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This paper describes a modal weighting technique that improves the stability characteristics of explicit time integration schemes used in structural dynamics. The central difference method was chosen as the trial algorithm because of its simplicity, both in terms of formulation and ease of numerical stability and convergence analysis. It is shown how explicit algorithms may be re-formulated in order to make them stable for any integration time step by attenuating high frequency oscillation modes that are generated by mesh geometry rather than generic dynamical features. Results from trial calculations obtained from mathematical models that represent hysteretic restoring force elements are discussed, as well as an application on a physical, four-degree-of-freedom, base-isolated structure using the pseudodynamic technique.

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Authors: GUTIÉRREZ E, JRC Ispra (IT);LÓPEZ CELA J J, Universidad de Castilla-La Mancha, ETS Ingenieros Industriales, Cuidad Real (ES)
Bibliographic Reference: Article: Earthquake Engineering and Structural Dynamics (1998)
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