Influence of friction coefficient on the Shear Forces of a TPFB Using FEM
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Mechanical systems like friction isolators and friction pendulum systems (FPS) are integrated into structures to mitigate the adverse impacts of earthquakes. These systems absorb a portion of the energy exerted on buildings during seismic activity, thereby reducing structural responses. In such systems, the coefficient of friction influences shear forces and displacements; as shear forces increase, displacements and restoring forces decrease. The mechanical behavior of FPS can be simulated using the finite element method (FEM), where the hysteresis curve remains complete and consistent, affirming the accuracy of the theoretical model and the results derived from such analyses. This study aims to develop a finite element model of a triple pendulum isolator to examine how the friction coefficient affects shear forces and to assess the viability of this technique for isolation system analysis. For this purpose, a nonlinear dynamic analysis of the isolator under compression was performed, varying the friction coefficients using finite element modeling software. Upon comparing the hysteresis, it was observed that for friction coefficients of 6% and 7%, the shear forces increased, but the maximum displacements decreased. For a friction coefficient of 5%, it was noted that the displacements and shear forces were lower compared to the other two models. Furthermore, it can be concluded that applying FEM models in isolation systems is safe and practical, as these results were validated through investigations using experimental and numerical models via structural analysis software.
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