4.5 Article

Parameter identification of degrading and pinched hysteretic systems using a modified Bouc-Wen model

期刊

STRUCTURE AND INFRASTRUCTURE ENGINEERING
卷 14, 期 12, 页码 1573-1585

出版社

TAYLOR & FRANCIS LTD
DOI: 10.1080/15732479.2018.1469652

关键词

Nonlinear analysis; mathematical models; evolutionary computation; optimisation; identification; structural behaviour; bridges; piers

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The Bouc-Wen (BW) model is a successful differential equations model used to describe a wide range of nonlinear hysteretic systems. However, it is unable to describe force degradation, stiffness degradation and pinching effects. Therefore, Baber and Noori proposed a generalisation, developing the Bouc-Wen-Baber-Noori (BWBN) model. Nevertheless, it is composed of many parameters and complex pinching and degrading functions. Thus, it is necessary to develop a simpler and reliable model to be used for practical applications. In this paper, a modified BW model is proposed. It involves a more direct physical meaning of each parameter and allows achieving a substantial reduction of computational effort and numerical deficiencies. This is obtained through simpler pinching and degrading functions that entail a decrease of the number of parameters. The result is a straightforward model, capable of predicting the behaviour of degrading and pinched hysteretic systems. An application of the proposed scheme to a real case is also presented, in which reinforced concrete bridge piers that were physically tested in the laboratory are considered. The force-displacement data are used to perform the identification process of the model parameters via a Genetic Algorithm. The numerical results are accurate since they coincide with the experimental ones.

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