Seismic soil-structure interaction analysis of tall slender structures
01 Oct 2008-International Journal of Geotechnical Engineering (Taylor & Francis)-Vol. 2, Iss: 4, pp 381-393
TL;DR: In this paper, a seismic soil-structure interaction (SSI) analysis of a ventilation stack located in a nuclear power plant site was carried out by the flexible volume substructure method using computer program SASSI 2000.
Abstract: The seismic response of soil-structure system depends on the characteristics of the input motion, site conditions and structure itself. In a seismic soil-structure interaction analysis, it is necessary to consider the infinite extent and layered nature of the soil, and the nonlinear behaviour of soils. This paper presents the seismic soil-structure interaction (SSI) analysis of a ventilation stack located in a nuclear power plant site. The SSI analysis was carried out by the flexible volume substructure method using computer program SASSI 2000. The influence of various parameters such as relative stiffness of the layers of the site, thickness of soil layer and foundation embedment on the interaction behaviour of the stack is investigated. The nonlinear soil behaviour is modelled by using site-specific modulus reduction and damping ratio curves developed from the laboratory experiments. It is found that the seismic response at the various levels of the stack shows a strong dependence on the relati...
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110 citations
01 Jun 2021
TL;DR: In this article, a simple analytical model was developed to evaluate soil-pile-structure interaction effects on the alluvium with non-constant shear modulus in depth.
Abstract: This study developed a simple analytical model to evaluate soil-pile-structure interaction effects on the alluvium with non-constant shear modulus in depth. Numerical analysis was performed to verify the accuracy of the proposed analytical model. A good agreement between analytical and the numerical results evidenced the accuracy of the proposed analytical model. Two systems were compared analytically: case A—single degree-of-freedom (SDOF) system located on a pile in a soil layer with constant shear modulus in depth; case B—SDOF system located on a pile in a soil layer with a non-constant shear modulus in depth. The results showed that for case B, soil-structure interaction effects on structures located on soil alluvium with a non-constant shear modulus in depth were more significant, similar to those of the SDOF system located on softer soil. In case B, the shear modulus of soil near the surface of the layer was lower than the depth soil, and the degree of freedom at the pile head was more flexible (rocking DOF), which increased the vibration period of the system at least 8%. Hence, dynamic behaviors of tall and heavy structures significantly affected the alluvium with non-constant shear modulus in depth. The assessment of soil-structure interaction is a local issue and for dynamic analysis one should use the shear modulus around the foundation, not the mean value of 30-m depth of soil alluvium.
4 citations
TL;DR: In this article, the kinematic and inertial interactions, two mechanisms of soil-foundation-structure interaction (SFSI), were investigated on uniform and layered grounds, and it was found that roof motion (RM) of the tall structure increased in layered profile even though the free-field motion (FFM) decreased compared to homogeneous ground.
Abstract: It is essential to reduce structural damages caused by earthquakes in severe conditions, such as layered ground, especially when a soft soil layer is close to the surface. In this study, the kinematic and inertial interactions, two mechanisms of soil–foundation–structure interaction (SFSI), of different soil–foundation–structure systems (SFS) were investigated on uniform and layered grounds. Two layered soil profiles composed of a low stiffness layer laid over another were prepared in an equivalent shear beam container. Nine centrifuge experiments were carried out for three structures located on the surface of each ground and exposed to the Hachinohe earthquake while increasing the peak acceleration of the input motion. Numerical simulations were performed to simulate the centrifuge tests. It was found that roof motion (RM) of the tall structure increased in layered profile even though the free-field motion (FFM) decreased compared to homogeneous ground. The appearance of a soft layer beneath structures modifies the SFS system’s stiffness that causes kinematic and inertial interactions to alter to those on uniform soil profile.
2 citations
TL;DR: In this paper , the authors investigated the impact of soil-pile-structure interaction (SPSI) on the seismic response of a 100 m tall tower on a deep soil deposit.
1 citations
TL;DR: In this paper, a 10-storey RC frame building is assumed to be situated on type-II soil and located in seismic zone V of India, and the building is designed using the response spectrum analysis method of the Indian seismic code.
