Soil structure interaction effects on structural parameters for stiffness degrading systems built on soft soil sites

2013 ◽  
Vol 45 (5) ◽  
pp. 655-676 ◽  
Author(s):  
Muberra Eser Aydemir
Keyword(s):  
Soil Structure ◽  
Structural Parameters ◽  
Soft Soil ◽  
Interaction Effects ◽  
Soil Structure Interaction ◽  
Structure Interaction

scholarly journals Seismic analysis of a highway bridge considering soil-structure interaction effects

1979 ◽  
Vol 12 (4) ◽  
pp. 305-313
Author(s):  
Toshio Iwasaki ◽  
Kazuhiko Kawashima
Keyword(s):  
Seismic Response ◽  
Natural Frequency ◽  
Soil Structure ◽  
Soft Soil ◽  
Ground Surface ◽  
Highway Bridges ◽  
Interaction Effects ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Fundamental Natural Frequency

In analyzing seismic behaviour of highway bridges constructed on soft soil deposits, it is important to take account of soil-structure interaction effects. In this paper, seismic response of a bridge pier-foundation is investigated based on earthquake acceleration records measured simultaneously on the pier crest and on the ground surface near that bridge. Four motions were used in the analysis, i.e., two were induced by two earthquakes with magnitudes of 7.5 and 6.6, respectively; and two by their aftershocks. In the former two earthquakes, the maximum accelerations were 186 and 438 gals on the ground surface, and 310 and 230 gals on the pier top, respectively. Analyses of frequency characteristics of the motions showed that the predominant frequencies of pier-foundation were always approximately identical with the fundamental natural frequency of the subsoil. Analyses of micro-tremors measured at the sites revealed that the natural frequency of the pier-foundation system is higher than the fundamental natural frequency of the subsoil. Analytical models were formulated to calculate the seismic response of the pier-foundation assuming the subsoil and pier-foundation to be a shear column model with an equivalent linear shear modulus and an elastically supported beam on the subsoil, respectively. Bedrock motions were computed from the measured ground surface motions and then applied to the bedrock of the analytical model. The seismic responses of pier-foundation were thus calculated and compared with the measured records giving a good agreement.

Monitoring of a rehabilitated building in soft soil in Mexico and structural response to September 2017 earthquakes: Part 2: Numerical simulation

2020 ◽  
Vol 36 (2_suppl) ◽  
pp. 238-261
Author(s):  
David Murià-Vila ◽  
Oriol Arnau Delgado ◽  
Guillermo G Aguilar Silva ◽  
Damaris Arias Lara ◽  
Karen Pérez-Liévana
Keyword(s):  
Numerical Simulation ◽  
Soil Structure ◽  
Numerical Models ◽  
Soft Soil ◽  
Computational Cost ◽  
Interaction Effects ◽  
Soil Structure Interaction ◽  
Elastic Model ◽  
Actual Behavior ◽  
Structure Interaction

This article deals with the proper numerical simulation of the response presented by an instrumented damaged-retrofitted building using a low computational cost linear-elastic model, using effective stiffness for its reinforced concrete structural members. The purpose is to identify the most appropriate criteria and considerations and to validate them against the actual behavior of the building registered during real earthquakes. Relevant structural aspects like concrete elastic modulus and soil–structure interaction effects are determined experimentally. Special attention is paid to select appropriate techniques to model the complex geometry of the North-South facades wall elements and their related coupling beams. Finally, time-history analyses of 20 March 2012 earthquake (service conditions demand) and 19 September 2017 earthquake (design conditions demand) are performed, both considering and ignoring the soil–structure interaction effects. Results point out that commonly adopted simplifications in numerical models of buildings must be correctly implemented to satisfactorily simulate their earthquake response.

scholarly journals Centrifuge testing of soil–structure interaction effects on cyclic failure potential of fine-grained soil

2021 ◽  
pp. 875529302098197
Author(s):  
Jason M Buenker ◽  
Scott J Brandenberg ◽  
Jonathan P Stewart
Keyword(s):  
Soil Structure ◽  
Interaction Effects ◽  
Soil Structure Interaction ◽  
Centrifuge Testing ◽  
Geotechnical Centrifuge ◽  
Structure Interaction ◽  
Fine Grained ◽  
Stiffness Properties ◽  
Fine Grained Soil ◽  
Strip Footings

We describe two experiments performed on a 9-m-radius geotechnical centrifuge to evaluate dynamic soil–structure interaction effects on the cyclic failure potential of fine-grained soil. Each experiment incorporated three different structures with a range of mass and stiffness properties. Structures were founded on strip footings embedded in a thin layer of sand overlying lightly overconsolidated low-plasticity fine-grained soil. Shaking was applied to the base of the model container, consisting of scaled versions of recorded earthquake ground motions, sweep motions, and step waves. Data recorded during testing were processed and published on the platform DesignSafe. We describe the model configuration, sensor information, shaking events, and data processing procedures and present selected processed data to illustrate key model responses and to provide a benchmark for data use.

Vertical soil-structure interaction effects

1979 ◽  
Vol 69 (1) ◽  
pp. 221-236
Author(s):  
R. R. Little ◽  
D. D. Raftopoulos
Keyword(s):  
Nuclear Power ◽  
Soil Structure ◽  
Power Plants ◽  
Structural Model ◽  
Free Field ◽  
Interaction Effects ◽  
Soil Structure Interaction ◽  
Response Curves ◽  
Transformation Techniques ◽  
Structure Interaction

abstract An analytical expression describing the three-dimensional vertical soil-structure interaction effects is developed using Laplace and Hankel transformation techniques. Utilizing these transformation techniques and normal mode theory of vibration, an N-mass structural model is coupled to an elastic half-space representing the earth. The resulting interaction equation is solved by numerical iteration techniques for a model of a nuclear power plant subjected to actual earthquake ground excitation. The effects of the soil-structure interaction are evaluated by comparing free-field acceleration spectrum response curves with similar curves determined from the foundation motion. These effects are found to be significant for structures typical of modern nuclear power plants subjected to seismic ground motions.

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