Aecom Technical Services, Inc.

Project Title: Incorporating Rupture Directivity Effects Into Models for Significant Duration, Cumulativeabsolute Velocity, and Arias Intensityproject Period: 8 1 2023 Through 7 31 2024AWARD Purpose: This Study Will Address an Important Need by Updating Prediction Models for the Following Ground Motion Parameters: Significant Duration, Cumulative Absolute Velocity, and Arias Intensity. These Models Will Be Updated to Account for the Effects of Rupture Directivity, Which Can Have Significant Impacts on Ground Motions in the Near Fault Region (depending on the Style of Faulting and the Source-site-hypocenter Geometry). Currently, Models for Significant Duration, Cumulative Absolute Velocity, and Arias Intensity Do Not Account for Rupture Directivity Effects.these Three Ground Motion Parameters Have a Long History and Wide Range of Usage in Various Geotechnical and Structural Engineering Applications for Describing the Damage Potential of Earthquake Ground Motions. (e.g., Geotechnical: Seismic Displacement of Landslides, Generation of Excessive Pore Water Pressure for Potentially Liquefiable Soils, Peak Displacements of Pile Foundations, Slope Stability. Structural: Collapse Capacity of Structures, Seismic Performance of Bridges, Accumulated Damage of Concrete Gravity Dams, Nuclear Power Plant Shutdown Criterion.) by Accounting for Rupture Directivity Effects, We Will Improve Our Characterization of These Important Parameters in the Near Fault Region.activities to Be Performed: the Recipient Will Perform Residual Analyses Using the NGA-WEST2 Database (ancheta Et Al., 2013) and Using the Suite of Earthquake Simulations Collected in Bayless Et Al. (2020). Residuals Will Be Calculated From Published Models for Significant Duration, Cumulative Absolute Velocity, and Arias Intensity. These Residuals Will Be Evaluated With Respect to Rupture Directivity Parameters (e.g., Bayless Et Al., 2020 Somerville Et Al., 1997 Spudich Et Al., 2013) to Identify Rupture Directivity Effects That Are Not Captured in the Ground Motion Models. Based on This Analysis, the Recipient Will Develop Refinements to the Near-fault Predictions of the Published Models. Finally, We Will Systematically Test the Updated Models and Will Compare With Other Previously Published Models to Illustrate the Impact of Incorporating Rupture Directivity Effects on the Predictions. the Recipient Will Document the Process in a Technical Report and Will Publish in a Peer-reviewed Journal.deliverables and Expected Outcomes: the Products That This Project Will Generate Are:an Adjustment to the Afshari and Stewart (2016) Significant Duration Model (median and Standard Deviation) for Rupture Directivity Effects.an Adjustment to the Campbell and Bozorgnia (2019) Cumulative Absolute Velocity and Arias Intensity Models (median and Standard Deviation) for Rupture Directivity Effects.computer Codes for Implementation.publication of the Models in a Peer-reviewed Journal.intended Beneficiaries: These Products Will Be Beneficial to Many Hazard Analysts and Engineers, Including Those at the Usgs, and Will Improve Our Characterization of Near-source Significant Duration, Cumulative Absolute Velocity, and Arias Intensity.subrecipient Activities: None