Inelastic Displacement Ratios of Degrading Systems

Chenouda, Mouchir; Ayoub, Ashraf

doi:10.1061/(asce)0733-9445(2008)134:6(1030)

Cited by 39 publications

(34 citation statements)

References 24 publications

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“…3) The Modified Krawinkler and Nassar method [23] is the most accurate equation compared to the other classical methods. It slightly underestimates the inelastic displacement ratios of SDOF systems with strength reduction factors (R) equal to 3, 4 and 5 at very short periods.…”

Section: Discussionmentioning

confidence: 99%

“…1) described in detail in Chenouda and Ayoub [23]. The model uses an eightparameter energy approach to account for strength, unloading stiffness, accelerated stiffness, and cap degradation under cyclic loads.…”

Section: Validation Of Numerical Modelmentioning

confidence: 99%

“…The first equation is the modified Krawinkler and Nassar equation for modified Clough systems, and is proposed by Chenouda and Ayoub [23]: (1) (2) where a = 0.7 and…”

Section: Displacement Estimates Of Rc Structural Columnsmentioning

confidence: 99%

“…The constant b was recalibrated later by Chenouda and Ayoub [23] to fit modified Clough systems and was found to be equal to 2.2.…”

Section: Displacement Estimates Of Rc Structural Columnsmentioning

confidence: 99%

“…In another study, Chopra and Chintanapakdee [22] investigated the inelastic displacement ratio of new and existing structures which were modeled as non-degrading elasto-plastic and bilinear systems subjected to 214 earthquake records. Chenouda and Ayoub [23,24] and Ayoub and Chenouda [25] developed a new energy-based model, which takes several degradation effects into account, to perform dynamic analysis and predict collapse of structures subjected to seismic excitation. Bilinear and modified Clough models [4] were used in this study.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fuzzy-logic based inelastic displacement ratios of degrading RC structures

Ozkul¹,

Ayoub²,

Altunkaynak³

2014

Engineering Structures

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Section: Discussionmentioning

confidence: 99%

Section: Validation Of Numerical Modelmentioning

confidence: 99%

“…The first equation is the modified Krawinkler and Nassar equation for modified Clough systems, and is proposed by Chenouda and Ayoub [23]: (1) (2) where a = 0.7 and…”

Section: Displacement Estimates Of Rc Structural Columnsmentioning

confidence: 99%

“…The constant b was recalibrated later by Chenouda and Ayoub [23] to fit modified Clough systems and was found to be equal to 2.2.…”

Section: Displacement Estimates Of Rc Structural Columnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fuzzy-logic based inelastic displacement ratios of degrading RC structures

Ozkul¹,

Ayoub²,

Altunkaynak³

2014

Engineering Structures

Self Cite

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A statistical study of inelastic displacement ratio spectrum for existing structures

Banerjee

Gupta

2022

Earthquake Engineering and Resilience

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Displacement‐based design has gained importance due to the emergence of the performance‐based engineering, and it has now become desirable to estimate maximum (inelastic) displacements of structures for different levels of seismic hazard. Being closely related to damage, displacement (or drift) has become an important parameter necessary to meet various performance goals. It is considered convenient to estimate the inelastic displacement demand in a structure by multiplying the elastic displacement demand of the structure with a ratio called the inelastic displacement ratio. A comprehensive study is conducted for the parametric dependence of the inelastic displacement ratio in single‐degree‐of‐freedom (SDOF) systems with known relative lateral strengths, on strong motion duration, earthquake magnitude, epicentral distance, and geological site conditions. This study is different from the earlier studies of similar types in that other governing parameters are kept fixed while the effects of variations in any particular parameter are studied. This study is based on the generation of ensembles of synthetic accelerograms from a database of 1274 accelerograms recorded in western USA for the pseudospectral acceleration (PSA) spectra of given source and site parameters. It is found that strong motion duration may influence the inelastic displacement ratios, depending on the hysteretic properties of the oscillator, in the case of durations not much longer than 10 s. Earthquake magnitude has a significant influence on these ratios for the SDOF systems of most periods, while site geology appears to be important for the stiff oscillators. A scaling model is also proposed in this study for estimating the inelastic displacement ratio spectrum from a normalized relative velocity spectrum of the ground motion. The proposed model indirectly includes the effects of various governing parameters and is shown to preserve the trends available from the direct study.

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Inelastic displacement demand of bridge columns considering shear–flexure interaction

Zhang

Tang

2010

Earthq Engng Struct Dyn

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SUMMARYReinforced concrete bridge columns exhibit complex hysteretic behavior owing to combined action of shear, bending moment, and axial force under multi-directional seismic shakings. The inelastic displacement of columns can be increased by shear-flexure interaction (SFI). This paper develops a simple yet reliable demand model for estimating the inelastic displacement and ductility based on the nonlinear time history analyses of 24 full-size columns subject to a suite of near-fault ground motions. A coupled hysteretic model is used to simulate the shear-flexure interactive (SFI) behavior of columns and the accumulated material damage during loading reversals, including pinching, strength deterioration, and stiffness softening. Guided by rigorous dimensional analysis, the inelastic displacement responses of bridge columns are presented in dimensionless form showing remarkable order. A dimensionless nonlinearity index is derived taking into account of the column strength, ground motion amplitude, and softening or hardening postyield behavior. Strong correlation is revealed between the normalized inelastic displacement and the dimensionless structure-to-pulse frequency, the dimensionless nonlinearity index as well as the aspect ratio. Two regressive equations for displacement and ductility demands are proposed and validated against the simulation results. The SFI effects are discussed and included explicitly through the aspect ratio in the proposed model. This study offers a new way to realistically predict the inelastic displacement of columns directly from structural and ground motion characteristics.

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Inelastic Displacement Ratios of Degrading Systems

Cited by 39 publications

References 24 publications

Fuzzy-logic based inelastic displacement ratios of degrading RC structures

Fuzzy-logic based inelastic displacement ratios of degrading RC structures

A statistical study of inelastic displacement ratio spectrum for existing structures

Inelastic displacement demand of bridge columns considering shear–flexure interaction

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