Structural Engineering Issues for a Large Cascadia Event.
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Transcript of Structural Engineering Issues for a Large Cascadia Event.
Overview
•Need a Framework and Methods for Structural Hazard
Assessment Under Long-Duration Motions
•Many Knowledge Gaps and Data Needs
•Two Zones• Coastal (intensity and tsunami
post-earthquake)
• Valley (attenuated motions and site specific responses)
Swiss Agency for Development and Cooperation
Seismic Hazard Analysis for Long-Duration Motions
• Event scenarios (fault rupture, magnitude)
• Attenuation (changes over distance)
• Site specific responses (local shaking, soil behavior)
• Structural fragility (how building responds to shaking)
• Performance (damage/collapse)
•FireRahman and Mashfiq, ADPC
Build Case for Investment
Predicts:
•Physical damage to residential and commercial buildings, schools, critical facilities, and infrastructure;
•Economic loss, including lost jobs, business interruptions, repair and reconstruction costs; and
•Social impacts, including estimates of shelter requirements, displaced households, and population exposed to scenario floods, earthquakes, and hurricanes.
HAZUS-MH
Building Inventory•Oregon • Growth prior to hazard
recognition (and after!)• Unengineered buildings• Foundations• Reinforced concrete and
masonry• UR masonry • Discontinuities• Large Openings• Soft stories• Short columns• Torsional eccentricities• Elevation and plan stiffness
changes• Parapet walls• Pounding
Fragility Curves for Building Inventory•Describes Damage to Building as Function of Input (PGA)• Slight damage to
collapse• Statistical Functions• Unengineered
buildings • Foundations?• New ones needed• PGA adequate
parameter? •Optimistic?