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USGS96SA

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"USGS96SA" --- USGS 1996 SPECTRAL ACCELERATION VALUES Program Description: "USGS96SA" is a spreadsheet program written in MS-Excel for the purpose of determining the m spectral acceleration values Ss and S1 to be used for seismic analysis and design in either or IBC 2003 Codes. Results may be obtained by input of location Zip Code or input of precis location latitude and longitude angles and are based on the 1996 USGS gridded data. This program is a workbook consisting of two (2) worksheets, described as follows: Worksheet Name Description Doc This documentation sheet USGS 1996 SA Values USGS 1996 spectral acceleration, Ss and S1 values Program Assumptions and Limitations: 1. References are: a. "Seismic Design Parameters for Use with the 2000 International Buildi 2000 International Residential Code, 1997 NEHRP Seismic Design Provi and 1997 NEHRP Rehabilitation Guidelines" CD - Version 3.01 by: E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales Prepared by the U.S. Geological Survey (USGS) - February 2000 Text file used for Lat. and Long. vs. Ss and S1 values only was: "MC b. Interim User Guide for Seismic Design Parameters" - Version 4.00 with "2003 NEHRP Recommended Provisions and FEMA 450" CD - June 2003 by: E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales Prepared by the U.S. Geological Survey (USGS) - June 2004 Text file used for zip codes only was: "2003-Zip-Codes.txt" c. USGS Seismic Hazards internet web site located at: 2. The Zip Code file listing from Reference "b" above was used instead of the Zip Code file because it was more recent and contained many more entries. 3. The original Zip Code file listing used from Reference "b" above was modified to include between 24.6 (rounded) and 50 degrees, as well as only longitude angles between -125 an 4. The USGS 1996 gridded values for mapped spectral accelerations, Ss and S1, from Referenc the values used in creating the maps that appear both in the IBC 2000 and IBC 2003 Code Ss and S1 based on the Zip Code are for the latitude and longitude at the centroid of t Since these spectral acceleration values may vary widely within a particular Zip Code, get the precise latitude and longitude of the project location for the most accurate re (Note: while the USGS does have later, 2002 gridded design values for Ss and S1 availab the user is cautioned in their use in that they are technically and legally not adopted 2000 or IBC 2003 Codes. If their use would result in a lower Seismic Design Category a loads, the user is advised to seek official approval of their use by the owner and buil http://eqhazmaps.usgs.gov/
Transcript
Page 1: USGS96SA

"USGS96SA" --- USGS 1996 SPECTRAL ACCELERATION VALUES

Program Description:

"USGS96SA" is a spreadsheet program written in MS-Excel for the purpose of determining the mapped spectral acceleration values Ss and S1 to be used for seismic analysis and design in either the IBC 2000 or IBC 2003 Codes. Results may be obtained by input of location Zip Code or input of precise known location latitude and longitude angles and are based on the 1996 USGS gridded data.

This program is a workbook consisting of two (2) worksheets, described as follows:

Worksheet Name DescriptionDoc This documentation sheet

USGS 1996 SA Values USGS 1996 spectral acceleration, Ss and S1 values

Program Assumptions and Limitations:

1. References are: a. "Seismic Design Parameters for Use with the 2000 International Building Code, 2000 International Residential Code, 1997 NEHRP Seismic Design Provisons, and 1997 NEHRP Rehabilitation Guidelines" CD - Version 3.01 by: E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales Prepared by the U.S. Geological Survey (USGS) - February 2000 Text file used for Lat. and Long. vs. Ss and S1 values only was: "MCE_10-48states.out"b. Interim User Guide for Seismic Design Parameters" - Version 4.00 with "2003 NEHRP Recommended Provisions and FEMA 450" CD - June 2003 by: E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales Prepared by the U.S. Geological Survey (USGS) - June 2004 Text file used for zip codes only was: "2003-Zip-Codes.txt"c. USGS Seismic Hazards internet web site located at:

2. The Zip Code file listing from Reference "b" above was used instead of the Zip Code file from Reference "a" because it was more recent and contained many more entries.3. The original Zip Code file listing used from Reference "b" above was modified to include only latitude angles between 24.6 (rounded) and 50 degrees, as well as only longitude angles between -125 and -65 degrees.4. The USGS 1996 gridded values for mapped spectral accelerations, Ss and S1, from Reference "a" above are the values used in creating the maps that appear both in the IBC 2000 and IBC 2003 Codes. The values for Ss and S1 based on the Zip Code are for the latitude and longitude at the centroid of the Zip Code area. Since these spectral acceleration values may vary widely within a particular Zip Code, the user is advised to get the precise latitude and longitude of the project location for the most accurate results. (Note: while the USGS does have later, 2002 gridded design values for Ss and S1 available at their web site, the user is cautioned in their use in that they are technically and legally not adopted for use by either the IBC 2000 or IBC 2003 Codes. If their use would result in a lower Seismic Design Category and reduced seismic loads, the user is advised to seek official approval of their use by the owner and building official if applicable.)

