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42 Figure 5-5. Distribution of the magnitude and distance from source for the records in the USNRC Earthquake Catalog. 5.2.3 Permanent Displacement Data Newmark sliding block method for calculation of permanent displacements due to earthquake time histories. Permanent displacement is a characteristic of the strong motion record, as well as the ratio of the structure yield ac- celeration to peak ground acceleration in the sliding mass 5.2.4 Microsoft Access Database (ky /kmax) of the subject structure. Using the strong motion To evaluate the correlations between different parameters in records in the USNRC catalog, permanent displacements have the USNRC earthquake catalog, an Access database has been been calculated for ky /kmax values in the range of 0.01 to 1. developed. The database comprises two tables, one for storage A nonsymmetrical displacement scheme was assumed in these of basic record information (INFOTAB), and a second table analyses, meaning that the displacement occurs in one direc- (NEWMARK) for storage of permanent displacement data. tion and is not reversible. Figure 5-6 shows the concept of the Figure 5-7 shows a schematic diagram for the ground motion Figure 5-6. Illustration of Newmark's sliding block method for estimation of permanent displacement due to earthquake.