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- Title
Efecto de la variabilidad de la rigidez del sitio de fundación en el desempeño sísmico.
- Authors
Benedetti, Franco; Zúñiga, Fernando; Opazo, Alexander
- Abstract
In most of the structural design codes, the foundation sites are classified through the mean stiffness of the soil profile, obtained on the basis of the mean shear wave velocity of the upper 30 m Vs30. Because it is an averaged index, the site classification does not directly take into account the properties of shallower soil layers, neither the fact that sites with different soil stiffness distribution are classified as the same site class. Moreover, the way in how this situation can affect the response of the structures is not clearly specified. In this work, the effect of the site stiffness distribution on the seismic performance and level of damage of structures is explored by means of numerical models. Under a direct approach, two-dimensional numerical models are developed on OpenSees, where the structure has a nonlinear elastoplastic constitutive law. The soil is represented by nonlinear elements sensitive to confinement pressure. The soil-foundation interface is modeled with contact elements allowing the sliding and rocking of the foundation. Different structures (with periods between 0.3 to 1.2 s) are subjected to dynamic analyses using seismic records of different frequency content and amplitudes. The results show significant differences on the structural response among sites of the same class, but with different stiffness distribution, particularly when the structure remains on the elastic range, suggesting that the classification of foundation sites through an average index can underestimate the effects of the dynamic coupling of the soil, the foundation and the structure.
- Subjects
SOIL profiles; FRICTION velocity; SHEAR waves; STRUCTURAL design; TWO-dimensional models; SOIL dynamics
- Publication
Obras y Proyectos, 2017, Issue 22, p31
- ISSN
0718-2805
- Publication type
Article
- DOI
10.4067/s0718-28132017000200031