http://eqhazmaps.usgs.gov/

Page 2: USGS96SA

"SEISMIC.xls" ProgramVersion 1.0

2 of 2 04/07/2023 14:01:22

SEISMIC DESIGN SPECTRAL ACCELERATION VALUESper 1996 U.S. Geological Survey (USGS) Gridded Data

Job Name: Subject:Job Number: Originator: Checker:

Input:

29607 if results based on Zip Code are not desired.)

Results:

Latitude and Longitude for Zip Code:Precise Latitude = 34.8254 deg.

Precise Longitude = -82.3481 deg.Latitude (used) = 34.8 deg.

Longitude (used) = -82.3 deg.

Design Spectral Acceleration Values: for 2% Probability of Exceedance in 50 years (USGS 1996)40.7133 %g Ss = 0.2 sec. (short) period mapped spectral acceleration13.9485 %g S1 = 1.0 sec. period mapped spectral acceleration

Input:

Precise Latitude and Longitude:Precise Latitude = deg.

Precise Longitude = deg. if results based on Lat. and Long. are not desired.)

Results:

Latitude and Longitude Used:Latitude (used) = N.A. deg.

Longitude (used) = N.A. deg.

Design Spectral Acceleration Values:N.A. %gN.A. %g

References: a. "Seismic Design Parameters for Use with the 2000 International Building Code, 2000 International Residential Code, 1997 NEHRP Seismic Design Provisons, and 1997 NEHRP Rehabilitation Guidelines" CD - Version 3.01 by: E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales Prepared by the U.S. Geological Survey (USGS) - February 2000

b. Interim User Guide for Seismic Design Parameters" - Version 4.00 with "2003 NEHRP Recommended Provisions and FEMA 450" CD - June 2003 by: E.V. Leyendecker, A.D. Frankel, and K.S. Rukstales Prepared by the U.S. Geological Survey (USGS) - June 2004 Text file used for zip codes only was: "2003-Zip-Codes.txt"c. USGS Seismic Hazards internet web site located at:

(5-Digit) Zip Code = (Note: "Clear Contents" or input either 0 or N.A. for Zip Code

Ss =S1 =

(Note: "Clear Contents" or input either 0 or N.A. for Lat. and Long.

Ss =S1 =

Text file used for Lat. and Long. vs. Ss and S1 values only was: "MCE_10-48states.out"

http://eqhazmaps.usgs.gov/

C14
Precise latitude for centroid of given zip code comes from text file, "2003-ZipCodes.txt" from USGS 2004 CD, Reference #2.
C15
Precise longitude for centroid of given zip code comes from text file, "2003-ZipCodes.txt" from USGS 2004 CD, Reference #2.
C16
Resulting precise latitude is rounded to one (1) significant digit for use in table of data for seismic design spectral acceleration values, Ss and S1.
C17
Resulting precise longitude is rounded to one (1) significant digit for use in table of data for seismic design spectral acceleration values, Ss and S1.
C20
Short term, 0.2 sec. period mapped Spectral Acceleration with 2% Probability of Exceedance in 50 years, "Ss", comes from text file, "MCE_10-48states.out" (dated 3/18/1999), located in "MCE97ASCIIDATA" folder of USGS reference CD.
C21
One second period mapped Spectral Acceleration with 2% Probability of Exceedance in 50 years, "S1", comes from text file, "MCE_10-48states.out" (dated 3/18/1999), located in "MCE97ASCIIDATA" folder of USGS reference CD.
C27
If results are desired, the precise latitude input must be >= 24.55 deg. and <= 50 deg.
C28
If results are desired, the precise longitude input must be >= -125 deg. and <= -65 deg.
C33
Precise latitude input is rounded to one (1) significant digit for use in table of data for seismic design spectral acceleration values, Ss and S1.
C34
Precise longitude input is rounded to one (1) significant digit for use in table of data for seismic design spectral acceleration values, Ss and S1.
C37
Short term, 0.2 sec. period mapped Spectral Acceleration with 2% Probability of Exceedance in 50 years, "Ss", comes from text file, "MCE_10-48states.out" (dated 3/18/1999), located in "MCE97ASCIIDATA" folder of USGS reference CD.
C38
One second period mapped Spectral Acceleration with 2% Probability of Exceedance in 50 years, "S1", comes from text file, "MCE_10-48states.out" (dated 3/18/1999), located in "MCE97ASCIIDATA" folder of USGS reference CD.

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