top View Building Front View Non-symmetric Bracing Bracings Symmetric Bracing Avoid non-symmetric bracing!

  6. Basic Design Concepts #4 Avoid discontinuities is stiffness and resistance

  7. Basic Design Concepts #5 • Provide slender structural walls! • Structural walls along principal directions • Be as symmetric as possible

  8. Basic Design Concepts #6 • Avoid short column! • Short columns often fail in shear

  9. Basic Design Concepts #7 Protect your foundations!

  10. Basic Design Concepts #8 Strong column weak beam theory!

  11. Basic Design Concepts #9 • Avoid resonance! • We will need this at the analytical/computer model building stage • We have to check and confirm that dominant earthquake frequency and building frequency are different to avoid resonance • Mention this point in the proposal!!

  12. Basic Design Concepts #9 • Bracings and damping devices • Will be covered tomorrow!

  13. Topic #2: Structural Systems for Tall Buildings

  14. Tall Buildings • Skyscraper is the greatest architectural invention of America • Steel frame structure for the 1st time used in England in 1792

  15. Problem of Size • Increase in size: reduction in strength • The Euler buckling of the columns • Cannot directly employ the existing models and magnify them

  16. Imhotep to FazlurRahman Khan • "Einstein of structural engineering" • His "tube concept," using all the exterior wall perimeter structure of a building to simulate a thin-walled tube, revolutionized tall building design

  17. Structural Systems

  18. Example of Bundle Tubes

  19. Truss Tube Mode shapes

  20. Connections • Optimum seismic connection

  21. Failure Mechanism

  22. Failure Mechanism

More Related