engineered earth structure. 3 3.15 Three categories of Modify as follows: Type 1 sites: > 1100 sites are specified in Vs the draft.. However, m/s; detailed guidance is Type 2 sites: < 1100 Vs provided only for m/s; two types of sites, Type 3 sites: 300m/s > one with sites having Vs; Vs>1100m/s and second where sites have Vs <1100 m/s. No specific guidance is included for type 3 sites (Vs<300m/s). Hence it is suggested that classification can be reduced to just two groups as suggested, or guidance, as appropriate for sites with Vs<300m/s can be added.. 4 3.16 The proposed Add following after section approach for 3.16: development of Heterogeneity of the soil motion from site should be captured response analysis appropriately by using at requires convolution least 60 randomized shear of bedrock hazard wave velocity profiles curves using paired with 60 sets of compatible time randomized shear modulus histories to free field. and damping curves (i.e.,
engineered earth structure. 3 3.15 Modify as follows: Type 1 sites: Vs > 1100 m/s; Type 2 sites: Vs < 1100 m/s; Type 3 sites: 300m/s > Vs; Three categories of sites are specified in the draft.. However, detailed guidance is provided only for two types of sites, one with sites having Vs>1100m/s and second where sites have Vs <1100 m/s. No specific guidance is included for type 3 sites (Vs<300m/s). Hence it is suggested that classification can be reduced to just two groups as suggested, or guidance, as appropriate for sites with Vs<300m/s can be added.. 4 3.16 Add following after section 3.16: Heterogeneity of the soil should be captured appropriately by using at least 60 randomized shear wave velocity profiles paired with 60 sets of randomized shear modulus and damping curves (i.e., The proposed approach for development of motion from site response analysis requires convolution of bedrock hazard curves using compatible time histories to free field.
Review_CommentsforDS490_AERB.docx