3-D Reproduction Analyses For Actual Earthquake Behaviors Of Existing Dams
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Results evaluated by dynamic analysis method will be significantly affected by the values of dynamic property. Therefore, the dynamic property values should be quantitatively evaluated based on actual earthquake phenomena in order to realize reliable dynamic analysis. I have developed 3-D nonlinear dynamic analysis method for coupled dam-joints-foundation-reservoir system and in order to verify the validity of the method developed, I have made 3-D reproduction analyses for actual earthquake behaviors of existing dams. By these reproduction analyses, the dynamic property values of dam and foundation have been evaluated quantitatively. Furthermore, the efficiency of the analytical method developed has been proved. The 3-D reproduction analysis for the actual earthquake behavior of an existing dam is necessary to verify the efficiency of the dynamic analysis method. Effective utilization of the earthquake motions observed is important for realizing accurate and reliable evaluation for seismic safety of structures. Keywords: earthquake safety, 3-D dynamic analysis, verification, earthquake observation, dynamic property. 1 Introduction Confirmation and securing of dam safety against large earthquakes is very important subject in earthquake countries. With the rapid improvement of numerical analysis techniques, a 3-D dynamic analysis method has come to be applied for earthquake safety evaluation of existing dams. The stresses and strains calculated by the dynamic analysis procedure will be largely changed according to the dynamic property values. Among the dynamic properties, the dynamic shear modulus (or shear wave velocity) and the damping factor are the
earthquake safety, 3-D dynamic analysis, verification, earthquake observation, dynamic property.