Bldg 1365 - AppC Struct Calcs.pdf

SHEET NO. OF

JOB NO.

PROJECT Bldg 1365 Seismic Assessment, Travis AFB, CA MADE BY CWM DATE 12/13/05 SUBJECT PGA for PML Calculation CHKD.BY DATE

Extrapolate from three given PGA to find a fourth

For Probability of Exceedance Average return time =

2 % in 50 Years, PGA = 0.91 g 2475 Years

5 % in 50 Years, PGA = 0.66 g 975 Years

10 % in 50 Years, PGA = 0.48 g 475 Years

For Probability of Exceedance, find extrapolated PGA: Average return time =

50 % in 50 Years, PGA = 0.06 g 73 Years

If PGA = #NUM!, it probably means that the circle through the three points does not pass through the target average return time, generally likely to be less than zero.

Extrapolates a circle drawn through three known points on a curve of log (average return period) vs PGA.

P501 05 0095

PROJECT Bldg 1365 Seismic Assessment, Travis AFB, CA MADE BY CWM DATE 12/13/05 SUBJECT Effective PGA (EPGA) extrapolated CHKD.BY DATE

For Probability of Exceedance Average return time =

2 % in 50 Years, PGA = 1.92 g 2475 Years

5 % in 50 Years, PGA = 1.43 g 975 Years

10 % in 50 Years, PGA = 1.12 g 475 Years

For Probability of Exceedance, find extrapolated PGA: Average return time =

50 % in 50 Years, PGA = 0.50 g 73 Years

If PGA = #NUM!, it probably means that the circle through the three points does not pass through the target average return time, generally likely to be less than zero.

Extrapolates a circle drawn through three known points on a curve of log (average return period) vs EPGA.

P501 05 0095

Extrapolate from three given PGA to find a fourth. This calculation uses the 0.2 sec spectral acceleration to find the "effective PGA."

PROJECT Travis AFB - Bldg 1365 MADE BY CWM DATE 12/13/05 SUBJECT Thiel-Zsutty PML (concrete magazine) CHKD.BY DATE d = k*bms*a^j-0.013 k = 0.573 (a constant)

Min Max b = 0.51 0.51 m = 0.5 0.5 s = 1.95 1.95 a = 0.06 0.06 MPE: 50% in 50 years (73-year return)

0.48 0.48 DBE: 10% in 50 years (475-year return)

0.91 0.91 MCE: 2% in 50 years (2475-year return) j = 0.630 (a constant)

Min Max d = 4 4 MPE: 50% in 50 years (73-year return)

17 17 DBE: 10% in 50 years (475-year return)

26 26 MCE: 2% in 50 years (2475-year return)

(site soil parameter, from Table 7-1, with identification from data on 1962 drawings) ("Quaternary alluv., water table<30 ft" chosen)

P501010031 d is given as PML. Actually, "d" is a "portfolio" damage estimate, not a single building estimate.

(similarity of bldg and site periods, from Table 8-4) ("substantially different" chosen)

( vulnerability parameter, from Table 8-3 or as modified) ("walls of CIP concrete, roof other than reinforced concrete" chosen)

PROJECT Travis AFB - Bldg 1365 MADE BY CWM DATE 12/13/05 SUBJECT Thiel-Zsutty PML (steel shed over magazine) CHKD.BY DATE d = k*bms*a^j-0.013 k = 0.573 (a constant)

Min Max b = 0.11 0.11 m = 0.5 0.5 s = 1.95 1.95 a = 0.06 0.06 MPE: 50% in 50 years (73-year return)

0.48 0.48 DBE: 10% in 50 years (475-year return)

0.91 0.91 MCE: 2% in 50 years (2475-year return) j = 0.630 (a constant)

Min Max d = 0 0 MPE: 50% in 50 years (73-year return)

3 3 DBE: 10% in 50 years (475-year return)

4 4 MCE: 2% in 50 years (2475-year return)

(site soil parameter, from Table 7-1, with identification from data on 1962 drawings) ("Quaternary alluv., water table<30 ft" chosen)

P501010031 d is given as PML. Actually, "d" is a "portfolio" damage estimate, not a single building estimate.

(similarity of bldg and site periods, from Table 8-4) ("substantially different" chosen)

( vulnerability parameter, from Table 8-3 or as modified) ("light metal" chosen)