design strength factors that account for basin e ects

University of Washington / Nasser Marafi, Jeffrey Berman, Marc Eberhard, Erin Wirth United States Geological Survey / Arthur Frankel INTRODUCTION CONCLUSIONS Design Strength Factors that Account for Basin Eff ects during Subduction Zone Earthquakes EFFECTS ON DURATION - Subduction earthquake recordings are from four deep basins in Japan. - Recordings are extracted from the K-NET and KiK-Net database. COLLAPSE FRAGILITIES This research was funded by the National Science Foundation under award number EAR-1331412. The computations were facilitated through the use of advanced computational, storage, and networking infrastructure provided by the Hyak supercomputing system at the University of Washington. Generate Broadband Motions Physics-based Simulations using High-Performance Computers Seismic Wave Velocity Model Puget Lowland Basin Tualatin Basin NIGATTA BASIN YUFUTSU BASIN KONSEN BASIN KANTO BASIN BASIN EFFECTS ON SPECTRAL ACCELERATION - Basin amplification factors are computed using the ratio of GMPE residuals of inside-to-outside basin recordings. - Residuals are computed using the 2016 BC-Hydro Subduction GMPE. PUGET LOWLAND BASINS - Deep sedimentary basins tend to increase the intensity of earthquake ground motions. - Basin amplifications on spectral acceleration are not directly included in the seismic hazard maps used in U.S. building codes. - The Pacific Northwest has several deep basins (Seattle, Tacoma, and Tualatin basin) and the potential for large- magnitude subduction earthquakes. - Simulating M9 earthquakes from the Cascadia Subduction Zone. - Comparing physics-based ground-motion simulations with earthquake recordings from similar tectonic environments and basins with similar properties. Period Dependent Max. Amplifications ≈3 @ 7s Stiff-soil and rock stations Magnitude Independent EFFECTS ON SPECTRAL SHAPE More Damaging Spectral Shapes Longer Inside Basin Motions DESIGN FACTORS Reduction in Collapse Capacity Accounts for the Effect of Duration and Spectral Shape Accounts for the Effect of Basin Amplification on Spectral Acceleration Kanto’s Max. Amplifications are at Shorter Periods ONGOING RESEARCH Large Variability P-Delta Column Lumped Plasticity 8-Stories, T n =1.8s Archetype by Haselton et al. 2011 - Ground motions recorded inside basins have (1) larger spectral accelerations, (2) longer durations, and (3) more damaging spectral shapes. - Inside basin motions result in lower collapse capacities than motions recorded outside the basin. - Basin design strength amplification accounts for the effect of basins and reduces the risk to structural collapse. Basin Amplification as predicted by Campbell and Bozorgnia 2014 (GMPE) 30 Concrete Moment Frame Archetypes 3 9 20 Various Building Heights Designed for Seattle by Hsiao 2012 , inplemented by others Steel Concentrically Braced Frames 2D Archetypes 3D Archetypes Concrete Shear Walls Evaluate Basin & Duration Effects on Structural Response Seattle Basin Tacoma Basin Everett Basin Mean GMPE Residual Contact Information: Nasser Marafi, University of Washington, [email protected] Increasing Z 2.5 Similar Amplifications to the Puget Lowland basin during Nisqually

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Page 1: Design Strength Factors that Account for Basin E ects

University of Washington / Nasser Marafi, Jeffrey Berman, Marc Eberhard, Erin Wirth United States Geological Survey / Arthur Frankel

INTRODUCTION

CONCLUSIONS

Design Strength Factors that Account for Basin Effects during Subduction Zone Earthquakes

EFFECTS ON DURATION

- Subduction earthquake recordings are from four deep basins in Japan.- Recordings are extracted from the K-NET and KiK-Net database.

COLLAPSE FRAGILITIES

This research was funded by the National Science Foundation under award number EAR-1331412. The computations were facilitated through the use of advanced computational, storage, and networking infrastructure provided by the Hyak supercomputing system at the University of Washington.

Generate Broadband Motions

Physics-based Simulations using High-Performance Computers

Seismic Wave Velocity Model

Puget Lowland Basin

TualatinBasin

NIGATTA BASIN

YUFUTSU BASIN

KONSEN BASIN

KANTO BASIN

BASIN EFFECTS ON SPECTRAL ACCELERATION- Basin amplification factors are computed using the ratio of GMPE residuals of inside-to-outside basin recordings. - Residuals are computed using the 2016 BC-Hydro Subduction GMPE.

PUGET LOWLAND BASINS- Deep sedimentary basins tend to increase the intensity of earthquake ground motions. - Basin amplifications on spectral acceleration are not directly included in the seismic hazard maps used in U.S. building codes. - The Pacific Northwest has several deep basins (Seattle, Tacoma, and Tualatin basin) and the potential for large- magnitude subduction earthquakes.

- Simulating M9 earthquakes from the Cascadia Subduction Zone.- Comparing physics-based ground-motion simulations with earthquake recordings from similar tectonic environments and basins with similar properties.

PeriodDependent

Max. Amplifications≈3 @ 7s

Stiff-soil and rock

stations

MagnitudeIndependent

EFFECTS ON SPECTRAL SHAPE

More DamagingSpectral Shapes

Longer Inside Basin Motions

DESIGN FACTORS

Reduction inCollapse Capacity

Accounts for theEffect of Duration

and Spectral Shape

Accounts for the Effect of Basin Amplification

on Spectral Acceleration

Kanto’s Max. Amplifications are at Shorter

Periods

ONGOING RESEARCH

LargeVariability

P-Delta Column

Lumped Plasticity

8-Stories, Tn=1.8s

Archetype by Haselton et al. 2011

- Ground motions recorded inside basins have (1) larger spectral accelerations, (2) longer durations, and (3) more damaging spectral shapes.- Inside basin motions result in lower collapse capacities than motions recorded outside the basin.- Basin design strength amplification accounts for the effect of basins and reduces the risk to structural collapse.

Basin Amplification as predicted by Campbell

and Bozorgnia 2014 (GMPE)

30 Concrete MomentFrame Archetypes

20Various Building Heights

Designed for Seattle

by Hsiao 2012 , inplemented by others

Steel Concentrically Braced Frames

2D Archetypes 3D Archetypes

Concrete Shear Walls

Evaluate Basin & DurationEffects on Structural Response

SeattleBasin

TacomaBasin