Abstract: Recently, the conditional mean spectrum (CMS) has become an important tool in ground-motion selection for seismic evaluation of structures. In the present numerical study, a 10-storey RC frame building is assumed to be situated on type-II soil and located in seismic zone V of India. The building is designed using the response spectrum analysis method of the Indian seismic code. Further, it is analysed using the nonlinear time history analysis method for three different CMS ground motions. The numerical study is performed for three cases: (1) fixed base with actual earthquake record; (2) fixed base with site-specific earthquake record considering soil amplification; and (3) flexible base considering soil–foundation flexibility and soil amplification. The results of the analysis are compared for the above-mentioned cases in terms of lateral displacement and storey drifts. It is observed that the displacement profile of the structure subjected to all the three considered ground motions is not the same, although they are matching to CMS. It is concluded that out of the two important soil effects, i.e. soil amplification and soil–foundation flexibility, soil amplification has a significant effect on the seismic response; however, the nature of response depends mainly on the ground-motion characteristics.
1 citations
References
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TL;DR: In this paper, a numerical method for the dynamic analysis of infinite continuous systems is developed, applicable to systems for which all exciting forces and geometrical irregularities are confined to a limited region and is applicable to both transient and steady state problems.
Abstract: A numerical method for the dynamic analysis of infinite continuous systems is developed. The method is applicable to systems for which all exciting forces and geometrical irregularities are confined to a limited region and is applicable to both transient and steady state problems. The infinite system is replaced by a system consisting of a finite region subjected to a boundary condition which simulates an energy absorbing boundary. The resulting systems may be analyzed by the finite element method. Examples applying the method to foundation vibration problems are presented. Good agreement with existing solutions is found and new results for embedded footings are presented.
2,172 citations
01 Jan 1972
1,529 citations
Book•
01 Jan 1985
Abstract: Keywords: Interaction-sol-structure Reference Record created on 2004-09-07, modified on 2016-08-08
932 citations
TL;DR: In this article, a discussion of the effects of soil-structure interaction on the dynamic response of linear structures which respond as single-degree-of-freedom systems in their fixed-base condition is presented.
Abstract: A discussion of the effects of soil-structure interaction on the dynamic response of linear structures which respond as single-degree-of-freedom systems in their fixed-base condition is presented. The structures are presumed to be supported at the surface of a homogeneous, elastic halfspace and to be excited at the base. The free-field ground motions investigated include a harmonic motion, a relatively simple pulse-type excitation and an actual earthquake record. Comprehensive response spectra are presented for a range of the parameters defining the problem, and the results are used to assess the accuracy of a simple, approximate method of analysis in which the system is represented by a viscously damped, simple oscillator. Special attention is given to defining the conditions under which the interaction effect is of sufficient importance to warrant consideration in design. The method of analysis used to obtain the numerical data reported herein is reviewed only briefly, the emphasis of the paper being on the interpretation of the results.
510 citations
"Seismic soil-structure interaction ..." refers background in this paper
...The increase in natural period is a result of the flexibility of the soil, whereas the increase in damping results from the loss of energy in the soil by radiation and material damping (Veletsos and Meek 1974)....
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Book•
10 Oct 1996
TL;DR: In this article, the authors propose a similarity-based method for UNIT-IMPULSE RESPONSE and DYNAMIC STIFFNESS, based on similarity-based simulation.
Abstract: Partial table of contents: SIMILARITY-BASED FORMULATION FOR UNIT-IMPULSE RESPONSE AND DYNAMIC STIFFNESS. Displacement, Velocity and Acceleration Unit-Impulse Response with Dynamic Stiffness and Rational Approximation. Forecasting Method. Consistent Infinitesimal Finite-Element Cell Method Applied to Bounded Medium. DAMPING-SOLVENT EXTRACTION FOR DYNAMIC STIFFNESS AND INTERACTION FORCE. Fundamentals of Damping-Solvent Extraction Method. DOUBLY-ASYMPTOTIC MULTI-DIRECTIONAL TRANSMITTING BOUNDARY. Concept and Numerical Implementation of Doubly-Asymptotic Multi-Directional Transmitting Boundary. Accuracy and Modelling Procedure of Doubly-Asymptotic Multi-Directional Transmitting Boundary. Appendices. References. Index.
315 citations