Abstract:The distance between the faults of near-fault ground motions is generally within 20km. Since the reflection and transmission times of seismic waves in different rock formations are much smaller than those of far-fault ground motions, they generally do not meet the assumption of vertical incidence when they reach the surface. At present, few studies on the seismic resistance of asphalt concrete core dams consider the impact of near-fault ground motion oblique input. This paper selects the appropriate near-fault pulse-type ground motion records, and derives the equivalent nodal force formula under the complete wavefield decomposition scheme of the two-dimensional foundation side and bottom boundary when the P wave is incident obliquely, and simulates asphalt concrete through the near-fault P wave wave oblique input The core wall dam is subjected to near-field seismic waves. The influence of the near-fault P-wave pulse characteristics and input angle on the acceleration, stress, curvature of the asphalt concrete core wall and permanent deformation of the dam is analyzed. The results show: Comparing the dynamic response of the core wall and the dam when the seismic wave is incident vertically and obliquely, there are obvious differences. The characteristics of the near-fault ground motion pulse have a significant impact on each response.
宋志强,刘琳,王飞,刘云贺. 近断层P波斜入射下沥青混凝土心墙坝响应分析[J]. 振动与冲击, 2023, 42(7): 245-253.
SONG Zhiqiang, LIU Lin, WANG Fei, LIU Yunhe. Response analysis of asphalt concrete core dam under oblique incidence of near-fault P-wave. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(7): 245-253.
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