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The pseudodynamic (PSD) test method combines the numerical integration of the motion equations of a structure condensed at selected degrees-of-freedom (dof) with the on-line measurement of the reaction forces needed to impose this computed motion. The results obtained with this testing method can be strongly corrupted by the spurious propagation of experimental errors. The alpha-operator splitting (alpha-OS) scheme, a convenient linearization of the so-called alpha-method, is a non-iterative implicit time integration scheme. As such, it is a good candidate for PSD testing since it provides the unconditional stability sometimes needed when the number of dof is large, while preserving the implementation simplicity of explicit schemes. The properties of the alpha-OS scheme are presented with special emphasis on its error propagation characteristics. These properties are compared with the ones of corresponding iterative implicit schemes. It is shown in particular that, in contrast with what is observed using iterative schemes, the selective damping possibility associated with the alpha factor become a crucial ingredient for the success of the alpha-OS scheme.

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Authors: COMBESCURE D, JRC Ispra (IT);PEGON P, JRC Ispra (IT)
Bibliographic Reference: Article: Soil Dynamics and Earthquake Engineering
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