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Structural Engineering Issues for a Large Cascadia Event

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)

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Structural Engineering Issues for a Large Cascadia Event

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  1. Structural Engineering Issues for a Large Cascadia Event

  2. 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

  3. 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) Fire Rahman and Mashfiq, ADPC

  4. Build Case for Investment HAZUS-MH 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.

  5. 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

  6. 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?

  7. Key Issues Building stock • No shake out Fragility Curves for PBE Need input motions • Real and synthetic Current Codes Adequate for New Design? Retrofit Methods for Existing Stocks High performance materials ($) Hybridized designs Tsunami Tsunami after Seismic

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