Influence of site conditions on seismic design parameters for foundations as determined via nonlinear site response analysis

Chaudhary, Muhammad Tariq A.

doi:10.1007/s11709-021-0685-0

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…However, there is no universally accepted standard for the number of rock motion records to be used for ground response analysis. Some researchers (e.g., [25][26][27][28]) used seven records for response analysis, while others (e.g., [14,29]) suggest as few as five to seven records are sufficient. The lack of thorough exploration in these areas highlights the need for further investigations.…”

Section: Introductionmentioning

confidence: 99%

Impact of Randomized Soil Properties and Rock Motion Intensities on Ground Motion

Chala,

Ray

2024

Advances in Civil Engineering

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Seismic site response is inevitably influenced by natural variability of soil properties and anticipated earthquake intensity. This study presents the influence of variability in shear wave velocity (Vs) and amplitude of input rock motion on seismic site response analysis. Monte Carlo simulations were employed to randomize the Vs profile for different scenarios. A series of 1-D equivalent linear (EQL) seismic site response analyses were conducted by combining the randomized Vs profile with different levels of rock motion intensities. The results of the analyses are presented in terms of surface spectral acceleration, amplification factors (AFs), and peak ground acceleration (PGA). The mean and standard deviation of these parameters are thoroughly discussed for a wide range of randomized Vs profile, number of Vs randomizations, and intensities of input rock motions. The results demonstrate that both the median PGA and its standard deviations across different number of Vs profile realization exhibit a slight variation. As few as twenty Vs profile realizations are sufficient to compute reliable response parameters. Both rock motion intensity and standard deviation of Vs variability cause significant variation in computed surface parameters. However, the variability in the number of records used to conduct site response has no significant impact on ground response if the records closely match the target spectrum. Incorporating the multiple sources of variabilities can reduce uncertainty when conducting ground response simulations.

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Section: Introductionmentioning

confidence: 99%

Impact of Randomized Soil Properties and Rock Motion Intensities on Ground Motion

Chala,

Ray

2024

Advances in Civil Engineering

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“…This study is therefore designed to produce (1) the map of top thick sediments from the predominant fundamental frequency distribution across the valley; (2) shear wave velocity ( V S ) distribution beneath the valley; and (3) types of horizontal-to-vertical spectral ratios (HVSRs) with its ground behavior in case of a strong earthquake occurs in the valley. These quantified maps are of paramount importance in ground response analysis (Bard et al, 1988; Hartzell et al, 2006; Kawase, 1996; Rajaure et al, 2017; Viens et al, 2022; Wirth et al, 2019; Zhu et al, 2020), soil liquefaction analysis (Andrus and Stokoe, 2000; Wood et al, 2017), numerical modeling of seismic wave propagation (Kham et al, 2006; Langston et al, 2009; Semblat et al, 2005; Wang et al, 2022, and many others), and also urban city planning and engineering design (Chaudhary, 2021; Makra et al, 2001). To accomplish this study, ambient-vibration monitoring–based single and array station data sets are generated across the valley.…”

Section: Introductionmentioning

confidence: 99%

Site response analysis beneath the Kashmir basin (NW Himalaya) using ambient noise

Gupta,

Parvez,

Khan

2023

Earthquake Spectra

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Deep sedimentary valleys entrap and amplify seismic waves, which is further responsible for site-specific amplification over the allied region. Kashmir valley is a deep and active sedimentary basin in the northwest portion of the Himalayan lap. To characterize the site response for the intermountain Kashmir valley for the first time, we acquire single station microtremor measurements using Lennartz (three components/5s seismometer) at 141 sites with a grid of (5 km × 5 km) and two-dimensional (2D) array measurements using seven units of recording station of different geometry pattern at 38 sites across different lithological setup within the basin. We present here (1) a first-order predominant fundamental frequency (0.21–10.19 Hz) and subsequent sedimentary thickness maps for the entire valley, reflecting deep deposition with spatial heterogeneity in the area using the horizontal-to-vertical spectral ratio (HVSR) technique; (2) spatial classification of generated HVSR curves linking subsurface geomorphology and post strong ground-motion scenario in the valley; (3) extraction of the best dispersion characteristics of Rayleigh waves (fundamental mode) from all recorded vertical signals at each array site using frequency–wavenumber (F-K) method with an emphasis on signal synchronicity; and (4) retrieval of one-dimensional (1D) shear wave velocity ( VS) profiles across the valley from the inversion of dispersion curves using the neighborhood algorithm. Distinct model parameterizations were tested for the inversion to achieve the optimal inversion misfit. The collocated 1D VS profiles are consistent with newly drilled borehole logs information. Besides, the presented first-ever ambient noise survey–based site response study meets the objectives of site-specific seismic hazard and risk analysis of the Kashmir valley at the regional scale.

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Relationship Between Shear Wave Velocity and Soil Depth and Evaluation of Soil Liquefaction in Quaternary Sedimentary Layer

Zhou

Li²,

Zhang³

et al. 2023

Environmental Science and Engineering

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Influence of site conditions on seismic design parameters for foundations as determined via nonlinear site response analysis

Cited by 6 publications

References 30 publications

Impact of Randomized Soil Properties and Rock Motion Intensities on Ground Motion

Impact of Randomized Soil Properties and Rock Motion Intensities on Ground Motion

Site response analysis beneath the Kashmir basin (NW Himalaya) using ambient noise

Relationship Between Shear Wave Velocity and Soil Depth and Evaluation of Soil Liquefaction in Quaternary Sedimentary Layer

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