DIRECT APPROACH TO SEISMIC SOIL – STRUCTURE–INTERACTION ANALYSIS – BUILDING GROUP CASE

2010 ◽  
Vol 2 (1) ◽  
pp. 22-30 ◽  
Author(s):  
Abdelhacine Gouasmia
Keyword(s):  
Structural Analysis ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Soft Soil ◽  
Near Field ◽  
Soil Layer ◽  
Careful Consideration ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Response Amplification

Nowadays, the new and emerging concept of seismic structural design, the so-called performance-based design, requires careful consideration of all aspects involved in structural analysis. One of the most important aspects of structural analysis is soil-structure interaction (SSI). Such interaction may alter the dynamic characteristics of structures and consequently may be beneficial or detrimental to the performance of structures. In order to observe such effects we study the seismic response of an idealized small city composed of five equally spaced, five storey reinforced concrete buildings anchored in a soft soil layer overlaid by a rock half-space. Our results show predict response amplification of the buildings in the near field in accordance with the results observed in similar cases.

Auto-Mesh Generation Technique of Near Field Zone for Soil-Structure Interaction Analysis Using Coupled FE-IE Methodology

2013 ◽  
Vol 281 ◽  
pp. 589-592
Author(s):  
Min Jun Nam ◽  
Choon Gyo Seo ◽  
Jonghan Lee ◽  
Chang Gil Lee ◽  
Seung Hee Park
Keyword(s):  
Finite Element ◽  
Mesh Generation ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Near Field ◽  
Soil Structure Interaction ◽  
Field Zone ◽  
Infinite Element ◽  
Structure Interaction ◽  
Generation Technique

This paper presents an auto-mesh generation technique using KIESSI (KAIST Infinite Elements for Soil-Structure Interaction) of near field zone for soil-structure interaction analysis (SSI). The working principle of KIESSI is based on coupled three dimensional finite element-infinite element methodology. Also, KIESSI is based on finite element method (FEM) for structure and near-field soil medium and infinite element method for layered half-space far-field. This study utilizes the auto mesh generation technique of near field zone on KIESSI package. The verification example for the effectiveness of automatically meshing technique may be shown through a compliance analysis of layered surface footing. For application example, seismic response analysis at a typical nuclear power plant is carried out in consideration of SSI. The obtained floor response spectrum results in good agreement as compared with the measured response data and the results from SSI analysis package such as SASSI (A System for Analysis of Soil-Structure Interaction).

scholarly journals NON-LINEAR DYNAMIC SOIL‐STRUCTURE INTERACTION ANALYSIS OF BUILDINGS

2007 ◽  
Vol 13 (4) ◽  
pp. 266-271 ◽  
Author(s):  
Abdelhacine Gouasmia ◽  
Kamel Djeghaba
Keyword(s):  
Dynamic Response ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Soil Layer ◽  
Structural Response ◽  
Soil Structure Interaction ◽  
Frequency Content ◽  
Structure Interaction ◽  
Lateral Displacements ◽  
Input Motion

The objective of this research is to evaluate the effects of soil‐structure interaction (SSI) on the modal characteristics and on the dynamic response of structures. The stress had an impact on the overall behaviour of five storeys reinforced concrete (R/C) buildings typically encountered in Algeria. Sensitivity studies are undertaken in order to study the effects of frequency content of the input motion, frequency of the soil structure system, rigidity and depth of the soil layer on the dynamic response of such structures. This investigation indicated that the rigidity of the soil layer is the predominant factor in soil‐structures interaction and its increases would definitely reduce the deformation of the R/C structures. On the other hand, increasing the period of the underlying soil will cause an increase in the lateral displacements at storey levels and create irregularity in the distribution of storey shears. Possible resonance between the frequency content of the input motion and soil could also play an important role in increasing the structural response.

scholarly journals Soil-structure interaction analysis considering concrete creep and shrinkage

