Site response in a representative region of Manzanillo, Colima, Mexico, and a comparison between spectra from real records and spectra from normative

Domínguez, R Tonatiuh; Rodríguez‐Lozoya, Héctor E.; Sandoval, Mario Cabrera; Sanchez, Eva Sanchez; Meléndez, Armando Aguilar; Leyva, Héctor E. Rodríguez; Campos, R. Amelia

doi:10.1016/j.soildyn.2016.11.013

Cited by 6 publications

(1 citation statement)

References 7 publications

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“…Given a LogNormal distribution, the range of Vs values in the first 30 m is defined as 240 to 365 m/s. In addition, Vs profiles presented by Tonatiuh Dominguez et al [10] for the region of Manzanillo in similar geological conditions were considered. Figure 4b depicts the Vs profile developed based on the Vs30 estimation, the S1 and S3 profiles corresponding to Manzanillo, and the idealized profile considering all three profiles; as can be seen, the variation was small.…”

Section: Regional Geology and Vs30 Estimationmentioning

confidence: 99%

Damping Assessment of Bridges for Performance Base Design

Mayoral,

Pérez

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Modern performance bridge design relies on reaching controlled stages of damage and failure modes to ensure both safety and economy. In high seismic zones, the design philosophy should be based on the ability of a bridge to deform inelastically and ductilely, allowing some damage to fused elements to decrease the potential internal forces during earthquakes. This approach, however, requires a careful determination of the potential damping expected to occur on the structure and foundation. In the case of single-span or two-span bridges, the abutments have a significant impact on the bridge's performance, mainly in the longitudinal vibration modes, so the determination of the damping in the abutment is critical. In most reference bridge design manuals, the recommended damping values for abutments usually range from 5% to 10%, which results in a more robust design of the structure due to the limited allowance of energy dissipation. In particular, this paper presents a numerical study of the energy dissipation available in the abutments of common bridge typologies. The observed damage patterns in bridges near the epicentral zone induced by recent subduction earthquakes in Mexico were analyzed using 3D finite difference models. To simulate the development of damping in the abutment, a fully nonlinear approach was adopted, where the hysteretic model Sig3 coupled with the Mohr-Couomb constitutive model was considered for the mechanical and dynamic behaviour. From the results gathered in here, the relationship between damping and abutment displacements was established, and it is clearly demonstrated that the inclusion of large damping values during bridge design can lead to both cost-efficient and safe designs if a good abutment deformation assessment is conducted.

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Section: Regional Geology and Vs30 Estimationmentioning

confidence: 99%

Damping Assessment of Bridges for Performance Base Design

Mayoral,

Pérez

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Two-sensor microtremor SPAC method: potential utility of imaginary spectrum components

Cho

2019

Geophysical Journal International

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Summary We build a model of discretization errors, known as directional aliasing, to theoretically evaluate how biases in the microtremor spatial autocorrelation (SPAC) coefficient, or the real part of the SPAC spectrum of microtremor analysis, are related to the magnitudes of the imaginary part when a seismic array of only two sensors is used. By using this model, we investigate the potential utility of the imaginary spectrum component as an indicator of applicability of the two-sensor SPAC method to the field of microtremors generated at an observation site. Field data of microtremors from compact seismic arrays (1–15 m) are used to test the model. It is found that, when the imaginary components are very large in magnitude (where the threshold depends on the rk, the array radius times the wavenumber), the field of microtremors is dominated by waves arriving from a single direction parallel to the array axis and the SPAC coefficients tend to be underestimated in small rk ranges (i.e. rk < 3.8; the range considered throughout this study). In the present study, which is based on the observations of 400 microtremor arrays, the underestimates seldom exceeded 30 per cent. The SPAC coefficient estimates could be corrected in that case by using information on the imaginary part. When the imaginary components are very modest in magnitude, by contrast, there are two possible scenarios: either (i) the waves are arriving predominantly from a single direction perpendicular to the array axis and the SPAC coefficients are wildly overestimated (i.e. there was a small percentage of low-quality data, with relative errors exceeding +50 per cent, based on the observed data analyses), or (ii) the wavefield is close to isotropic and the SPAC coefficients are unbiased (i.e. 70–90 per cent of all observed data fell within the relative error range of ±20 per cent). It is difficult in that case to have SPAC coefficient estimates corrected by using information on the imaginary part alone.

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Seismic response analysis for Romanian extra-carpathian sedimentary areas

Marmureanu

Cioflan

Apostol

2021

TER

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The seismic response of the ground motion is analysed using processed recordings and related spectral characteristics. The analysis is carried out for few representative different sites, with different geological local conditions. Data used are recordings from the last strongest seismic events (1986, August 30, Mw = 7.1, 1990, May 30, Mw = 6.9 and 1990, May 31, Mw=6.4). The approach used herein to assess the particular features of the seismic effects could open a new perspective in microzoning and risk studies. In the context of Vrancea-intermediate depth seismicity, whose effects are encountered at long epicentral distances, the choice of these sites is fully justified. Therefore the paper intends to focus on the particularities in the site effects that occur due to the sedimentary deposits’ oscillation under strong seismic ground motion for different areas. The spectral amplification factors are introduced in order to have a quantitative representation with respect to the variability of site effects.

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Site response in a representative region of Manzanillo, Colima, Mexico, and a comparison between spectra from real records and spectra from normative

Cited by 6 publications

References 7 publications

Damping Assessment of Bridges for Performance Base Design

Damping Assessment of Bridges for Performance Base Design

Two-sensor microtremor SPAC method: potential utility of imaginary spectrum components

Seismic response analysis for Romanian extra-carpathian sedimentary areas

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