NEHRP Clearinghouse
- Title
- Soil Structure Interaction in Different Seismic Environments.
- File
- PB80101520.pdf
- Author(s)
- Gomez-Masso, A.; Lysmer, J.; Chen, J. C.; Seed, H. B.
- Source
- National Science Foundation, Washington, DC., August 1979, 57 p.
- Identifying Number(s)
- UCB/EERC-79/18
- Abstract
- The current strong interest in nuclear power and the concerns regarding the seismic safety of the facilities involved has generated the development of improved methods of seismic soil-structure interaction analysis. Presented is a plane-strain method for soil-structure interaction analysis consisting of the superposition of the free field motions and the interaction motions, in a generalized seismic environment. The free field is modeled as a horizontally layered viscoelastic medium and the seismic environment may consist of a combination of S, P and Rayleigh waves. The soil-structure system is modeled with viscoelastic finite elements, transmitting boundaries viscous boundaries, and a 3-dimensional simulation. Comparative analyses of the same structure are conducted for an input of R waves and for vertically propagating S and P waves in a rock site and sand site. In the rock site the R waves produce higher peak horizontal spectral acceleration up to 25% and a significant rocking effect at points away from the center of gravity of the structure. However, the S and P waves show a higher peak vertical spectral acceleration by up to 15% at the center of the structure. Very similar horizontal response, but higher vertical response only at the center of the structure for S and P waves, are obtained for the sand site.
- Keywords
- Seismic waves; Dynamic response; Finite element analysis; Earthquake engineering; Secondary waves; Nuclear power plants; Primary waves; Soil dynamics; Rayleigh waves; Soil structure interactions; Earthquakes