Generalized-α methods for seismic structural testing

Alessio Bonelli

doi:10.1002/eqe.390

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Generalized-α methods for seismic structural testing

2004-06-28

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Alessio Bonelli *

Oreste S. Bursi

DOI：10.1002/eqe.390

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Abstract

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his paper presents novel predictor-corrector time-integration algorithms based on the Generalized-alpha method to perform pseudo-dynamic tests with substructuring. The implicit Generalized-g algorithm was implemented in a predictor-one corrector form giving rise to the implicit IPC-p(infinity) method, able to avoid expensive iterative corrections in view of high-speed applications. Moreover, the scheme embodies a secant stiffness formula that can closely approximate the actual stiffness of a structure. Also an explicit algorithm endowed with user-controlled dissipation properties, the EPC-P-b method, was implemented. The resulting schemes were tested experimentally both on a two- and on a six-degrees-of-freedom system, using substructuring. The tests indicated that the numerical strategies enhance the fidelity of the pseudo-dynamic test results even in an environment characterized by considerable experimental errors. Moreover, the schemes were tested numerically on severe non-linear substructured multiple-degrees-of-freedom systems reproduced with the Bouc-Wen model, showing the reliability of the seismic tests under these conditions. Copyright (C) 2004 John Wiley Sons, Ltd.

Keywords:

pseudo-dynamic test

substructured environment

generalized-alpha methods

predictor-corrector technique

error propagation analysis

secant stiffness technique

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