Evaluation of Site Factors for Seismic Bridge Design in New York City Area

Nikolaou, Sissy; Mylonakis, George; Edinger, Peter

doi:10.1061/(asce)1084-0702(2001)6:6(564)

Cited by 11 publications

(15 citation statements)

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“…The unit weight versus depth profile of NYC site is adopted from the work of Nikolaou et al (2001). For sites of WTX, SC, and ME, the geology-based soil index properties (Table 3) proposed by Harmon et al (2019a) are assigned, which are conditioned on their location and geologic classification from Kottke et al (2012).…”

Section: Selected Sites For Site Response Analysesmentioning

confidence: 99%

“…Figure3. V S profiles of selected sites as Alpine, WTX (Andrews, SC,Sasanaul and Gassman, 2019;Li et al (2020);ME Hashash et al (2001, 2008 and NYC,Nikolaou et al, 2001) to the depth of (a) 1200 m and (b) 100 m.The first three (a-o) rows show the data for three motions from the work ofNikolaou et al (2001). The last three rows exhibit the information forHarmon et al's (2019a) motions with PGA of 0.30g (d, j, and p), 0.5g (e, k, and r), and 1.46g (f, l, and s), respectively.…”

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confidence: 99%

“…Figure 4. Acceleration time histories, response, and Fourier amplitude spectra of six motions used for 1D site-specific response analyses.The first three (a-o) rows show the data for three motions from the work ofNikolaou et al (2001). The last three rows exhibit the information forHarmon et al's (2019a) motions with PGA of 0.30g (d, j, and p), 0.5g (e, k, and r), and 1.46g (f, l, and s), respectively.…”

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confidence: 99%

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Application of empirical and simulation-based site amplification models for Central and Eastern North America to selected sites

et al. 2021

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The Next Generation Attenuation Relationships for Central & Eastern North-America (NGA-East) Geotechnical Working Group (GWG) has presented models for site amplification in Central and Eastern North America that represent a significant change from past practice, which was based on models developed for active tectonic regions. The GWG models are ergodic in their formulation, meaning that they produce an average level of amplification conditional on VS30 and other the site parameters. We illustrate the application of these models to four sites in Texas, South Carolina, Mississippi, and New York City, and compare results with site-specific ground response analyses. The results indicate that substantial advantage is possible when ergodic models conditioned only on VS30 are supplemented with a modular term that produces a peak at one or more site natural periods ( Tnat). The article demonstrates features and limitations of the GWG models for sites in Central and Eastern North America and provides useful recommendations for coupling ergodic and non-ergodic (site-specific) modeling as part of seismic hazard studies.

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Section: Selected Sites For Site Response Analysesmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Application of empirical and simulation-based site amplification models for Central and Eastern North America to selected sites

et al. 2021

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“…It should be noted that the bedrock condition is different from that of CENA. For New York City area, the shear wave velocities of the bedrock range from 2 to 3 km/s, as reported in Nikolaou et al (2001). V S for the reference rock condition of CENA was set to 3000 m/s (Hashash et al, 2014) in the study of HEA19.…”

Section: Introductionmentioning

confidence: 99%

Simulation-based site amplification model for shallow bedrock sites in Korea

et al. 2021

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A new simulation-based site amplification model for shallow sites with thickness less than 30 m in Korea is developed. The site amplification model consists of linear and nonlinear components that are developed from one-dimensional linear and nonlinear site response analyses. A suite of measured shear wave velocity profiles is used to develop corresponding randomized profiles. A VS30 scaled linear amplification model and a model dependent on both VS30 and site period are developed. The proposed linear models compare well with the amplification equations developed for the western United States (WUS) at short periods but show a distinct curved bump between 0.1 and 0.5 s that corresponds to the range of site natural periods of shallow sites. The response at periods longer than 0.5 s is demonstrated to be lower than those of the WUS models. The functional form widely used in both WUS and central and eastern North America (CENA), for the nonlinear component of the site amplification model, is employed in this study. The slope of the proposed nonlinear component with respect to the input motion intensity is demonstrated to be higher than those of both the WUS and CENA models, particularly for soft sites with VS30 < 300 m/s and at periods shorter than 0.2 s. The nonlinear component deviates from the models for generic sites even at low ground motion intensities. The comparisons highlight the uniqueness of the amplification characteristics of shallow sites that a generic site amplification model is unable to capture.

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“…However, the effect of geological setting characterized by depth and properties of the bedrock as well as variation in the index properties of soil are currently not included. A number of investigators had taken note of the discrepancy related to the geological setting for particular areas [5][6][7][8][9][10][11][12][13]. Few studies also attempted to analyze the sensitivity of site amplification factors to variability in soil index properties [14,15].…”

Section: Introductionmentioning

confidence: 99%

A study on sensitivity of seismic site amplification factors to site conditions for bridges

Chaudhary

2018

BNZSEE

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Seismic site amplification factors and seismic design spectra for bridges are influenced by site conditions that include geotechnical properties of soil strata as well as the geological setting. All modern seismic design codes recognize this fact and assign design spectral shapes based on site conditions or specify a 2-parameter model with site amplification factors as a function of site class, seismic intensity and vibration period (short and long). Design codes made a number of assumptions related to the site conditions while specifying the values of short (Fa) and long period (Fv) site amplification factors. Making these assumptions was necessary due to vast variation in site properties and limited availability of actual strong motion records on all site conditions and seismic setting in a region. This paper conducted a sensitivity analysis for site amplification factors for site classes C and D in the AASHTO bridge design code by performing a 1-D site response analysis in which values of site parameters like strata depth, travel-time averaged shear wave velocity in the top 30 m strata (Vs30), plasticity index (PI), impedance contrast ratio (ICR) and intensity of seismic ground motion were varied. The results were analyzed to identify the site parameters that impacted Fa and Fv values for site classes C and D. The computed Fa and Fv values were compared with the corresponding values in the AASHTO bridge design code and it was found that the code-based Fa and Fv values were generally underestimated and overestimated respectively.

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Evaluation of Site Factors for Seismic Bridge Design in New York City Area

Cited by 11 publications

References 8 publications

Application of empirical and simulation-based site amplification models for Central and Eastern North America to selected sites

Application of empirical and simulation-based site amplification models for Central and Eastern North America to selected sites

Simulation-based site amplification model for shallow bedrock sites in Korea

A study on sensitivity of seismic site amplification factors to site conditions for bridges

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