A preliminary prediction of seismic damage‐based degradation in RC structures

Gupta, Vinay K.; Nielsen, Søren R.K.; Kirkegaard, Poul Henning

doi:10.1002/eqe.45

Cited by 22 publications

(11 citation statements)

References 9 publications

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“…This study uses a modiÿed Clough-Johnston oscillator which is elasto-plastic in nature and undergoes stiness and strength degradations. This has been proposed by Gupta et al [16]. In this model, the strength degradation is considered to be a function of two additional system parameters, besides natural frequency and damping ratio, and accumulated plastic deformations.…”

Section: Raw Datamentioning

confidence: 97%

“…The sti ness deterioration is characterized by the instantaneous values of yield displacement level and accumulated plastic deformations. For a given n, the ductility supply ratio may be estimated as 3:44n 0:31 [16]. The damping is assumed to be F-damping (i.e., with no e ect of non-linear behaviour) with a value equal to 5% of critical damping.…”

Section: Raw Datamentioning

confidence: 99%

“…A design spectrum is generally obtained by applying statistical analysis and using engineering judgement on pseudo-acceleration 191 sti ness and strength degradations. To this end, the scaling model proposed by Tiwari and Gupta [14] for elasto-plastic oscillators has been considered for regression analysis in the case of the SRF spectra obtained for the oscillator proposed by Gupta et al [16]. This oscillator considers the initial yield displacement level and ductility supply-related parameter as two additional input parameters.…”

Section: Introductionmentioning

confidence: 99%

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Scaling of strength reduction factors for degrading elasto-plastic oscillators

Chakraborti

Gupta

2005

Earthquake Engng Struct. Dyn.

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SUMMARYThe inelastic (design) spectra characterizing a seismic hazard are generally obtained by the scalingdown of the elastic (design) spectra via a set of response modiÿcation factors. The component of these factors, which accounts for the ductility demand ratio, is known as the strength reduction factor (SRF), and the variation of this factor with initial period of the oscillator is called an SRF spectrum. This study considers scaling of the SRF spectrum in the case of an elasto-plastic oscillator with strength and sti ness degradation characteristics. Two models are considered: one depending directly on the characterization of source and site parameters and the other depending on the normalized design spectrum characterization of the seismic hazard. The ÿrst model is the same as that proposed earlier by the second author, and is given in terms of earthquake magnitude, strong-motion duration, predominant period, geological site conditions, ductility demand ratio, and ductility supply-related parameter. The second model is a new model proposed here in terms of the normalized pseudo-spectral acceleration values (to unit peak ground acceleration), ductility demand ratio and ductility supply-related parameter. For each of these models, least-square estimates of the coe cients are obtained through regression analyses of the data for 956 recorded accelerograms in western U.S.A. Parametric studies carried out with the help of these models conÿrm the dependence of SRFs on strong-motion duration and earthquake magnitude besides predominant period and site conditions. It is also seen that degradation characteristics make a slight di erence for high ductility demands and may lead to lower values of SRFs, unless the oscillators are very exible.

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Section: Raw Datamentioning

confidence: 97%

Section: Raw Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scaling of strength reduction factors for degrading elasto-plastic oscillators

Chakraborti

Gupta

2005

Earthquake Engng Struct. Dyn.

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“…It may be noted that aftershocks occur soon after the main shock and thus it is impractical to repair the damaged structure before the occurrence of the aftershocks. Therefore, as shown by Gupta et al [1], the yield design levels may have to be raised to account for aftershocks, particularly when the arrival of energy during the main shock takes place over a shorter duration.A proper evaluation of the seismic performance of a structure during a main shock and following aftershocks would require time-history analyses by using the accelerograms corresponding to the main shock and first few aftershocks. These accelerograms should be compatible with the (design) main shock motion anticipated at the site and in keeping with the present practice of seismic hazard characterization, compatibility with the pseudo-spectral acceleration (PSA) spectrum representing such an action becomes desirable [2].…”

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confidence: 99%

Wavelet‐based simulation of spectrum‐compatible aftershock accelerograms

Das

Gupta

2008

Earthq Engng Struct Dyn

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SUMMARYIn damage-based seismic design it is desirable to account for the ability of aftershocks to cause further damage to an already damaged structure due to the main shock. Availability of recorded or simulated aftershock accelerograms is a critical component in the non-linear time-history analyses required for this purpose, and simulation of realistic accelerograms is therefore going to be the need of the profession for a long time to come. This paper attempts wavelet-based simulation of aftershock accelerograms for two scenarios. In the first scenario, recorded main shock and aftershock accelerograms are available along with the pseudo-spectral acceleration (PSA) spectrum of the anticipated main shock motion, and an accelerogram has been simulated for the anticipated aftershock motion such that it incorporates temporal features of the recorded aftershock accelerogram. In the second scenario, a recorded main shock accelerogram is available along with the PSA spectrum of the anticipated main shock motion and PSA spectrum and strong motion duration of the anticipated aftershock motion. Here, the accelerogram for the anticipated aftershock motion has been simulated assuming that temporal features of the main shock accelerogram are replicated in the aftershock accelerograms at the same site. The proposed algorithms have been illustrated with the help of the main shock and aftershock accelerograms recorded for the 1999 Chi-Chi earthquake. It has been shown that the proposed algorithm for the second scenario leads to useful results even when the main shock and aftershock accelerograms do not share the same temporal features, as long as strong motion duration of the anticipated aftershock motion is properly estimated.

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“…In the literature, there are a number of damage indices that use criteria such as ductility (Banon 1981;Park 1987;Gupta 2001), inflexibility (Lybas 1977), and dissipated energy (Meyer 1988), including the number of cycle loadings (Sadeghi 1993).…”

Section: Introductionmentioning

confidence: 99%

Global RC Structural Damage Index Based on the Assessment of Local Material Damage

Amziane

Dubé

2008

ACT

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This study presents a computational method to estimate a global damage index of a RC construction. The method is based on the evaluation of local damage combined with an analysis of the probable collapse mechanism of the structure. A constitutive model for reinforced concrete, including global damage variables for concrete and steel elasto-plastic models, is integrated in a multilayered finite element code. The locations of pseudo plastic hinges in a structure are obtained in the areas of maximal damage through simulation by the FE method. The global index is derived from a specific formula taking into account the damage recorded in the critical zones of the structure (pseudo plastic hinges) and the damage computed in the less damaged areas. The proposed method is validated on a RC frame structure application. The diagram "global index vs. loading" shows a specific shape and gives interesting results for the discussion of the possibility of reparation.

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A preliminary prediction of seismic damage‐based degradation in RC structures

Cited by 22 publications

References 9 publications

Scaling of strength reduction factors for degrading elasto-plastic oscillators

Scaling of strength reduction factors for degrading elasto-plastic oscillators

Wavelet‐based simulation of spectrum‐compatible aftershock accelerograms

Global RC Structural Damage Index Based on the Assessment of Local Material Damage

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