Location
San Diego, California
Presentation Date
29 Mar 2001, 11:15 am - 12:00 pm
Abstract
The paper presents a critical assessment of the currently prevailing view of structural engineers, as expressed in seismic codes, that the role of SSI is always beneficial for the design seismic forces developing in a structure. Using recorded strong ground motions and theoretical analyses it is shown that, in certain seismic and soil environments, an increase due to SSI in the fundamental period of a moderately flexible structure may have a detrimental effect on seismic demand, contrary to the conclusion drawn on the basis of idealized (“average”) code spectra. Using a simple 2-dof system and a number of actual ground motions as excitation, it is also shown that indiscriminate use of presently popular “geometric” ductility relations may lead to erroneous conclusions in the prediction of seismic performance of flexibly-supported structures. A significant case history, referring to the failure of the 630-m Fukae bridge section of the Hanshin Expressway Route 3 in Kobe (1995), further supports the main findings of the paper, by showing that soil-structure interaction may have played a decisive even if subtle role in that failure.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2001 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Gazetas, George and Mylonakis, George, "Soil-Structure Interaction Effects on Elastic and Inelastic Structures" (2001). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 2.
https://scholarsmine.mst.edu/icrageesd/04icrageesd/session13/2
Included in
Soil-Structure Interaction Effects on Elastic and Inelastic Structures
San Diego, California
The paper presents a critical assessment of the currently prevailing view of structural engineers, as expressed in seismic codes, that the role of SSI is always beneficial for the design seismic forces developing in a structure. Using recorded strong ground motions and theoretical analyses it is shown that, in certain seismic and soil environments, an increase due to SSI in the fundamental period of a moderately flexible structure may have a detrimental effect on seismic demand, contrary to the conclusion drawn on the basis of idealized (“average”) code spectra. Using a simple 2-dof system and a number of actual ground motions as excitation, it is also shown that indiscriminate use of presently popular “geometric” ductility relations may lead to erroneous conclusions in the prediction of seismic performance of flexibly-supported structures. A significant case history, referring to the failure of the 630-m Fukae bridge section of the Hanshin Expressway Route 3 in Kobe (1995), further supports the main findings of the paper, by showing that soil-structure interaction may have played a decisive even if subtle role in that failure.
