Investigation on the Effect of Near-Fault Earthquake on Double Concave Friction Pendulum (DCFP) Base Isolated Buildings

摘要

Near-fault earthquakes have different properties compared to far-fault earthquakes. Due to the phenomenon of forward directivity in near-fault earthquakes, the component perpendicular on fault has pulses with longer periods and wider range than the parallel component. Seismic isolators as the types of damping systems prevent structure to enter into non-linear range through their deformation. In this study, Single Degree of Freedom Structures (SDOFS), which are connected to FPS and DCFP isolators, was analyzed under time history implementing the records of near-fault and far-fault earthquakes. In addition, base shear, displacements, and acceleration incurred on the foundation of upper structure were examined. The obtained results indicated that in comparison with DCFP isolator, FPS isolator transfers less base shear on its structure in near-fault earthquake, whereas in comparison with FPS isolator, DCFP isolator transfers less displacements on its structure in near-fault earthquake. In addition, it transfers smaller acceleration on its foundation in near-fault and far-fault earthquakes.