design-category-factory

Factory for computing seismic design category values based on a ground motion and risk category.

This will work in much the same way as the SiteAmplificationFactory except it will use "risk category" instead of "site class".

Abstract a "lookup-data" factory from which both site-amplification-factory and design-category-factory can extend. Update site-amplification-factory to extend this new abstract class.

Here is some helpful code (Java)

    protected static class Default implements Impl {
        protected static final double[] sdsThresholds = {0, 0.167, 0.33, 0.50};
        protected static final char[][] sdsMap = {
            {'A', 'B', 'C', 'D'},
            {'A', 'B', 'C', 'D'},
            {'A', 'B', 'C', 'D'},
            {'A', 'C', 'D', 'D'},
        };

        protected static final double[] sd1Thresholds = {0, 0.067, 0.133, 0.20};
        protected static final char[][] sd1Map = {
            {'A', 'B', 'C', 'D'},
            {'A', 'B', 'C', 'D'},
            {'A', 'B', 'C', 'D'},
            {'A', 'C', 'D', 'D'},
        };

        public char calculateDesignCategory(String riskCategory, double s1, double sds, double sd1) {
            if (riskCategory.equals("N")) return 'N';

            if ((riskCategory.equals(RISK_CATEGORY_I) ||
                riskCategory.equals(RISK_CATEGORY_II) ||
                riskCategory.equals(RISK_CATEGORY_III)) &&
                s1 >= 0.75) {
                    return 'E';
            } else if (riskCategory.equals(RISK_CATEGORY_IV) &&
                       s1 >= 0.75) {
                    return 'F';
            } else {
                char sdsCategory = calcCategoryFromMap(riskCategory, sdsMap, sdsThresholds, sds);
                char sd1Category = calcCategoryFromMap(riskCategory, sd1Map, sd1Thresholds, sd1);

                return sdsCategory > sd1Category ? sdsCategory : sd1Category;
            }
        }
    }