SLIDE 1
Introduction to Seismic Essentials in Groningen
5.3
By Prof Joop Paul MSc PhD – TU Delft / Arup
Lateral Load Resisting System Design – Part 2
Introduction to Seismic Essentials in Groningen Lateral Load - - PowerPoint PPT Presentation
Introduction to Seismic Essentials in Groningen Lateral Load - - PowerPoint PPT Presentation
Introduction to Seismic Essentials in Groningen Lateral Load Resisting 5.3 System Design Part 2 By Prof Joop Paul MSc PhD TU Delft / Arup Seismic Design Principles 1. Use ductile materials 2. Connect all the building elements 3.
SLIDE 2
SLIDE 3
Seismic Design Principles
- 1. Use ductile materials
- 2. Connect all the building elements
- 3. Minimize mass and mass/strength ratio
- 4. Minimize eccentricities and plan irregularities
- 5. Minimize discontinuities and vertical irregularities
- 6. Ensure energy absorption by designing for ductile failure mechanisms
- 7. Design multiple lateral load paths
SLIDE 4
Use ductile materials
Brittle materials Ductile materials bigger smaller sudden not sudden Member size Failure mode limited significant Energy absorption Example masonry steel
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Connecting all building elements
- Sliding off possible
Friction connections Positive connections Design connections
- No separation possible
- Connection is stronger
than incoming members member connection
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Minimize mass
and optimize vertical mass distribution
facade separation walls roofs floors water storage storage
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Minimize mass
Optimize strength/mass ratio
Strength/mass ratio
Steel Timber Concrete Masonry
SLIDE 8
Minimize eccentricities
Centre of mass
SLIDE 9
Minimize eccentricities
Centre of resistance
SLIDE 10
Minimize eccentricities
Torsional shaking
shaking in x-direction shaking in y-direction Torsional moment = y y x x CoR CoR CoM CoM ey Fx Fy ex
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Minimize eccentricities
Designing for torsion
not good
- k
better
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Minimize plan irregularities
CoR CoM
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Minimize discontinuities
Discontinuity in stiffness
not good
- k
h h h h h h
SLIDE 14
Minimize discontinuities
Discontinuity in mass and stiffness
not good not good
- k
h h h h h h h h 1,5h
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Minimize discontinuities
Discontinuity in mass and stiffness
not good not good
- k
SLIDE 16
Minimize discontinuities
Podium buildings
not good
- k
- k
tower pinned on flexible columns podium separation of tower and podium
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Ensure energy absorption
Predictable ductile failure mechanisms
mechanism 1 mechanism 2 mechanism 3 affected = not good affected = not good not affected = good weak beam strong column
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Ensure energy absorption
Design of “plastic” fuses
F F portal braced frame excentric braced frame local bending deformation local axial deformation local bending + shear deformation
SLIDE 19
excentric braced frame detail
Ensure energy absorption
Design of “plastic” fuses
F F portal detail braced frame detail moment capacity axial capacity shear capacity
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Design multiple lateral load paths
not redundant = not good redundant = good more redundant = better
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Design multiple lateral load paths
not redundant = not good redundant = good more redundant = better
SLIDE 22
Seismic Design Principles
- 1. Use ductile materials
- 2. Connect all the building elements
- 3. Minimize mass and mass/strength ratio
- 4. Minimize eccentricities and plan irregularities
- 5. Minimize discontinuities and vertical irregularities
- 6. Ensure energy absorption by designing for ductile failure mechanisms
- 7. Design multiple lateral load paths
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Thank you for your attention!
SLIDE 24
5.3
References and further reading
Charleson, A. (2008). Seismic Design for Architects - outwitting the
- quake. Published by Routledge – Architectural Press.