Nasser Marafi, PE

marafi [at] uw [dot] edu
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Research Hazard-Sees M9

Résumé More About Me

Publications Papers I published


Research Tools

M9 CSZ Ground-Motions Simulated M9 Cascadia Subduction Zone Ground Motions

OpenSees API Interfacing with OpenSees through Python

Revit Tools Exporting Revit to ETABS

Research

My research involves studying the impact of a Magnitude 9 Cascadia Subduction Zone earthquake on the Pacific Northwest. I am working with a team of researchers that are simulating ground motions using physics-based 3D models of a large section of the Pacific Northwest. These models use seismic wave velocities to describe the geological structure of the Cascadia subduction zone and surrounding region, including several deep sedimentary basins. The generated motions, which are produced across the extensive model region represent multiple rupture realizations of possible M9 Cascadia subduction zone events. These motions tend to have long durations, and locations on deep basins tend to see amplification of the long period spectral accelerations.

Ground Velocity of Simulated M9 CSZ Earthquake

We are currently using a suite of well-studied nonlinear multi-degree-of-freedom archetypical building models and also developing archetypical models that represent commonly built structures in the Pacific Northwest. These nonlinear numerical models will be of structures that range in period, geometry, and cyclic force-deformation properties. The results from the many ground motion simulations will generate large suites of ground motions that will be used to estimate engineering demand on these archetypes in a probabilistic framework.

Response of a 20-story concrete moment frame to a M9 CSZ ground-motion

Response of a 40-story buckling restraint braced (BRB) structure to a M9 CSZ ground-motion

The goal of this research is to assess the adequacy of current building code designs to provide adequate performance and propose necessary modifications to design practice to account for ground motion duration and basin amplifications. Finally, various archetype structures designed in the Pacific Northwest are assessed probabilistically against collapse under a Magnitude 9 Subduction Zone earthquake.

Résumé

Education

August 2018 University of Washington, Seattle, WA
PhD Candidate in Civil Engineering
Emphases in Structures and Earthquake Engineering
Research Assistant - Hazard SEES - M9 Cascadia Subduction Zone
Dissertation: Impacts of an M9 Cascadia Subduction Zone Earthquake on Structures Located in Deep Sedimentary Basinsd
August 2008 The Pennsylvania State University, University Park, PA
Master of Architectural Engineering
Emphasis in Structures
August 2008 The Pennsylvania State University, University Park, PA
Bachelor of Architectural Engineering
Emphasis in Structures
Minor in Architectural Studies
"Sede di Roma" Study Abroad Program in Rome - Summer 2006

Professional Qualifications and Experience

July 2010 - Current Licensed Professional Engineer in the State of California
License Number: C77076
July 2010 - September 2013 KEO International Consultants, Free Trade Zone, Kuwait
September 2008 - July 2010 Buro Happold Consulting Engineers, New York, NY
May 2007 - August 2007 KPFF Consulting Engineers, New York, NY

