New Approach for Selection of Real Input Ground Motion Records for Incremental Dynamic Analysis (IDA)

Kiani, Jalal; Khanmohammadi, Mohammadreza

doi:10.1080/13632469.2014.997901

Cited by 41 publications

(15 citation statements)

References 38 publications

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“…As the IDA and the MSA both use the scaled GMs, the legitimacy of amplitude scaling of GMs over multiple IM levels is the main concern regarding these methods. 19,32 In contrast, the cloud analysis involves subjecting the structure to a set of as-recorded GMs without scaling them up and down. Hence, there is no concern regarding the bias in the structural responses because of GM scaling.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the assumptions of normal distribution of the residuals, which is well accepted in the field of earthquake engineering, Inelastic spectral displacement S di is the maximum displacement demand of a single degree of freedom system. 19 The responses of the single degree of freedom system are calculated using the smooth hysteretic model, a generic model developed by Sivaselvan and Reinhorn 20 using the characteristics of RC members.…”

Section: Methodsmentioning

confidence: 99%

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Sensitivity analysis of the seismic demands of RC moment resisting frames to different aspects of ground motions

Kiani

Pezeshk

2017

Earthq Engng Struct Dyn

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Summary A weight vector representing the relative importance of various characteristics of ground motions (GMs) and a conditioning intensity measure (IM) are required to be able to use the generalized conditional IM framework for the purpose of GM selection. An inappropriate weight vector may result in the biased distributions of some important characteristics of GMs and, consequently, the bias in the structural responses. This article aims to provide the analyst with the understanding of which properties of GMs are important in capturing the accurate structural responses, to specifically assign a suitable weight to them and to select an appropriate conditioning IM as well. To this end, 4 reinforced concrete buildings, located at the site in which the seismic hazard is dominated by shallow crustal earthquakes, are considered. The findings reveal that the appropriate weight vectors depend on the characteristics of the employed structural systems. In addition, the role played by each IM in capturing the true structural responses changes over different earthquake intensity levels implying that different weight vectors are required over different earthquake levels. Furthermore, this study shows that, even in case of shorter‐duration GMs from shallow events, GM duration should be incorporated in GM selection as it has effects on the peak‐based structural responses in the earthquake levels beyond the level of 2%‐in‐50‐years. Specifically, the findings reveal that in case of shallow events, unlike large magnitude earthquakes, the shorter the duration of GM the more rapid release of energy and, consequently, the larger the peak‐based structural responses.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Sensitivity analysis of the seismic demands of RC moment resisting frames to different aspects of ground motions

Kiani

Pezeshk

2017

Earthq Engng Struct Dyn

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“…Some researchers have mentioned that using a fixed suite of ground motion records for performing IDAs is not appropriate . In this regard, adaptive IDA has been proposed by Lin and Baker that changes ground motion records at different IM levels to account for the variation of ground motion characteristics corresponding to different hazard levels.…”

Section: Structural Models and Fragility Functionsmentioning

confidence: 99%

“…Pseudo acceleration response spectra of the records given PGA = 1.0 g. PGA: peak ground acceleration Some researchers have mentioned that using a fixed suite of ground motion records for performing IDAs is not appropriate. [42,43] In this regard, adaptive IDA has been proposed by Lin and Baker [42] that changes ground motion records at different IM levels to account for the variation of ground motion characteristics corresponding to different hazard levels. However, the main concern regarding this method is that it requires a large number of ground motion records.…”

Section: Figurementioning

confidence: 99%

Reliable fragility functions for seismic collapse assessment of reinforced concrete special moment resisting frame structures under near‐fault ground motions

Yakhchalian

2019

Structural Design Tall Build

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Summary A collapse fragility function shows how the probability of collapse of a structure increases with increasing ground motion intensity measure (IM). To have a more reliable fragility function, an IM should be applied that is efficient and sufficient with respect to ground motion parameters such as magnitude (M) and source‐to‐site distance (R). Typically, pulse‐like near‐fault ground motions are known by the presence of a velocity pulse, and the period of this pulse (Tp) affects the structural response. The present study investigates the application of different scalar and vector‐valued IMs to obtain reliable seismic collapse fragility functions for reinforced concrete special moment resisting frames (RC SMRFs) under near‐fault ground motions. The efficiency and sufficiency of the IMs as the desirable features of an optimal IM are investigated, and it is shown that seismic collapse assessments by using most of the IMs are biased with respect to Tp. The results show that (Sa(T1), Sa(T1)/DSI) has high efficiency and sufficiency with respect to M, R, Tp, and scale factor for collapse capacity prediction of RC SMRFs. Moreover, the multiobjective particle swarm optimization algorithm is applied to improve the efficiency and sufficiency of some advanced scalar IMs, and an optimal scalar IM is proposed.

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“…This form of disaggregation is commonly available from organisations that provide seismic hazard information, such as the United States Geological Survey (USGS) [6] or the Italian National Institute of Geophysics and Volcanology (INGV) [7]. Perhaps due to its ready availability this form of disaggregation is often used directly as an aid in ground-motion selection in PBEE [8,9,10]. However, this is not consistent with the typical seismic analysis that follows, which is used to determine the response of a structure at a given intensity (i.e.…”

Section: Background and Options For Seismic Hazard Disaggregationmentioning

confidence: 99%

Seismic hazard disaggregation in performance‐based earthquake engineering: occurrence or exceedance?

Fox

Stafford

Sullivan

2015

Earthq Engng Struct Dyn

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SUMMARYSeismic hazard disaggregation is commonly used as an aid in ground-motion selection for the seismic response analysis of structures. This short communication investigates two different approaches to disaggregation related to the exceedance and occurrence of a particular intensity. The impact the different approaches might have on a subsequent structural analysis at a given intensity is explored through the calculation of conditional spectra. It is found that the exceedance approach results in conditional spectra that will be conservative when used as targets for ground-motion selection. It is however argued that the use of the occurrence disaggregation is more consistent with the objectives of seismic response analyses in the context of Performance-Based Earthquake Engineering.

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New Approach for Selection of Real Input Ground Motion Records for Incremental Dynamic Analysis (IDA)

Cited by 41 publications

References 38 publications

Sensitivity analysis of the seismic demands of RC moment resisting frames to different aspects of ground motions

Sensitivity analysis of the seismic demands of RC moment resisting frames to different aspects of ground motions

Reliable fragility functions for seismic collapse assessment of reinforced concrete special moment resisting frame structures under near‐fault ground motions

Seismic hazard disaggregation in performance‐based earthquake engineering: occurrence or exceedance?

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