AP/VP specific inelastic displacement ratio for seismic response estimation of structures

Durucan, Caner; Dicleli, Murat

doi:10.1002/eqe.2500

Cited by 28 publications

(25 citation statements)

References 32 publications

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“…The first yielding in the superstructure pushover curve is assumed as a point of excursion into the nonlinear range (secondary slope of bilinear idealization). It has been clearly observed in previous studies that predicting the inelastic demand of structures is relatively correlated with the frequency content of earthquake excitation . Thus, earthquake records are carefully selected to highlight most features of NF and FF ground motions.…”

Section: Objective and Methodology Of Researchmentioning

confidence: 99%

“…A p / V p ratio as a reliable parameter is used to characterize the frequency content of selected records. It is noteworthy that researchers have demonstrated the effects of A p / V p ratio on structural responses such as structural damage, the inelastic displacement ratio of SDOF systems, the seismic response of BI structures, and the development of equivalent linearization model for base isolation systems . Meanwhile, some predictive equations have been proposed for A p / V p ratio to facilitate the evaluation of seismic responses …”

Section: Objective and Methodology Of Researchmentioning

confidence: 99%

“…Meanwhile, compared with Figure C, D, G, and H, Figure A, B, E, and F depict the effect of mass ratio. The effects of T b are illustrated in Figure A, C, E, and G and Figure B, D, F, and H. It is observed that power function form Y = aX b is governed to represent C 1 trend based on A p / V p ratio as reported in Durucan and Dicleli . The comparison of Figure K, L, O, and P with the rest of the plots points out to the fact that superstructures with higher masses and postyield stiffness ratios represent the least slopes of variations against A p / V p ratios.…”

Section: Effective Parametersmentioning

confidence: 99%

“…More recently, different frequency contents of near‐fault (NF) pulse‐like and far‐fault (FF) ground motions have been recognized as crucial and need to be taken into account in C 1 predictive equations. It is noteworthy that the frequency content has commonly been characterized by pulse period ( T p ) and the ratio of peak ground acceleration ( A p ) to peak ground velocity ( V p ) …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of inelastic displacement ratio for base‐isolated structures

Yaghmaei‐Sabegh

Safari

Ghayouri

2017

Earthq Engng Struct Dyn

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Summary This study develops a straightforward approximate method to estimate inelastic displacement ratio, C1 for base‐isolated structures subjected to near‐fault and far‐fault ground motions. Taking into account the inelastic behavior of isolator and superstructure, a 2 degrees of freedom model is employed. A total of 90 earthquake ground motions are selected and classified into different clusters according to the frequency content features of records represented by the peak ground acceleration to peak ground velocity ratio, Ap/Vp. A parametric study is conducted, and effective factors in C1 (i.e., fundamental vibration period of the superstructure, Ts; postyield stiffness ratio of the superstructure, αs; strength reduction ratio, R; vibration period of the isolator, Tb; strength of the isolator, Q; ratio of superstructure mass to total mass of the system, γm) are recognized. The results indicate that the practical range of C1 values could be expected for base‐isolated structures. Subsequently, effective parameters are included in simple predictive equations. Finally, the accuracy of the proposed approximate equations is evaluated and verified through error measurement, and comparisons are made in the analyses.

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Section: Objective and Methodology Of Researchmentioning

confidence: 99%

Section: Objective and Methodology Of Researchmentioning

confidence: 99%

Section: Effective Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of inelastic displacement ratio for base‐isolated structures

Yaghmaei‐Sabegh

Safari

Ghayouri

2017

Earthq Engng Struct Dyn

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“…24,25 Despite the potential significance of different seismic demands resulting from the two types of velocity pulses, investigations on this topic are limited, except for a few pioneer studies. To the best of our knowledge, authough there are plenty of studies contributing to the subject of C R , [29][30][31][32][33][34][35] no efforts have been devoted to analyzing the differences in terms of C R that are introduced by velocity pulses having different characteristics. In this regard, a new algorithm 26 for automatically classifying acc-pulses and non-acc-pulses can be implemented to perform a comparative study to reveal how the velocity pulses of different characteristics may affect the inelastic response of structures.…”

Section: Introductionmentioning

confidence: 99%

Near‐fault acceleration pulses and non‐acceleration pulses: Effects on the inelastic displacement ratio

Chang

Luca

Goda

2019

Earthq Engng Struct Dyn

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Summary Near‐fault ground motions can impose particularly high seismic demands on the structures due to the pulses that are typically observed in the velocity time‐histories. The velocity pulses can be further categorized into either a distinct acceleration pulse (acc‐pulse) or a succession of high‐frequency, one‐sided acceleration spikes (non‐acc‐pulse). The different characteristics of velocity pulses imply different frequency content of the ground motions, potentially causing different seismic effects on the structures. This study aims to investigate the characteristics of the two types of velocity pulses and their impacts on the inelastic displacement ratio (CR) of single‐degree‐of‐freedom systems. First, a new method that enables an automated classification of velocity pulses is used to compile a ground motion dataset which consists of 74 acc‐pulses and 45 non‐acc‐pulses. Several intensity measures characterizing different seismological features are then compared using the two groups of records. Finally, the influences of acc‐pulses and non‐acc‐pulses on the CR spectra are studied; the effects of pulse period and hysteretic behavior are also considered. Results indicate that the characteristics of the two types of velocity pulses differ significantly, resulting in clearly distinct CR spectral properties between acc‐pulses and non‐acc‐pulses. Interestingly, mixing acc‐pulses and non‐acc‐pulses can lead to local “bumps” that were found in the CR spectral shape by previous studies. The findings of this study highlight the importance of distinguishing velocity pulses of different types when selecting near‐fault ground motions for assessing the nonlinear dynamic response of structures.

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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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A_P/V_P specific inelastic displacement ratio for seismic response estimation of structures

Cited by 28 publications

References 32 publications

Estimation of inelastic displacement ratio for base‐isolated structures

Estimation of inelastic displacement ratio for base‐isolated structures

Near‐fault acceleration pulses and non‐acceleration pulses: Effects on the inelastic displacement ratio

A statistical study of inelastic displacement ratio spectrum for existing structures

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