Probabilistic Seismic Hazard Assessment for Iraq

Onur, Tuna; Gök, R.; Abdulnaby, Wathiq; Shakir, Ammar M.; Mahdi, Hanan; Numan, Nazar M. S.; Al‐Shukri, Haydar; Chlaib, Hussein Khalefa; Ameen, Taher H.; Abd, Najah A.

doi:10.2172/1305883

Cited by 12 publications

(13 citation statements)

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“…The statistical analysis for Iraq seismicity reveals that 90.05% of events have magnitudes within the range (4-5.4), while 6.03% of the total events have magnitudes within the range (5.5-7.4). The contour map of the peak ground acceleration, according to the PSHA study introduced by Onur et al [19], is shown in Figure 9. In the South of Iraq, the PGA map shows that its value increases from 0.1g to more than 0.5g as the site varies towards the Iraq-Iran borderline.…”

Section: Selection Of Acceleration Time-historiesmentioning

confidence: 99%

Seismic Performance of Clay Bricks Construction

Kadhim

Dawood

2020

Civ Eng J

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The extensive use of masonry construction accompanied by the seismic hazard in Iraq requires comprehensive studies to assess the seismic performance of such construction. This study aims to evaluate the seismic performance of URM and CM buildings by their nonlinear time-history responses. ANSYS 18.2 software has been used to perform the nonlinear dynamic analyses. The mechanical properties have been investigated as the first step of the study. A simple mechanical instrument was improvised to determine the tensile strength of masonry directly. Ground motions were chosen in a manner so that their peak ground accelerations and site soils are as similar as possible to those in the South of Iraq. The computer software terminated all the analyses before the ends of the applied earthquake duration because of the solutions did not converge. In the numerical models, severe cracks have been observed in both URM and CM models, indicating their unsafe seismic performance. The minor cracks in confining concrete in the CM model compared to the severe ones in the masonry walls of the same model show the capability of the confinement to prevent the disintegration of collapsed masonry walls, at least in damaging cases like the building state at the solution termination.

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Section: Selection Of Acceleration Time-historiesmentioning

confidence: 99%

Seismic Performance of Clay Bricks Construction

Kadhim

Dawood

2020

Civ Eng J

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“…The earthquakes data prepared for this study covers an area outlined by longitudes (36º.00 -51º.00) E and latitudes (26º.00 -40º.00) N, which is the same area used by Onur et al (2016), and their outlines are about 300 km distance to nearest boundary of Iraq [2]. Four main sources used in compiling these data, the first one is the Iraqi earthquakes data file from the report of the seismic design code of Iraq (1988), that includes more than 600 earthquakes for the time period 859 -1986, and they are in terms of Mb, ML, Ms.…”

Section: Collecting and Processing Datamentioning

confidence: 99%

“…Figure 1.a shows the counterclockwise rotational motion and northeast trending transitional motion of the Arabian plate. Most of the earthquakes are occurring in the crust along the Taurus and Zagros mountain ranges and their foothills [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The activity parameters a and b were evaluated for each of these sources using the developed catalogue whereas mmax values have been calculated using the geometry of known faults inside each source. Also, contour maps of PGA and spectral accelerations at 1.0 and 0.2 seconds have been plotted for a return period of 2475 years [2]. For the seismic sources in the active shallow crustal region, they used four attenuation relationships given by Boore et al (2014), Chiou and Youngs (2014) and Campbell and Bozorgnia (2014) in conjunction with Poisson distribution in the PSHA to plot these maps, but they based on dependent data events.…”

Section: Introductionmentioning

confidence: 99%

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Updated Probabilistic Seismic Hazard Assessment for Iraq/2018

Farman

Said

2018

CivileJournal

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Recently, Iraq has experienced an unprecedented seismic activity, specifically, near the east boundary with Iran which reveals the need to re-evaluate the seismic hazard at this region. This study consists of two phases. The first is collecting the earthquake records covering the recent events till the end of November 2017 including the 12 November 2017 (7.3Mw) earthquake, and applying data processing to get the net data for independent events for the study area which were more than 4300 of net main earthquakes of Mw ≥ 4 and were used in the second phase. The second phase is applying the PSHA method by dividing the study area into a grid of small cells of size 0.5 0.5°and the hazard parameters were calculated at the center of each of these grid cells then, converting the final results to contours over the study area. It is found that the values increases towards the east-northeast and north due to the continued tectonic boundary convergence between the Arabian, Iranian and Turkish plates which produces intense earthquake activity. The design spectral acceleration at 0.2 and 1.0 seconds found to be 0.33, 0.17, 0.47, 0.25, 0.71, 0.35 g for Basra, Baghdad and Erbil, respectively. The comparison between the PGA values from this study and from the seismic hazards maps from Iraqi seismic codes of 1989, 1997 and 2016, for return periods of 475 and 2475 years, reveals the continued increase with time which reveals the need to updating the seismic hazard maps continuously.

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“…The first Iraqi seismic code [1] was published in 1997 but it was neither include a probabilistic seismic hazard assessment for Iraq [2,3] nor mandated in the building industry, therefore most of the buildings in south of Iraq were designed without considering seismic forces. Recent seismological studies in Iraq showed that the eastern border of Iraq is a seismically active zone and represent part of the convergent plate between the Arabian, Anatolian and Iranian plates [4,5] .…”

Section: Introductionmentioning

confidence: 99%

Seismic Analysis of Reinforced Concrete Buildings in South of Iraq based on Different Codes

Al-Jassim¹,

Raheem²

2018

IJET

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Buildings in south of Iraq were designed for gravity loads only. Recent studies showed that the Badra-Amarah fault at the Iraq-Iran boarder is an active fault and could suffer a major damage. Hence seismic evaluation of existing buildings is getting more importance. The objective of this paper is to assess the seismic performance of two reinforced concrete buildings with six floors each, one has a shear wall and the other has not. The concentrated plasticity with nonlinear time history is adopted for the analysis. The spectrum matching method is used to scale three time-acceleration records to the expected seismic level in the region. Three different codes are used for the analysis, the International building code-2012, the Uniform building code-1997 and the Iraqi seismic code-2017. Comparison of results showed that IBC-2012 gave the most conservative results in displacements, number and performance of plastic hinges and base shear. The Iraqi code gave the least values within 60% for the base shear and 18-50% for drifts. As a conclusion, the analyzed buildings are a little beyond the elastic level according to the Iraqi code, beyond the immediate occupancy level according to the UBC-1997 and near the collapse prevention level according to IBC-2012.

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Probabilistic Seismic Hazard Assessment for Iraq

Cited by 12 publications

References 0 publications

Seismic Performance of Clay Bricks Construction

Seismic Performance of Clay Bricks Construction

Updated Probabilistic Seismic Hazard Assessment for Iraq/2018

Seismic Analysis of Reinforced Concrete Buildings in South of Iraq based on Different Codes

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