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6t5t2014 Design Maps Detailgd Reporl <br />ZTEGS Design Maps Detailed Report <br />ASCE 7-10 Standard (33.7028"N, 117.8964oW) <br />Site Class D - "Stiff Soil", Risk Category I/IIlllI <br />Section tL.4.L - 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 51). Maps in the 2010 ASCE-7 Standard are provided for Site Class B. <br />Adjustments for other Site Classes are made, as needed, in Section 11.4.3. <br />From Egure 22-1 trl Ss = 1.532 I <br />From Egure 22-2 t2l Sr = 0.568 g <br />Section lL.4.2 - Site Class <br />The authority having jurisdiction (not the USGS), site-specific aeotechnical data, and/or <br />the default has classified the site as Site Class D, based on ttc slt soil prop€rti{E in <br />accordance with Chapter 20. <br />Table 20.3-1 Site Classification <br />Site Class F or w.n <br />A. Hard Rock > 5.000 ftls <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 ftls <15 <br />Any profile !,ith more than 10 ft of soil having <br />characteristics: <br />. Plasticity index PI > 20, <br />. Moisture content !v >- 40o/o, and <br />. Undrained shear strength;, < 5OO psf <br />< 1,000 psf <br />the <br />F. Soils requiring site response <br />analysis in accordance with Section <br />2I.7 <br />For SIi 1ft/s = 0.3048 m/s llblft, = 0.0479 kN/m, <br />;" <br />See Section 20.3.1