39 Seismic ASCE 7-02-05

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SEISMIC CALCULATIONS ASCE/SEI 7-02 and 7-05

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SEISMIC ASCE/SEI 7-02 and 7-05

Figure 39-1 This is the map for the 1.0 second spectral response acceleration.

Figure 39-2 This is the map for the 0.2 second spectral response acceleration.

Note: USGS maps are 5% of Critical Damping, Site Class B. Near source factors Na and Nv are accounted for in the seismic maps and lookup tables ASCE 7-02 and 7-05 callouts are presented as 7-02 / 7-05 for ease of cross-referencing Site Class D Stiff soil SUG IE

D

Site Classification Tables 1-1, 9.13 and 9.14 / Tables 1-1 and 11.5-1 600 < vs < 1,200 15 < N < 50 1,000 < su < 2,000 III Seismic Use Group Table 9.1.4 / Table 1-1 1.25 unitless occupancy importance factor

SS

0.9692 g ultimate

Fa

1.1123 unitless Velocity Based Site Coefficient for short periods Table 9.4.1.2.4a / Table 11.4-1 1.0781 g ultimate 1.1123 * 0.9692 Fa SS Eq. 9.4.1.2.4-1 / Eq. 11.4-1 2/3 SMS design response accelleration at short periods Eq. 9.4.1.2.5-1 / 0.7187 g ultimate 2/3 1.0781 Eq. 11.4-1

SMS SDS

S1 Fv SM1 SD1

row 40

mapped maximum spectral response acceleration at short periods for Site Class B

0.3584 g ultimate mapped maximum response accelleration at T = 1.0 sec Table 9.4.1.2.4b / Table 11.4-2 row 50 1.6832 unitless Velocity Based Site Coefficient at T = 1.0 sec Table 9.4.1.2.4b / Table 11.4-2 0.6033 g ultimate 1.6832 * 0.3584 Fa S1 Eq. 9.4.1.2.4-1 / Eq. 11.4-2 2/3 SM1 design response accelleration at short periods Eq. 9.4.1.2.5-2 / 0.4022 g ultimate 2/3 0.6033 Eq. 11.4-2

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SEISMIC CALCULATIONS ASCE/SEI 7-02 and 7-05

39

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EQUIVALENT LATERAL FORCE PROCEDURE 9.5.5 ASCE 7-02 and 7-05 callouts are presented as 7-02 / 7-05 for ease of cross-referencing R Ωo Cd

3 unitless response modification coefficient Tables 9.5.2.2 and 9.14.5.1.1 / Table 12.1-1 3 unitless system over-strength factor 2.5 unitless deflection amplification factor 4 lookup 0 logic

Site Classification Table 9.4.1.2 / ????? (4 > 5) lookup selection for Site Class Categories A, B, C, D Eqs. 9.5.5.2.1 - 2 & 3 Site Class A has been removed from ASCE 7-05

SD1_

0.4022 g ultimate

IF(0, 0.900 ASCE 9.4.1.3.4, 0.402 ASCE 9.4.1.2.4b )

SDS_

0.7187 g ultimate

IF(0, 0.090 ASCE 9.4.1.3.4, 0.719 ASCE 9.4.1.2.4a)

Cs 1

0.2995 g ultimate

SDS /(R_ /I) Seismic design coefficient (Eq 9.5.5.2-1)

row 70

0.719 /(3.0 /1.25) Cs 2 max

1.6757 g ultimate

SD1 /T /(R_ /I) (Eq. 9.5.5.2.1-2) 0.402 /0.100 /(3.00 /1.25)

row 80

Cs 3 min

0.0395 g ultimate

0.044 * SDS * I (Eq. 9.5.5.2.1-3) 0.044 * 0.719 * 1.25

Cs 4 min

0.0747 g ultimate

0.5 * S 1 /(R_ /I) (Eq 9.5.5.2.1-4) for design categories E and F 0.5 * 0.358 /(3.0 /1.25)

Site Class

Cs

4 lookup

Table 9.4.1.2 Site Classification

0.040

IF(4 < 6, 0.040, 0.075 Site Classes E & F)

0.299 g ultimate

MAX( MIN(0.299, 1.676), 0.040) seismic response coefficient, ultimate strength for V = Cs W Eq. 9.5.5.2-1 / Eq. 12.8-1 0.299 /1.4 seismic response coefficient, working stress

0.214 g ASD

Values from the '97 UBC are:

0.304 Ultimate 0.217 Allowable Stress Design

row 90

98.5 %

For errata to the ASCE 7-02, click on: 7-02 Errata 7-02 Symbols 7-02 Updated Snow Diagram 7-02 Updated Snow Diagram http://www.ice-or.com

row 100

For maps http://eqhazmaps.usgs.gov/html/wus2002.html http://neic.usgs.gov/neis/states/oregon/ row 110