Earthquake Ground-Motion Simulation including Nonlinear Soil Effects under Idealized Conditions with Application to Two Case Studies

Taborda, Ricardo; Bielak, Jacobo; Restrepo, Doriam

doi:10.1785/0220120079

Cited by 44 publications

(31 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been addressed in the recent years only by a few studies (Krishnan et al 2006;Taborda et al 2012;Isbiliroglu et al 2013), due to the related intrinsic complexities of reproducing such phenomena in a single conforming model. A sketch of potential applications of SPEED is illustrated in Fig.…”

Section: Development Of the Numerical Codementioning

confidence: 99%

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Paolucci

Mazzieri

Smerzini

et al. 2014

Geotechnical, Geological and Earthquake Engineering

View full text Add to dashboard Cite

With the ongoing progress of computing power made available not only by large supercomputer facilities but also by relatively common workstations and desktops, physics-based source-to-site 3D numerical simulations of seismic ground motion will likely become the leading and most reliable tool to construct ground shaking scenarios from future earthquakes. This paper aims at providing an overview of recent progress on this subject, by taking advantage of the experience gained during a recent research contract between Politecnico di Milano, Italy, and Munich RE, Germany, with the objective to construct ground shaking scenarios from hypothetical earthquakes in large urban areas worldwide. Within this contract, the SPEED computer code was developed, based on a spectral element formulation enhanced by the Discontinuous Galerkin approach to treat non-conforming meshes. After illustrating the SPEED code, different case studies are overviewed, while the construction of shaking scenarios in the Po river Plain, Italy, is considered in more detail. Referring, in fact, to this case study, the comparison with strong motion records allows one to derive some interesting considerations on the pros and on the present limitations of such approach.

show abstract

Section: Development Of the Numerical Codementioning

confidence: 99%

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Paolucci

Mazzieri

Smerzini

et al. 2014

Geotechnical, Geological and Earthquake Engineering

View full text Add to dashboard Cite

show abstract

“…One‐dimensional nonlinear soil models are often preferred because they are better than other approximate approaches such as the linear equivalent method and because—in most cases—their parameters can be easily related to laboratory test (eg, shear moduli degradation curves and evolution of damping with level of deformation). However, it is well known that three‐dimensional effects due to geometric or input motion complexities play a significant role in the mechanical performance of geomaterials (eg, Xu et al and Taborda et al). Therefore, adequate models that can simulate nonlinear soil behavior under multiaxial, arbitrary (cyclic) loading conditions are necessary.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial cyclic plasticity in accordance with 1D hyperbolic models and Masing criteria

Restrepo

Taborda

2018

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Summary Bounding surface plasticity models based on one‐dimensional hardening functions are broadly accepted as a valid approach to represent the multiaxial cyclic behavior of undrained cohesive soils. However, under certain conditions, these models may exhibit deviations from the expected stress path. This makes them inadequate to meet traditional hysteretic rules. Current solutions to this problem impose thresholds to help adjust the stress path by introducing additional memory variables. This article presents a formulation that achieves the same goal without the need of such additional variables. The proposed formulation operates on a generic hardening function under multiaxial loading while preserving the simplicity inherited from pure deviatoric bounding surface models. In addition, the approach presented here allows the implementation of Masing‐type rules, as well as the use of reduction factors to mitigate the overdamping effects of large hysteresis loops. The formulation is tested using well‐known hyperbolic backbone functions under radial and nonradial multiaxial loading cycles, and it is shown to have good agreement with reference solutions.

show abstract

“…However, realistic topography was frequently not considered in simulations because of the difficulty of incorporating the free surface boundary condition in the FDM in the presence of topography (Moczo et al, 2007). Since the 1990s, the finite element method (FEM) (Liu et al, 1991;Bao et al, 1998;Ma et al, 2007;Taborda et al, 2012) has been applied to the study of wave propagation in realistic models, including 3D sedimentary basins. However, large systems require iterative routines, which may increase the cost of the calculations, particularly in the case of realistic 3D problems.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Modeling of Seismic Wave Propagation in Wudu Basin

Zhang¹,

Zhou

et al. 2017

Proceedings of the 2017 2nd International Conference on Modelling, Simulation and Applied Mathematics (MSAM2017)

View full text Add to dashboard Cite

Abstract-The Mw 7.9 earthquake occurred in Wenchuan, Sichuan, China, on 12 May 2008, and it caused huge casualties, economic loss, and serious damage to engineering structures and infrastructures in the area near the fault rupture. In particular, the Wudu township far away from the fault rupture (>100km), which is located in a sedimentary basin, also suffered serious damage, and was in the area with seismic intensity VIII-IX in the Isoseismal Map of Wenchuan Earthquake. In this study, full elastic wave field simulations in the Wudu Basin were conducted by using a three-dimensional (3D) finite element method based on the parallel computing cluster platform of the ABAQUS software. The 3D Wudu Basin model is constructed based on the the digital terrain data borehole spatial distribution data in regional geological survey. The basin model consists of Four major subsurfaces and the basin basement, All calculations were executed in the time domain, and the soil and rock were assumed to be linearly elastic. The viscous spring artificial boundary was adopted as the artificial condition, and the oblique incidenct wave was transformed into the equivalent nodal forces acting on the viscous spring artificial boundary of the finite model. In the simulation, an impulse with a duration of 0.25 s was taken as the input SV wave. The simulating results of seismic response characteristics varying greatly from different points in the Wudu Basin revealed the basin edge effect, and the basin-focusing effect. The surface wave generated after the primary S wave is trapped at the shallow part of the basin, and most of the energy is reflected from the interfaces of soil strata and focused back into the basin when the wave propagates through the deepest part of the basin. Moreover, a part of the seismic wave front turns and follows the shallow basin edge, resulting in further amplification. The phenomenon, the incident angle of the seismic waves can produce unusually strong shaking distribution, was demonstrated. It indicates that the complex Wudu Basin geometry, the fairly low velocity of the surface soil layer, and the incident angle of seismic waves dominate the amplification and wave propagation behavior, which results in extraordinary strong shaking patterns in the Wudu basin area.

show abstract

Earthquake Ground-Motion Simulation including Nonlinear Soil Effects under Idealized Conditions with Application to Two Case Studies

Cited by 44 publications

References 53 publications

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Multiaxial cyclic plasticity in accordance with 1D hyperbolic models and Masing criteria

Three-Dimensional Numerical Modeling of Seismic Wave Propagation in Wudu Basin

Contact Info

Product

Resources

About