An Efficient Method for Considering the Directionality Effect of Earthquakes on Structures

Pinzón, Luis A.; Alvarado, Sergio Alberto Díaz; Pujades, L. G.; Vargas, Yeudy F.

doi:10.1080/13632469.2019.1597783

Cited by 19 publications

(24 citation statements)

References 27 publications

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“…One interesting topic regarding the seismic hazard and the damage assessment is the one related to directionality effects. Directionality-related issues have been investigated in two areas: (i) in seismic hazard studies and (ii) in the expected structural performance [4][5][6][7]. The first one focuses on the influence of the sensor's orientation on the ground motion records of an earthquake.…”

Section: Introductionmentioning

confidence: 99%

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

et al. 2021

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In this work, the directionality effects during the MW 7.8 earthquake, which occurred in Muisne (Ecuador) on 16 April 2016, were analyzed under two perspectives. The first one deals with the influence of these effects on seismic intensity measures (IMs), while the second refers to the assessment of the expected damage of a specific building located in Manta city, Ecuador, as a function of its azimuthal orientation. The records of strong motion in 21 accelerometric stations were used to analyze directionality in seismic actions. At the closest station to the epicenter (RRup = 20 km), the peak ground acceleration was 1380 cm/s2 (EW component of the APED station). A detailed study of the response spectra ratifies the importance of directionality and confirms the need to consider these effects in seismic hazard studies. Differences between IMs values that consider the directionality and those obtained from the as-recorded accelerograms are significant and they agree with studies carried out in other regions. Concerning the variation of the expected damage with respect to the building orientation, a reinforced concrete building, which was seriously affected by the earthquake, was taken as a case study. For this analysis, the accelerograms recorded at a nearby station and detailed structural documentation were used. The ETABS software was used for the structural analysis. Modal and pushover analyses were performed, obtaining capacity curves and capacity spectra in the two main axes of the building. Two advanced methods for damage assessment were used to obtain fragility and mean damage state curves. The performance points were obtained through the linear equivalent approximation. This allows estimation and analysis of the expected mean damage state and the probability of complete damage as functions of the building orientation. Results show that the actual probability of complete damage is close to 60%. This fact is mainly due to the greater severity of the seismic action in one of the two main axes of the building. The results are in accordance with the damage produced by the earthquake in the building and confirm the need to consider the directionality effects in damage and seismic risk assessments.

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Section: Introductionmentioning

confidence: 99%

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

et al. 2021

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“…damping value was used as a target. The spectral matching method used in this paper was developed by Pujades (personal communication, 2015) and has been used in previous studies [39,40]. A comparison showing the effectiveness of the matching procedure can be seen in Fig.…”

Section: Ground Motion Recordsmentioning

confidence: 99%

A drift-correlated ground motion intensity measure: Application to steel frame buildings

Pinzón

Alzate

Pujades

et al. 2020

Soil Dynamics and Earthquake Engineering

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Estimations of seismic risk in urban areas should include quantifications of the expected damage to civil structures subjected to earthquakes. In buildings, this quantification depends on the maximum inter-story drift (MIDR), among other aspects. In this study, the correlation between several intensity measures (IMs) and the maximum inter-story drift of steel structures was investigated. Three steel frame buildings of 3, 7 and 13 stories were used as a testbed. These buildings were modelled as 2D framed structures. For the seismic hazard, forty strong ground motion pairs were selected (80 individual horizontal components) from the Italian database. These records were scaled to a specific peak ground acceleration (PGA) and matched to a design spectrum from Eurocode 8. Nonlinear dynamic analysis was used to estimate the seismic response of the structures. Thus, 720 nonlinear dynamic analyses (NLDA) were performed [3 structures × (80 as recorded accelerograms + 80 scaled records + 80 matched records)]. Preliminary results indicate that PGA and MIDR show the worst correlation. A higher correlation was observed for peak ground velocity, root-mean-square velocity and specific energy density intensity-based measures. Finally, a new IM, which is highly correlated with MIDR, is proposed. This IM is called ID-PGV and considers both the PGV and the significant duration.

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“…Over the past two decades, directionality effects have received considerable attention. Research has been performed to assess these effects on recorded ground motions [4,5], intensity measures and their influences on the development of ground motion prediction equations [6][7][8][9], seismic demands of buildings [10][11][12][13][14][15][16], probabilistic damage assessment [17], directivity effects in nearfault regions [18][19][20], horizontal-to-vertical spectral ratios [21][22][23], seismic risk assessment of highways [24], and the performance of bridge foundations [25].…”

Section: Introductionmentioning

confidence: 99%

“…As shown in [10,11,16], directionality effects can be addressed in time-history-based dynamic analyses by using a number of linear combinations of the two horizontal as-recorded components as input motions. In this way, peak response parameters can be determined as functions of the rotation angle.…”

Section: Introductionmentioning

confidence: 99%

“…However, dynamic analyses are generally computationally expensive, especially when nonlinear behaviour is considered. For this reason, some simplified approaches have been developed to incorporate directionality effects without the need of performing a large number of analyses [11,26]. For instance, a spectral matching technique was employed by Pinzón et al [11] to derive input motions accounting for directionality.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic soil-structure interaction analyses considering directionality effects

Pinzón

Mánica

Pujades

et al. 2020

Soil Dynamics and Earthquake Engineering

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An Efficient Method for Considering the Directionality Effect of Earthquakes on Structures

Cited by 19 publications

References 27 publications

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

Case Study of a Heavily Damaged Building during the 2016 MW 7.8 Ecuador Earthquake: Directionality Effects in Seismic Actions and Damage Assessment

A drift-correlated ground motion intensity measure: Application to steel frame buildings

Dynamic soil-structure interaction analyses considering directionality effects

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