An updated probabilistic seismic hazard assessment (PSHA) for Pakistan

Rahman, Asad ur; Najam, Fawad Ahmed; Zaman, Saeed; Rasheed, Atif; Rana, Irfan Ahmad

doi:10.1007/s10518-021-01054-8

Cited by 14 publications

(6 citation statements)

References 65 publications

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“…In the literature concerning Pakistan there are good number of studies on seismic hazard analysis. Among these, Rahman et al (2021) is the most recent. Rahman et al (2021) is based on hybrid approach consisting of spatial smoothen approach and the classical approach and it predicts high hazard value PGA in range of 0.0-0.70g.…”

Section: Introductionmentioning

confidence: 99%

“…(1)Sesetyan et al (2018) (2)Rahman et al (2021) (3) BCP (2007) and (4)Pakistan Meteorological Department and Norwegian Seismic Arrary, 2007 (PMD andNORSAR, 2007).Sesetyan et al (2018) reports PGA values for 475 and 2475 years return periods. Rahman et al (2021) produced peak ground parameters for 475 and 2475 years return periods for PGA and SA's at 0.1 and 0.2 seconds.…”

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confidence: 99%

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Updated probabilistic seismic hazard assessment of Pakistan

Waseem,

Farooq,

Ali

et al. 2023

Nat Hazards

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Probabilistic seismic hazard assessment of Pakistan is carried out to compute hazard in terms of peak ground acceleration (PGA) and spectral acceleration (SA) for 975 and 2475 years return periods. A composite earthquake catalogue consisting of 32,700 events has been compiled having a magnitude range of Mw 4.0-8.2 in this study and used in the analysis to make computations at a rectangular grid of 5 km in the OpenQuake plateform. Ground motion values have been obtained for flat rock reference seismic site conditions with shear wave velocity of 760 m/s. The epistemic uncertainties inherent in ground motion prediction equations and maximum magnitude potential of seismic sources are taken into account through logic tree. Ground motion prediction equations are assigned equal weights in the logic tree while different various weight are assigned to the maximum magnitude potential models. Results of the study are expressed as ground motion contour maps, mean uniform hazard spectra for important cities in Pakistan.PGA ranges from 0.16 to 0.54g for 10 % of probability of exceedance, 0.23 to 0.72g of probability of exceedance 0.32 to 1.02 g for 2 % of probability of exceedance in 50 years. Spectral acceleration at 0.2 s range from 0.67 to 2.19g for 2% chance of exceedance in 50 years, respectively. While spectral acceleration at 1.0 s values range from 0.09 to 0.52g 2% chance of exceedance in 50 years. Comparison of results of this study with other well regarded references of suggest that results of the study are rational and are reliable.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Updated probabilistic seismic hazard assessment of Pakistan

Waseem,

Farooq,

Ali

et al. 2023

Nat Hazards

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“…Ug is obtained directly from the PEER ground motion database and matched to the MCE (Maximum Considered Earthquake) level at Islamabad, validated by the match response spectrum of 3 GMs shown in Figure 3. Three free field ground motions are selected from the PEER ground motion database using input parameters for Islamabad as recommended by Zaman et al [34]. The input parameters included Earthquake magnitude from 6.3-7.8, source to site distance (Rrup) between 10 to 50 km, fault type categorized as either Strike-slip or reverse, and shear wave velocity (VS30)…”

Section: Ground Motion Selection and Modificationmentioning

confidence: 99%

Enhancing Fluid Viscous Damper Design in High-Rise Buildings through Direct Soil Structure Interaction Approach

Hamza,

Hammad,

Khokhar

et al. 2024

Preprint

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The application of fluid viscous dampers (FVDs) in high-rise buildings is increasing rapidly, driven by their effectiveness during seismic excitations. However, conventional design using fixed base or indirect soil structure interaction (SSI) approaches often leads to unrealistic results due to underestimated seismic demands. This study proposes a novel approach for the optimum design of FVDs incorporating direct SSI modeling for high-rise buildings. For this purpose, a 40-story case study building is selected along with the existing underlying soil. A detailed nonlinear finite element model (FEM) was developed for the superstructure and the underlying subgrade using direct SSI approach. For comparative study, two FVDs based models were developed: one designed based on seismic demands from a fixed base model, and the other utilizing the seismic demands from the direct SSI approach. These inelastic computer models were subjected to nonlinear time history analysis, employing three deconvoluted ground motions, to compare their seismic performance. The results show that the design of FVDs considering direct SSI approach can help lower the story drifts and displacements by up to 36% and increase energy dissipation by dampers by up to 10% compared to the conventional approach. The results emphasize the critical significance of adopting direct SSI modeling for achieving the optimal design of FVDs for the resilience of high-rise building structures.

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“…These ground motions are selected from PEER database. The input parameter for the selection of the ground motion is specified in [85]. The parameters for the selection of ground motion are magnitude (6.3-7.8), Rrup values 10-50 km, fault type (strip slip and reverse), and Vs30 (480-620).…”

Section: Selection Of Ground Motionsmentioning

confidence: 99%

Enhancing Seismic Resilience of Existing Reinforced Concrete Building Using Non-Linear Viscous Dampers: A Comparative Study

et al. 2023

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After the catastrophic destruction of the October 2005 Kashmir earthquake, the first building code of Pakistan was developed in 2007. The sole purpose of the building code of Pakistan (BCP) was to incorporate advancements in earthquake-resistant design to fortify structures and ensure the safety of citizens against future seismic events. After 2007, the BCP was not revised till 2021 to include the changes over time. However, the recently updated version of BCP 2021 highlights that the seismicity of many regions in Pakistan is high, which is not truly reflected in the BCP 2007. Therefore, the advancements in earthquake-resistant design due to the growing concerns about the potential risks of seismicity in the region have been incorporated into the updated version of the BCP. However, there are concerns among researchers that many structures designed on the 2007 code may need seismic fortification. Therefore, the current study focuses on the seismic fortification of existing systems that were developed using previous codes. Non-linear viscous fluid dampers are used to improve the seismic resilience of existing structures. This study compares the seismic performance of an existing reinforced concrete building with and without non-linear viscous dampers and subjected to a non-linear dynamic analysis. The performance of the building is evaluated in terms of story displacement, story drift, story acceleration, and energy dissipation mechanisms. Adding the non-linear fluid viscous dampers in the structure caused a decrease in the inter-story drift by around 31.16% and the roof displacement was reduced by around 36.58%. In addition to that, in a controlled structure, more than 70% of energy was dissipated by the fluid viscous dampers. These results indicate that adding the non-linear fluid viscous dampers to the existing structure significantly improved the vibration performance of the system against undesirous vibrations. The outcomes of this study also provide a very detailed insight into the usage of non-linear viscous dampers for improving the seismic performance of existing buildings and can be used to develop effective strategies to mitigate the impact of seismic events on already built structures.

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An updated probabilistic seismic hazard assessment (PSHA) for Pakistan

Cited by 14 publications

References 65 publications

Updated probabilistic seismic hazard assessment of Pakistan

Updated probabilistic seismic hazard assessment of Pakistan

Enhancing Fluid Viscous Damper Design in High-Rise Buildings through Direct Soil Structure Interaction Approach

Enhancing Seismic Resilience of Existing Reinforced Concrete Building Using Non-Linear Viscous Dampers: A Comparative Study

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