Stochastic analysis of the linear equivalent response of bridge piers with aseismic devices

Description

The dynamic response of bridge piers with aseismic devices to earthquake excitation is evaluated by the stochastic equivalent linearization technique. The seismic acceleration is schematized through a Gaussian stationary random process. The pier is linear elastic, the span is idealized as a rigid mass, the device restoring force is represented through a non linear differential model. The study of the complex modes of the linearized system gives an interpretation of the mechanical behaviour and highlights some phenomena which are typical of the hysteretic systems marked by weak hardening.Even though the solution is in the stationary field, it brings out several considerations about the effective non stationary behaviour of the structure.

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