Failure of Double Friction Pendulum Bearing Under Pulse Excitations

Abstract eng:
Although the global behavior of double friction pendulum bearings (DFP) has been widely studied, the failure behavior has not been significantly investigated. Understanding how and if the bearing will fail is important for both capacity based design and performance based design concepts. To look into failure, a model based on the theory of rigid body kinematics, rigid body dynamics and contact mechanics is employed with an added parallel non-linear damper with Hertz’s contact law to explicitly consider the energy dissipation. Analytical Ricker pulses, including symmetric and antisymmetric Ricker pulses are selected as input excitations. For each combination of pulse amplitude and period, there are three possible outcomes for the bearing: no impact in which the bearing does not reach its maximum displacement, impact without failure in which the bearing reaches its maximum displacement limit but continues to function, and failure. These responses can be represented on an impact region spectrum, which shows that the responses tend to be continuous. The impact region spectrum can be directly used to determine the final status of the bearing when it is subjected to a Ricker pulse with specific amplitude and period. For design, Ricker pulse parameters can be extracted from site-specific pulse-type ground motions to predict the performance of the structure. However, the shape of the impact region spectrum can be influenced by different design parameters of the DFP, including radius of curvature, friction coefficient, restrainer height etc. Their influences on the shape of the impact region spectrum are investigated.

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