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Elimination of spurious higher‐mode response in pseudodynamic tests
Author(s) -
Shing PuiShum B.,
Mahin Stephen A.
Publication year - 1987
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290150403
Subject(s) - spurious relationship , stiffness , tangent , computation , viscous damping , numerical analysis , mode (computer interface) , frequency response , mechanics , structural engineering , mathematics , mathematical analysis , physics , engineering , computer science , vibration , acoustics , geometry , algorithm , statistics , operating system , electrical engineering
In a pseudodynamic test, errors in restoring‐force feedback are introduced into numerical computations. Some of these errors can excite the higher‐frequency response of the specimen. In this paper, the use of viscous and numerical dampings to eliminate spurious higher‐frequency effects is studied. Since the tangent stiffness of a non‐linear specimen cannot be measured accurately, initial‐stiffness‐dependent viscous damping is considered. In addition, an explicit integration algorithm with desired numerical damping properties is proposed and examined. The analytical and numerical studies presented indicate that viscous‐damping properties can be substantially changed by non‐linear deformations. For this reason, the use of numerical damping appears to be more advantageous.