How To Download Ground Motion From Peer

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J. Baker ane Ground motions for the PEER Transportation Systems Research Program Jack Baker Ceremonious & Ecology Engineering Stanford Academy

J. Bakery 2 Motivation • The goal of this projection is to select a standardized set of basis motions for the TSRP that – Tin exist used to clarify a variety of bridge and geotechnical systems – Are appropriate for a variety of locations in California (i. e. , mid- to big-magnitude shallow crustal earthquakes at well-nigh to moderate distances) • The systems of interest may be sensitive to excitation at a wide range of periods • Some sites of interest may take the potential to feel nigh-fault directivity pulses • Because these are not structure-specific and site-specific goals, ground movement selection techniques developed in previous PEER projects are not directly applicative hither

J. Baker three The product: several standardized ground motion sets http: //peer. berkeley. edu/transportation/gm_peer_transportation. html

J. Bakery four Data format and documentation • All ground motions are three-component • All basis motions come up from the PEER NGA database, and are indexed by "NGA number" for easy cross referencing with the NGA Flatfile • Additional information not in the current NGA Flatfile is included in supplemental spreadsheets – – Directivity pulse periods Scale factors (if applicable) Component response spectra of scaled motions ε values

J. Baker v Broadband ground motions • Selected to match the median and variability in response spectra associated with an M = 7, R = 10 km strike slip convulsion • Separate sets are provided for soil and rock conditions (Vs 30 = 250 m/s and 760 k/s) – – Recordings from appropriate sites Target spectra account for site conditions • A set is provided for lower-amplitude shaking (Grand = 6, R = 25 km Vs 30 = 250 m/s) • This required development of a new ground move pick algorithm: Jayaram, Due north. , Lin, T. , and Baker, J. W. (2010). "A computationally efficient ground-motion selection algorithm for matching a target response spectrum mean and variance. " Earthquake Spectra , (in press). Target spectrum:

J. Bakery vi Site-specific basis motions for Oakland I-880 Viaduct • Same location every bit the PEER I 880 testbed • Ground motions selected to closely match USGS Uniform Run a risk Spectra and Deaggregations

J. Bakery 7 Comparing of ground motions Broadband soil ground motions 50%/50 yrs site-specific ground motions

J. Baker 8 Comparing of footing motility spectra Broadband soil ground motions 50%/50 yrs site-specific ground motions

J. Baker 9 Comparison of ground motion spectra Broadband soil ground motions Site-specific ground motions

J. Baker 10 Comparison of other basis move backdrop Broadband soil basis motions Other backdrop – Variability included – No scaling – Velocity pulses non specifically included or excluded 50%/50 yrs site-specific ground motions Other properties – No variability desired in spectra or other properties – Scaled to match targets – Velocity pulses included in proportion to expected occurrence at the site of interest

J. Baker 11 Another ready of footing motions: near-fault motions with pulses • Forty ground motions with strong velocity pulses in the error-normal component are provided • Pulse periods vary • The ground motions are unscaled

J. Baker 12 Nigh-fault motions with pulses • These motions are all high intensity and recorded close to faults • They accept a variety of pulse periods, in recognition of the variety of structures that they might be used to clarify

J. Baker 13 Boosted data for the near-fault motions with pulses Original ground motion Extracted pulse Residual motion later on pulse extraction Time histories and response spectra for all 3 "parts" of the ground motions are available Baker, J. W. (2007). "Quantitative Nomenclature of Near-Fault Ground Motions Using Wavelet Analysis. " Message of the Seismological Social club of America , 97(5), 1486 -1501.

J. Baker fourteen Provided data: summary metadata from NGA Flatfile

J. Baker 15 Provided data: documentation of metadata

J. Baker xvi Provided information: response spectra Target spectra, and response spectra for each horizontal component of each footing move, geometric mean spectra, GMRot. I 50 spectra

J. Baker 17 Provided data: prediction residuals (ε's) Prediction residuals for spectra of each horizontal component of each ground move, geometric hateful spectra and GMRot. I l spectra

J. Baker 18 Provided data: draft summary reports Documentation of targets, pick methodology and summary data for each selected set (2 reports, 34 pages total). A comprehensive PEER Technical Written report is in grooming.

J. Baker nineteen A related resources: source code for CMS ground motion selection http: //www. stanford. edu/~bakerjw/gm_selection. html Jayaram, N. , Lin, T. , and Bakery, J. W. (2010). "A computationally efficient basis-motion selection algorithm for matching a target response spectrum mean and variance. " Earthquake Spectra, (in press).

J. Baker 20 In summary http: //peer. berkeley. edu/transportation/gm_peer_transportation. html 40 ground motions each Prepare 1: Broadband motions at soil site -M=7, R = x km -Thousand=6, R = 25 km Set 2: Broadband motions at rock site (1000=7, R = 10 km) Set 3: Pulse-like basis motions (varying pulse periods) Prepare 4: Site-specific footing motions for Oakland I-880 -l% in 50 years UHS target -10% in 50 years UHS target -2% in 50 years UHS target

How To Download Ground Motion From Peer,

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