A vector‐valued intensity measure for near‐fault ground motions

Zengin, Esra; Abrahamson, Norman A.

doi:10.1002/eqe.3261

Cited by 36 publications

(27 citation statements)

References 39 publications

(74 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It can be seen that the maximum IP occurs at around 10 seconds, which corresponds to the steepest slope of the CSV. The previous findings showed that the IP has a significant influence on the structural response after eliminating the effects of spectral shape and amplitude of the ground motions [2][3][4].…”

Section: Instantaneous Powermentioning

confidence: 99%

“…For instance, characterization of the near-fault ground motions including velocity pulses requires the determination of the probability of the presence of a pulse, the period of the pulse, as well as the amplitude of the pulse. The recent study showed that the vector IM consisting of Sa(T 1 ) and Instantaneous Power (IP(T 1 )) sufficiently and efficiently captures the destructive impact of the near-fault ground motions on structural response [2]. In order to capture the damaging characteristics of these motions, it is necessary to consider the combined effects of relevant IMs, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Use of Instantaneous Power for Near-Fault Record Modification

Zengin¹,

Abrahamson²

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

The current seismic design and assessment procedures describe the seismic demand in terms of elastic spectral accelerations, which may not be adequate to capture the destructive effects of near-fault ground motions. The relevant characteristics of near-fault records, such as the presence of a velocity pulse, the pulse amplitude, and the pulse period (T p ), make the record selection and modification task more challenging. A newly proposed intensity measure, called Instantaneous Power (IP(T 1 )), takes into account the effects of velocity pulses on structural response. It has been shown that vector IM including IP(T 1 ) and elastic spectral acceleration at the first mode period of structure Sa(T 1 ) results in more reliable and accurate structural responses compared to the traditional IM, Sa(T 1 ). A new matching method is developed to incorporate the effects of IP into the record modification process. The procedure combines a widely used time-domain spectral matching algorithm, RspMatch, and a velocity adjustment approach to simultaneously match the target response spectrum and IP spectrum. We investigate the extent to which controlling the IP parameter in the modification process affects the nonlinear structural response by comparing the results of single-degree-of-freedom (SDOF) systems and multi-degree-of-freedom (MDOF) system, under the sets of Sa-only matched and Sa-and IP-matched records. Our findings show that the consideration of IP in the record matching can help prevent potential bias in structural response.

show abstract

Section: Instantaneous Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Use of Instantaneous Power for Near-Fault Record Modification

Zengin¹,

Abrahamson²

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is analogous to the concept of vector-valued IMs (Baker, 2007). Several researchers have applied this sophistication to develop enhanced IMs (IM*), which consist in a vector of IVs providing more efficient estimates of EDPs (Modica and Stafford, 2014;Yakhchalian et al, 2015;Bojórquez et al 2015;Ge and Zhou, 2018;Zengin and Abrahamson, 2020;Yakhchalian et al, 2021). The amount of efficiency that can be gained by an IM depends on the correlation value between the residuals of the IM-EDP cloud and SP.…”

Section: Sufficiencymentioning

confidence: 99%

New Insights Into the Relationship Between Seismic Intensity Measures and Nonlinear Structural Response

Alzate

Hurtado

Pujades

2021

Preprint

View full text Add to dashboard Cite

This paper focuses on the probabilistic analysis of Intensity Measures (IMs) and Engineering Demand Parameters (EDPs) for earthquake excitations. Several statistical properties, which are desirable in IMs when they are used to predict EDPs, have been analyzed. The main sources of uncertainty involved in the calculation of the seismic risk have been considered in the analysis. Efficiency, sufficiency and steadfastness have been quantified for a set of IMs with respect to two EDPs: the maximum inter-storey drift ratio, MIDR, and the maximum floor acceleration, MFA. Steadfastness is a new statistical property proposed in this article. It is related to the ability of IMs to forecast EDPs for big building suites. This also means that efficiency does not significantly vary when different types of buildings are included in the statistical analyses. This property allows reducing the number of calculations when performing seismic risk estimations at urban level since, for instance, a large variety of fragility curves of specific buildings can be grouped together within an only one, but more generic, fragility function. The nonlinear dynamic response of probabilistic multi-degree-of-freedom buildings’ models, subjected to a large data set of ground motion records, have been considered to perform the statistical analysis. Specifically, reinforced concrete buildings whose number of stories vary from 3 to 13 stories have been analysed. 18 spectrum-, energy- and direct-accelerogram-based IMs have been considered harein. From the statistical properties of the generated clouds of IM-EDP points, efficiency and sufficiency properties have been quantified. For MIDR, results show that IMs based on spectral velocity are more efficient and steadfast than the ones based on spectral acceleration; spectral velocity averaged in a range of periods, AvSv, has shown to be the most efficient and steadfast IM. The opposite happens for MFA, that is, spectral acceleration-based-IMs are more efficient than the velocity-based ones. A comparison on the use of linear vs quadratic regression models, and their implications on the derivation of fragility functions, is presented as well. Concerning sufficiency, most of the 18 basic IMs analyzed herein do not have this property. However, multi-regression models have been employed to address this lack of sufficiency allowing to obtain a so-called ‘ideal’ IM.

show abstract

“…To study the response of structure to near-fault pulses with different periods, artificial ground motions have been used. For this purpose, regarding the fact that directivity and fling pulses have a relatively deterministic nature, some researchers tried to present synthetic models for these pulsetype motions (for example, [27][28][29][30][31][32][33]). In this study, the model proposed by Mavroeidis and Papageorgiou [34] has been used to mathematically express the directivity pulse.…”

Section: Mathematical Near-fault Pulse Modelsmentioning

confidence: 99%

Stability Analysis of Rocking Soil-Structure Systems Subjected to Near-Fault Pulses

Ahmadi

Masaeli

2020

NMCE

View full text Add to dashboard Cite

The overturning potential of rocking soil-structure systems subjected to near-fault pulses is investigated in this paper. An extensive parametric study is conducted, including medium-tohigh-rise buildings with different aspect ratios based on shallow raft foundation allowed to uplift considering the effects of nonlinear soil-structure interaction. The considered parameters are (i) ground motion characteristics, (ii) structural properties of the superstructure, and (iii) foundation design parameters. Mathematical directivity and fling pulses are used as input ground motion. The superstructure is assumed to predominantly showcase first-mode characteristics. Two-dimensional overturning spectra of buildings of various geometrical, as well as dynamic characteristics, are derived. Evidently, the prevalent pulse period (Tp) is a key parameter governing the rocking response of the system. It is also observed that fling pulses are more destructive than directivity pulses of the same magnitude with respect to overturning potential. On the other hand, the lower frequency parameter (p) of the more large-size buildings is a quantity that indicates higher safety margins against toppling with respect to small-size buildings of the same aspect ratio. D D

show abstract

A vector‐valued intensity measure for near‐fault ground motions

Cited by 36 publications

References 39 publications

On the Use of Instantaneous Power for Near-Fault Record Modification

On the Use of Instantaneous Power for Near-Fault Record Modification

New Insights Into the Relationship Between Seismic Intensity Measures and Nonlinear Structural Response

Stability Analysis of Rocking Soil-Structure Systems Subjected to Near-Fault Pulses

Contact Info

Product

Resources

About