Parameter identification for degrading and pinched hysteretic structural concrete systems

Kunnath, Sashi K.; Mander, John B.; Lee, Fang

doi:10.1016/s0141-0296(96)00058-2

Cited by 89 publications

(47 citation statements)

References 7 publications

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“…Paper [173] describes an iterative least squares procedure based on a modified Gauss-Newton approach to perform the parameter identification of an extended version of the BoucWen model that accounts for strength and stiffness degradation by [18].…”

Section: Least-squares Based Identificationmentioning

confidence: 99%

The Hysteresis Bouc-Wen Model, a Survey

Ismail¹,

Ikhouane²,

Rodellar³

2009

Arch Computat Methods Eng

637

314

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Structural systems often show nonlinear behavior under severe excitations generated by natural hazards. In that condition, the restoring force becomes highly nonlinear showing significant hysteresis. The hereditary nature of this nonlinear restoring force indicates that the force cannot be described as a function of the instantaneous displacement and velocity. Accordingly, many hysteretic restoring force models were developed to include the time dependent nature using a set of differential equations. This survey contains a review of the past, recent developments and implementations of the Bouc-Wen model which is used extensively in modeling the hysteresis phenomenon in the dynamically excited nonlinear structures.

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Section: Least-squares Based Identificationmentioning

confidence: 99%

The Hysteresis Bouc-Wen Model, a Survey

Ismail¹,

Ikhouane²,

Rodellar³

2009

Arch Computat Methods Eng

637

314

View full text Add to dashboard Cite

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“…It has been used in an ample range of applications such as vibration of concrete structures (Kunnath et al, 1997), wood joints (Foliente, 1995;Ajavakom et al, 2008), among others.…”

Section: Analytical Modelmentioning

confidence: 99%

Behavior of precast ferrocement thin walls under cyclic loading: an experimental and analytical study

Bedoya-Ruíz¹,

Ortiz²,

Álvarez³

2014

ing.inv.

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Thin ferrocement walls are the structural elements that comprise the earthquake resistant system of housing built with this material. This article presents the results drawn from an experimental campaign carried out over full-scale precast ferrocement thin walls, which were assessed under cyclic loading conditions. The tests assessed the strength of the walls, their hysteretic behavior, ductility, energy dissipation, equivalent damping, their coefficient of energy dissipation and their characteristic failure mode when subjected to cyclic loading conditions. Finally, an analytical model that modeled the nonlinear dynamic behavior exhibited by ferrocement walls was implemented; its feasibility and potential use in earthquake resistant design of ferrocement walls was evaluated.Keywords: Precast ferrocement walls, cyclic loading, ductility, Bouc-Wen-Baber-Noori model, earthquake resistant design. RESUMENLos muros de ferrocemento de pared delgada son los elementos estructurales, que conforman el sistema sismo resistente de viviendas construidas con este material. En este artículo se presentan los resultados obtenidos de una campaña experimental; llevada a cabo sobre muros prefabricados de pared delgada a escala real, los cuales fueron evaluados bajo ensayos de carga cíclica. Los ensayos permitieron evaluar: la resistencia, el comportamiento histerético, la ductilidad, la disipación de energía, el amortiguamiento equivalente, el coeficiente de disipación de energía y los modos de falla característicos de los muros de ferrocemento bajo carga cíclica. Al final, se implementó un modelo analítico que captura el comportamiento no lineal, exhibido por los muros de ferrocemento bajo carga cíclica y se evalúo la factibilidad y su potencial uso en el diseño sismo resistente de muros realizados en dicho material.Palabras clave: muros prefabricados de ferrocemento, carga cíclica, ductilidad, modelo de Bouc-Wen-Baber-Noori y diseño sismoresistente.

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“…Additionally, a low a=v ratio, for example, characterizes a soft-soil site while a high a=v ratio characterizes a ÿrm or rock-soil site. These e ects are illustrated in Figure 2, which plots the variation of the elastic ampliÿcation factor a as deÿned by Equation (11). Note that the in uence of soil type is re ected not in the amplitude but in the spectral shape.…”

Section: Elastic Seismic Design Spectrummentioning

confidence: 99%

“…A parametric study was carried out to evaluate the e ect of di erent hysteresis shapes on the dissipated energy. A pinched smooth hysteresis model based on the Baber-Noori formulation [10] but extended by Kunnath et al [11] to include sti ness degradation and strength deterioration was used in the evaluation. Three model types were considered: bilinear, to represent non-degrading systems such as steel; degrading, to represent moderate degrading e ects in structures with well-detailed concrete members; and pinched-degrading, to represent severely degrading systems with very limited energy dissipation capacity.…”

Section: In Uence Of Hysteretic Shape On Energy Demandmentioning

confidence: 99%

Cumulative damage‐based inelastic cyclic demand spectrum

Kunnath

Chai

2003

Earthq Engng Struct Dyn

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SUMMARYThe estimation of cyclic deformation demand resulting from earthquake loads is crucial to the core objective of performance-based design if the damage and residual capacity of the system following a seismic event needs to be evaluated. A simpliÿed procedure to develop the cyclic demand spectrum for use in preliminary seismic evaluation and design is proposed in this paper. The methodology is based on estimating the number of equivalent cycles at a speciÿed ductility. The cyclic demand spectrum is then determined using well-established relationships between seismic input energy and dissipated hysteretic energy. An interesting feature of the proposed procedure is the incorporation of a design spectrum into the proposed procedure. It is demonstrated that the force-deformation characteristics of the system, the ductility-based force-reduction factor R , and the ground motion characteristics play a signiÿcant role in the cyclic demand imposed on a structure during severe earthquakes. Current design philosophy which is primarily based on peak response amplitude considers cyclic degradation only in an implicit manner through detailing requirements based on observed experimental testing. Findings from this study indicate that cumulative e ects are important for certain structures, classiÿed in this study by the initial fundamental period, and should be incorporated into the design process.

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Parameter identification for degrading and pinched hysteretic structural concrete systems

Cited by 89 publications

References 7 publications

The Hysteresis Bouc-Wen Model, a Survey

The Hysteresis Bouc-Wen Model, a Survey

Behavior of precast ferrocement thin walls under cyclic loading: an experimental and analytical study

Cumulative damage‐based inelastic cyclic demand spectrum

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