𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Effects of random variations of soil properties on site amplification of seismic ground motions

✍ Scribed by Sheng Wang; Hong Hao

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
785 KB
Volume
22
Category
Article
ISSN
0267-7261

No coin nor oath required. For personal study only.

✦ Synopsis

This paper investigates the effects of random variations of soil properties on site amplification of seismic waves. First, based on attenuation laws and the filtered Tajimi -Kanai spectrum, seismic motion at the base rock of a soil site is stochastically generated according to an assumed earthquake with a given magnitude and epicentral distance. Motions on the surface of this layered random soil site are calculated by nonlinear wave propagation methods, and by assuming the incoming seismic wave consisting of SH wave or combined P and SV waves. Soil properties, including shear modulus, damping ratio and mass density, as well as ground water level are considered as random in the numerical calculation. The Rosenblueth method is used to solve the random dynamic responses of the soil site. Parametric calculations are performed to investigate the effects of various parameters on site amplification of seismic waves. The mean and maximum ground motions on surface of the site are estimated. Numerical results indicate that the estimated surface motions differ substantially if the random variations of soil properties and soil saturation level are taken into consideration in the analysis.

πŸ“œ SIMILAR VOLUMES

Influence of irregular topography and ra
Influence of irregular topography and random soil properties on coherency loss of spatial seismic ground motions
✍ Kaiming Bi; Hong Hao πŸ“‚ Article πŸ“… 2010 πŸ› John Wiley and Sons 🌐 English βš– 801 KB

## Abstract Coherency functions are used to describe the spatial variation of seismic ground motions at multiple supports of long span structures. Many coherency function models have been proposed based on theoretical derivation or measured spatial ground motion time histories at dense seismographi

Influence of small lateral variations of
Influence of small lateral variations of a soft surficial layer on seismic ground motion
✍ M. Campillo; F.J. SΓ‘nchez-Sesma; K. Aki πŸ“‚ Article πŸ“… 1990 πŸ› Elsevier Science 🌐 English βš– 423 KB

We investigate the effects that lateral variations in thickness of very soft surficial deposits have on seismic motions. We find that smooth geometrical irregularities can be associated with strong effects of local amplification of the surface motion and with large increase of the duration of the si

Influence of ground motion spatial varia
Influence of ground motion spatial variation, site condition and SSI on the required separation distances of bridge structures to avoid seismic pounding
✍ Kaiming Bi; Hong Hao; Nawawi Chouw πŸ“‚ Article πŸ“… 2010 πŸ› John Wiley and Sons 🌐 English βš– 556 KB

## Abstract It is commonly understood that earthquake ground excitations at multiple supports of large dimensional structures are not the same. These ground motion spatial variations may significantly influence the structural responses. Similarly, the interaction between the foundation and the surr