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WS S GS Design Maps Detailed Report <br /> 2012/2015 International Building Code (47.956420N, 122.2366°W) <br /> Site Class D-"Stiff Soil", Risk Category I/II/III <br /> Section 1613.3.1 — Mapped acceleration parameters <br /> Note: Ground motion values provided below are for the direction of maximum horizontal <br /> spectral response acceleration.They have been converted from corresponding geometric <br /> mean ground motions computed by the USGS by applying factors of 1.1 (to obtain SS)and <br /> 1.3 (to obtain S,). Maps in the 2012/2015 International Building Code are provided for Site <br /> Class B. Adjustments for other Site Classes are made, as needed, in Section 1613.3.3. <br /> From Figure 1613.3.1(1)1'1 Ss = 1.402 g <br /> From Figure 1613.3.1(2)Ill S, = 0.532 g <br /> Section 1613.3.2 — Site class definitions <br /> The authority having jurisdiction (not the USGS), site-specific geotechnical data, and/or the <br /> default has classified the site as Site Class D, based on the site soil properties in accordance <br /> with Section 1613. <br /> 2010 ASCE-7 Standard -Table 20.3-1 <br /> SITE CLASS DEFINITIONS <br /> Site Class VS N or R, S. <br /> A. Hard Rock >5,000 ft/s N/A N/A <br /> B. Rock 2,500 to 5,000 ft/s N/A N/A <br /> C. Very dense soil and soft rock 1,200 to 2,500 ft/s >50 >2,000 psf <br /> D. Stiff Soil 600 to 1,200 ft/s 15 to 50 1,000 to 2,000 psf <br /> E. Soft clay soil <600 ft/s <15 <1,000 psf <br /> Any profile with more than 10 ft of soil having the <br /> characteristics: <br /> • Plasticity index PI > 20, <br /> • Moisture content w >_ 40%, and <br /> • Undrained shear strength s„ < 500 psf <br /> F. Soils requiring site response See Section 20.3.1 <br /> analysis in accordance with Section <br /> 21.1 <br /> For SI: 1ft/s = 0.3048 m/s 1lb/ft2 = 0.0479 kN/mz <br />