The Velocity Evolution of an Isolated Element in a Friction Pendulum for Different Sliding Surfaces

摘要

In this paper, the velocity evolution for a structure isolated by friction pendulums (FP) with diverse sliding surfaces is presented. The surfaces are characterized by the curvature; as reference a cylindrical surface is considered and compared against surfaces generated by several polynomials. The position and velocity of the isolated element in different time moments is derived analytically for all surfaces, in order to evaluate the energy loss due to friction. This aspect is important because the materials used in manufacturing of seismic isolation devices can be sensitive to temperature variations, manifested by changing of the physical and mechanical properties. Findings of the study presented in this paper have practical importance, constituting guidelines for friction pendulum design.