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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

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Undergraduate seismic design competition -2013

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  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

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