Awards

2018 Charles H. Norris Award
2018 EERI Graduate Student Paper Award
2016-2017 EERI/FEMA NEHRP Graduate Fellow

Publications

Academic Journals

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10 Li, T., Marafi, N. A., Sen, A. D., Berman, J. W., Eberhard, M. O., Lehman, D. E., and Roeder C. W. (2018) Seismic Performance of Special Concentrically Braced Frames in Deep Basin during Subduction Zone Earthquakes. Engineering Structures, submitted
9 Marafi, N. A., Makdisi, A. J., Eberhard, M. O., and Berman, J. W. (2018) Impacts of M9 Cascadia Subduction Zone Earthquake and Seattle Basin on Performance of RC Core-Wall Buildings. Journal of Structural Engineering, submitted
8 Wirth, E. A., Vidale, J. E., Frankel, A. D., Pratt T. L., Marafi, N. A., Thompson M., and Stephenson W. J. (2018) Source-Dependent Amplification of Earthquake Ground Motions in Deep Sedimentary Basins. Geophysical Research Letters, submitted for USGS review
7 Marafi, N. A., Eberhard, M. O., Berman, J. W., Wirth E. A., and Frankel A. D. (2018) Impacts of Simulated M9 Cascadia Subduction Zone Earthquakes on Idealized Systems. Earthquake Spectra, submitted
6 Marafi, N. A., Ahmed, K. A., Lowes, L. N., and Lehman, D. E. (2018) Sensitivity of Collapse Analysis for Reinforced Concrete Walls to Modelling Parameters. Journal of Structural Engineering, accepted
5 Frankel, A., Wirth, E., Marafi, N. A., Vidale, J., and Stephenson, W. (2017) Broadband Synthetic Seismograms for Magnitude 9 Earthquakes on the Cascadia Megathrust Based on 3D Simulations and Stochastic Synthetics: Methodology and Overall Results. Bulletin of the Seismological Society of America, doi: 10.1785/0120180034.
4 Wirth, E., Frankel, A., Marafi, N. A., Vidale, J., and Stephenson, W. (2017) Broadband Synthetic Seismograms for Magnitude 9 Earthquakes on the Cascadia Megathrust Based on 3D Simulations and Stochastic Synthetics: Rupture Parameters and Uncertainty. Bulletin of the Seismological Society of America, doi: 10.1785/0120180029.
3 Xinsheng, Q., Motley, M. R., and Marafi, N. A. (2018) Three-Dimensional Modeling of Tsunami Forces on Coastal Communities, Coastal Engineering, doi: 10.1016/j.coastaleng.2018.06.008.
2 Marafi, N. A., Eberhard, M. O., Berman, J. W., Wirth E. A., and Frankel A. D. (2017) Effects of Deep Basins on Structural Collapse during Large Subduction Earthquakes. Earthquake Spectra. doi: 10.1193/071916EQS114M.
1 Marafi, N. A., Berman, J. W., and Eberhard, M. O. (2016) Ductility-dependent intensity measure that accounts for ground-motion spectral shape and duration. Earthquake Engng Struct. Dyn., doi: 10.1002/eqe.2678.

Conference Proceedings

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9 Marafi, N. A., Eberhard, M. O., Berman, J. W., Wirth, E. A., Frankel, A., and Vidale, J. (2018) Effects of Simulated Magnitude 9 Earthquake Motions on Structures in the Pacific Northwest. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted.
8 Molina-Hutt, C., Marafi, N. A., Eberhard, M. O., and Berman, J. W. (2018) Impact of Basin Effects during Subduction Zones in the Collapse Fragility of Existing Tall Buildings. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted
7 Marafi, N. A., Ahmed, K., Lehman, D., and Lowes, L. (2018) Collapse Analysis of RC Walls with Openings and Sensitivity of Model Parameter Uncertainties. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted.
6 Marafi, N. A., Li, T., Sen, A., Berman, J. W., Eberhard, M. O., Lehman, D., and Roeder C. (2018) Accounting for Demand Variability of Steel Braced Frames with a Combined Intensity Measure. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted.
5 Sen, A., Cakir, R., and Marafi, N. A. (2018) Seismic Risk Assessment and Educational Outreach for Schools in Central Washington. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted
4 Wirth, E., Frankel, A., Vidale, J., Stephenson, W., and Marafi, N. A. (2018) 3-D Simulations of M9 Earthquakes on the Cascadia Megathrust: Sensitivity and Uncertainty. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted
3 Frankel, A., Wirth, E., Vidale, J., Stephenson, W., and Marafi, N. A. (2018) 3-D Simulations of M9 Earthquakes on the Cascadia Megathrust: Methodology and Results. 11th National Conference on Earthquake Engineering, Los Angeles, CA. paper accepted
2 Marafi, N. A., Eberhard, M. O., and Berman, J. W. (2017) Effects of the Yufutsu Basin on Structural Response during Subduction Earthquakes. paper accepted.
1 Marafi, N. A., Berman, J. W., and Eberhard, M. O. (2017) A New Intensity Measure that Accounts for the effects of Spectral Acceleration, Duration, and Spectral Shape. 16th World Conference in Earthquake Engineering. paper accepted.