地震作用下高土石坝-无限地基相互作用效应OA

The lack of understanding of the dynamic interaction mechanism between rockfill dams and founda-tions has led to the prevalent adoption of simplified vibration input methods in engineering practice,whereas the more rational wave input method has not yet been popularized.To quantify the dynamic interaction effects between structures and foundations,the free-field influence factor was proposed.By comparing the dynamic responses of rockfill dams,gravity dams,and high-rise buildings,the influence laws of structural stiffness and mass on dynamic interaction were clarified.The results indicate that both structural stiffness and mass exert significant impacts on the interaction effects,and the mass factor is more critical.At the same height,the mass of the rockfill dam is far greater than that of concrete dams and high-rise buildings;thus,the dynamic in-teraction between rockfill dams and foundations cannot be ignored.When the height of the rockfill dam ex-ceeds 100 m,the free-field acceleration influence factor is greater than 16.8%,and the error of dam crest ac-celeration calculated by the vibration input method exceeds 12.2%.It is recommended to use the seismic input method which can consider dam-foundation dynamic interaction in the seismic analysis of high rockfill dams.