PEER NGA
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Seismic Loads: Guide to the Seismic Load Provisions ASCE 7-05 217 Appendix C Using the PEER NGA Database This document explains how to use the PEER Ground Motion database. In most cases, this data- base is used to download ground motion record sets to be used in response history analysis of structures. To access the database, go to the main page for the site, http://peer.berkeley.edu/nga/ To get ground motion records, click on Search (in the middle of the second line of text from top). To find a specific earthquake, scroll down in the box to the right of “Earthquake.” For example, to find the Loma Prieta earthquake, scroll down to “Loma Prieta 1989-10-18 00:05” and select it. To see where the records are located, click the Search button at the bottom of the form. The results will appear in a map. After zooming in on the map, you will see the map shown in Fig. GC–1. If you click on “Monterey,” for example, you will see the map shown in Fig. GC–2. Alternatively, rather than use the map, you may obtain a list all of the ground motion records related to the earthquake. To do this, change “Display Results” from “on Map” to “in Table” and click Search. You will see a long list of record sets, only part of which is shown below: Record Earthquake Station NGA0731 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58373 APEEL 10 - Skyline NGA0732 Loma Prieta 1989-10-18 00:05 (6.93) USGS 1002 APEEL 2 - Redwood City NGA0733 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58393 APEEL 2E Hayward Muir NGA0734 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58219 APEEL 3E Hayward CSUH NGA0735 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58378 APEEL 7 - Pulgas NGA0736 Loma Prieta 1989-10-18 00:05 (6.93) USGS 1161 APEEL 9 - Crystal Springs Res NGA0737 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 57066 Agnews State Hospital Seismic Loads Downloaded from ascelibrary.org by 202.0.107.126 on 06/27/14. Copyright ASCE. For personal use only; all rights reserved.
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Seismic Loads: Guide to the Seismic Load Provisions ASCE 7-05 217Appendix CUsing the PEER NGA DatabaseThisdocumentexplainshowtousethePEERGroundMotiondatabase.Inmostcases,thisdata-base is used to download ground motion record setsto be used in response history analysis of structures.To access the database, go to the main page for the site, http://peer.berkeley.edu/nga/Togetground motion records,clickonSearch(inthemiddle ofthesecond line of text from top).Tofindaspecificearthquake,scrolldownintheboxtotherightofEarthquake.Forexample,tofindtheLomaPrietaearthquake,scrolldown to Loma Prieta 1989-10-18 00:05 and select it.Toseewheretherecordsarelocated,clicktheSearchbuttonatthebottom of the form. The results will appear in a map. After zooming in onthe map, you will see the map shown in Fig. GC1.If you click on Monterey, for example, you will see the map shown inFig. GC2.Alternatively,ratherthanusethemap,youmayobtainalistalloftheground motion records related to the earthquake. To do this, change DisplayResults from on Map to in Table and click Search. You will see a long listof record sets, only part of which is shown below:RecordEarthquake StationNGA0731 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58373 APEEL 10 - SkylineNGA0732 Loma Prieta 1989-10-18 00:05 (6.93) USGS 1002 APEEL 2 - Redwood CityNGA0733 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58393 APEEL 2E Hayward Muir NGA0734 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58219 APEEL 3E Hayward CSUHNGA0735 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 58378 APEEL 7 - PulgasNGA0736 Loma Prieta 1989-10-18 00:05 (6.93) USGS 1161 APEEL 9 - Crystal Springs ResNGA0737 Loma Prieta 1989-10-18 00:05 (6.93) CDMG 57066 Agnews State Hospital Seismic Loads Downloaded from ascelibrary.org by 202.0.107.126 on 06/27/14. Copyright ASCE. For personal use only; all rights reserved.218 Seismic Loads: Guide to the Seismic Load Provisions of ASCE 7-05Figure GC1 Map for LomaPrieta Earthquake.Figure GC2 Selecting the Monterey City Hall Record. Seismic Loads Downloaded from ascelibrary.org by 202.0.107.126 on 06/27/14. Copyright ASCE. For personal use only; all rights reserved.Seismic Loads: Guide to the Seismic Load Provisions ASCE 7-05 219Returntothemap-basedsearchdisplay.UsingtheexamplesearchforMonterey,clickonGroundMotionRecordsinthebubblecaption,andthe screen shown in Fig. GC3 appears.This diagram gives information about the earthquake, as well as linkstogettheactualgroundmotionaccelerationrecords.Thereareusuallythree records per set: northsouth (in this case 000), eastwest (090), andvertical (UP) records.Toseethenorthsouthgroundmotionrecord,clickontherecordname, for example, LOMAP/MCH000 (displayed in the map-based searchresults). This is the northsouth component because the compass bearing isgiven as 000 in the title. Compass bearings are shown in Fig. GC4.The following data will then appear (there are many more lines of datathan shown below):PEER NGA STRONG MOTION DATABASE RECORDLOMA PRIETA 10/18/89 00:05, MONTEREY CITY HALL, 000 (CDMG STATION 47377)ACCELERATION TIME HISTORY IN UNITS OF G79900.0050NPTS, DT-0.129203E-02-0.155257E-02-0.117803E-02-0.355531E-03-0.482559E-03-0.484030E-03-0.481456E-03-0.477630E-03-0.476219E-03-0.479441E-03-0.487404E-03-0.499153E-03-0.513798E-03-0.531229E-03-0.551795E-03-0.574890E-03-0.598821E-03-0.621665E-03-0.641146E-03-0.654379E-03-0.658443E-03-0.651863E-03-0.635102E-03-0.610199E-03-0.580759E-03-0.552201E-03-0.529093E-03-0.511311E-03-0.493790E-03-0.469597E-03-0.434634E-03-0.388477E-03-0.334624E-03-0.280486E-03-0.230926E-03-0.187375E-03-0.152341E-03-0.129905E-03-0.122443E-03-0.129574E-03-0.150408E-03-0.182927E-03-0.222825E-03-0.261722E-03-0.288505E-03-0.298566E-03-0.297028E-03-0.290274E-03-0.284506E-03-0.281662E-03-0.276887E-03-0.266221E-03-0.251237E-03-0.242671E-03-0.249410E-03-0.272418E-03-0.313515E-03-0.368816E-03-0.425876E-03-0.474587E-03The ground motion data is written in rows. In this file, there are 7,990 datapoints, written at a time increment of 0.005 s. The accelerations are writtenin g units.To save the data to your computer, Select All of the data, copy, andthen paste into a NOTEPAD file.Tousethedatainanalysissoftware,youmayneedtocopythefourlines of header information that accompanies each record.Other information: The PEER NGA database also contains a huge Excelspreadsheetcalledtheflatfile,whichcontainsahostofinformationabouteach ground motion. This spreadsheet can be downloaded from the Down-load link at the top of the file, and the explanation of the data in the spread-sheet can be obtained from the Documentation link. This information willbeusefulwhen you are tryingtoselectseveral earthquakes that have similarcharacteristics, such as fault type, magnitude, site characteristics, and so on. Seismic Loads Downloaded from ascelibrary.org by 202.0.107.126 on 06/27/14. Copyright ASCE. For personal use only; all rights reserved.220 Seismic Loads: Guide to the Seismic Load Provisions of ASCE 7-05Figure GC3 Detailed Information on Single Ground Motion.Figure GC4 Compass for Ground Motion Bearings. Seismic Loads Downloaded from ascelibrary.org by 202.0.107.126 on 06/27/14. Copyright ASCE. For personal use only; all rights reserved.
