Empirical equations for the prediction of PGA and pseudo spectral accelerations using Iranian strong-motion data

Zafarani, Hamid; Luzi, Lucia; Lanzano, Giovanni; Soghrat, M. R.

doi:10.1007/s10950-017-9704-y

Cited by 55 publications

(14 citation statements)

References 48 publications

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“…More recently, Farajpour et al (2020) concluded that the NGA-West GMPEs of BSA14 and ASK14 perform better for Iran. This study also showed that, among the local GMPEs, those proposed by Darzi et al (2019) and Farajpour et al (2019) t well with the recorded data at the short periods, e.g., between PGA and Sa(0.2s), while for longer periods the models of Zafarani et al (2018), Sedaghati and Pezeshk (2017) and Ketal15 (Kale et al 2015) are preferable.…”

Section: Ground Motion Prediction Equationssupporting

confidence: 77%

Site specific probabilistic seismic hazard model for Isfahan, Iran: estimates and uncertainties

Kohrangi

Safaei

Danciu

et al. 2022

Bull Earthquake Eng

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We present a seismic source characterization model for the probabilistic seismic hazard assessment (PSHA) of the Isfahan urban area, Iran. We compiled the required datasets including the earthquake catalogue and the geological and seismotectonic structure and faults systems within the study region to delineate and characterize seismic source models. We identi ed seven relatively large zones that bound each region with similar seismotectonic characteristics and catalogue completeness periods. These regions were used for calculating the b-value of the Gutenberg-Richter magnitude recurrence relationship and for estimating the maximum magnitude value within each region. The recurrence parameters were then used to build a spatially varying distributed seismic source model using a smoothed kernel. Additionally, based on a fault database developed in this study and on a local expert's opinion about their slip velocity, an active faults based model is also created. We further performed sets of sensitivity analyses to nd stable estimates of the ground motion intensity and to de ne alternative branches for both the seismogenic source and ground motion prediction models. Site ampli cation is considered based on a Vs 30 map for

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Section: Ground Motion Prediction Equationssupporting

confidence: 77%

Site specific probabilistic seismic hazard model for Isfahan, Iran: estimates and uncertainties

Kohrangi

Safaei

Danciu

et al. 2022

Bull Earthquake Eng

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“…For these reasons, the most commonly used approach is to generate the vertical spectrum by making use of empirical models for VH ratios. [17][18][19][20][21][22][23][24][25][26] This approach, although simplified, is effective for seismic design purposes because it avoids performing vector-valued PSHA 27 including both horizontal and vertical components and the full treatment of their correlation.…”

Section: Introductionmentioning

confidence: 99%

An empirical model for the vertical‐to‐horizontal spectral ratios for Italy

Ramadan

Smerzini

Lanzano

et al. 2021

Earthq Engng Struct Dyn

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This work presents a novel empirical Ground Motion prediction Model (GMM) for vertical-to-horizontal (VH) response spectral amplitudes up to 10 s, peak ground acceleration and velocity for shallow crustal earthquakes in Italy. Being calibrated on the most up-to-date strong motion dataset for Italian crustal earthquakes (ITA18), the model is consistent with the ITA18 GMM for the horizontal ground motion. This property makes the model useful in probabilistic seismic hazard assessment for Italy to derive compatible vertical and horizontal response spectra. To account for the increase of VH ratios in the proximity of the seismic source, an adjustment term is introduced to improve the prediction capability of the model in near-source conditions, relying on the worldwide NEar-Source Strong motion dataset (NESS). The proposed model uses a simple functional form restricted to a limited number of predictor variables, namely, magnitude, source-to-site distance, focal mechanism, and site effects, and the variability associated with both VH and V models is provided.

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“…The pseudo-spectral accelerations (PSAs) are also needed in computing the general building's collapse fragility functions. The PSAs can be directly estimated by given GMPEs (Boore et al 2014;Zafarani et al 2017). However, here, they are indirectly computed as PSA = B.PGA (BHRC 2014), where B is the shape of the design response spectrum.…”

Section: P a G E |mentioning

confidence: 99%

Risk-adjusted Design Basis Earthquake’s Adequacy for use in Seismic Design Codes

Zaman

Ghayamghamian

2021

Preprint

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In most buildings’ seismic design codes design basis peak ground acceleration (PGADBE) is provided by employing a uniform-hazard approach. However, a new trend in updating seismic codes is to adopt a risk-informed method to estimate the PGADBE so-called risk-adjusted design basis peak ground acceleration (PGARDBE). An attempt is made here to examine the adequacy of the PGARDBE to fulfill the assumptions made in seismic codes for converting the maximum considered earthquake’s (MCE) intensity to PGADBE. To this end, the performance of regular intermediate steel moment frames (IMF) is assessed in terms of collapse margin (CMR) and residual drift ratios in the event of MCE and design basis earthquake (DBE), respectively. The PGARDBEs are computed for Karaj County, Iran. A set of 96 index archetypes of regular IMF are designed considering four design parameters, which include the number of stories (2, 3, 6, 9, 12, and 15), span lengths (4 and 8 meters), occupancies (residential and commercial), and seismic demands (0.15, 0.25, 0.35 and 0.45g). The PGADBE prescribed by Standard No. 2800 for Karaj neither meets the assumed acceptance criteria nor stands on the safe side. Meanwhile, PGARDBE fulfills the acceptance criteria but does not necessarily satisfy the implicit assumption made in codes that the code-conforming buildings have at least a CMR of 1.5 if the MCE occurs. This emphasizes that the PGARDBE should not be used without examining the CMR fulfillment. The results recommend that a lower limit need to be set on PGARDBEs, which is found to be 0.35g for Karaj. Outcomes also reveal that the code-conforming buildings designed with the proposed PGARDBE can fulfill both repairability and life safety performances at the DBE and MCE, respectively. These buildings also have a high chance to be even considered as repairable ones at the seismic demand of MCE. Furthermore, regardless of the employed method for estimating PGADBE, various relationships between design parameters with different performance indicators such as CMR, residual drift ratio, ductility demand, imposed drift ratio, and building’s normalized weight are presented. These relationships can be used to evaluate the buildings’ safety factor against collapse and repairability, justification of using IMF in regions with high seismicity, level of structural and nonstructural damage as well as the economic consequence of changes in PGADBE. The presented relationships provide a multi-criteria decision-making tool to decide on the optimum PGADBE leading to an affordable alternative and tolerable damage.

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Empirical equations for the prediction of PGA and pseudo spectral accelerations using Iranian strong-motion data

Cited by 55 publications

References 48 publications

Site specific probabilistic seismic hazard model for Isfahan, Iran: estimates and uncertainties

Site specific probabilistic seismic hazard model for Isfahan, Iran: estimates and uncertainties

An empirical model for the vertical‐to‐horizontal spectral ratios for Italy

Risk-adjusted Design Basis Earthquake’s Adequacy for use in Seismic Design Codes

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