2018 ◽  
Vol 11 (3) ◽  
pp. 564-585 ◽  
Author(s):  
L. M. P. ROSA ◽  
B. R. DANZIGER ◽  
E. M. L. CARVALHO
Keyword(s):  
Structural Analysis ◽  
Structural Design ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Shallow Foundation ◽  
Soil Structure Interaction ◽  
Foundation Design ◽  
Concrete Creep ◽  
Structure Interaction ◽  
Creep And Shrinkage

Abstract The paper presents some results from Rosa’s [1] research that aimed to verify the effect of creep and shrinkage of the concrete in soil-structure interaction. The construction consists in a 17 storeys building. It is set down on shallow foundation, in the central part of the construction, and steel piles, on the boundary. The structure was submitted to instrumentation during construction, including the monitoring of foundation settlements and columns deformation. It was possible to compare the structural design with a numerical refined structural analysis. Comparisons of the structural and foundation design with and without due consideration of soil-structure interaction are also presented. Finally, the different design assumptions were confronted with instrumentation results, both related to foundation settlements and to columns loading as well. Attention is pointed out on the effect of concrete creep and shrinkage in the soil-structure interaction analysis.

Free Vibration Analysis of Building Considering Soil Structure Interaction

2016 ◽  
Vol 857 ◽  
pp. 125-130 ◽  
Author(s):  
Thaiba T. Beegam ◽  
Tissa Sebastian
Keyword(s):  
Soil Structure ◽  
Interaction Analysis ◽  
Soft Soil ◽  
Free Vibration Analysis ◽  
Soil Structure Interaction ◽  
Soil Stiffness ◽  
Structure Interaction ◽  
Winkler Model ◽  
Fixed Base ◽  
Flexible Base

Modeling and design of foundation are always done without considering the effect of stiffness of the soil. In the conventional non-interaction analysis of building frame settlements are calculated without considering the influence of the structural stiffness. Therefore a modeling and interaction analysis of soil structure interaction will help to find soil stiffness and effects of soil structure interaction on structure. In this paper, soil structure interaction analysis of a symmetric space frame of 2 bays in both x and y direction are assessed with SAP 2000 software. The frame is modeled with different storey resting on raft foundation with fixed base and flexible base. Three types of soil, i.e. hard, medium, and soft soil are used for Soil Structure Interaction (SSI) study. MODAL analysis is carried out to illustrate the effects of soil-raft-structure interaction on the response of structures. The Soil is considered as Winkler model and elastic continuum model. The developed methodology is validated with results available in the literature. The effects of SSI on frequency of modal are studied. The comparison is carried out the frame with different base conditions.The frequency of the building was found to be decreased when SSI was considered.

State-of-the-Art Techniques for Seismic Soil-Structure Interaction Analysis of Steel Gravity Structures

2014 ◽  
Author(s):  
Frederick Tajirian ◽  
Mansour Tabatabaie ◽  
Basilio Sumodobila ◽  
Stephen Paulson ◽  
Bill Davies
Keyword(s):  
Soil Structure ◽  
State Of The Art ◽  
Interaction Analysis ◽  
Layered Soil ◽  
Soil Structure Interaction ◽  
Soil System ◽  
Cyclonic Storm ◽  
Structure Interaction ◽  
Analysis Methods ◽  
Moderate Seismicity

The design of steel jacket fixed offshore structures in zones of moderate seismicity is typically governed by Metocean loads. In contrast the steel gravity structure (SGS) presented in this paper, is a heavy and stiff structure. The large mass results in foundation forces from seismic events that may exceed those created by extreme cyclonic storm events. When computing the earthquake response of such structures it is essential to account for soil-structure interaction (SSI) effects. Seismic SSI analysis of the SGS platform was performed using state-of-the-art SSI software, which analyzed a detailed three-dimensional model of the SGS supported on layered soil system. The results of this analysis were then compared with those using industry standard impedance methods whereby the layered soil is replaced by equivalent foundation springs (K) and damping (C). Differences in calculated results resulting from the different ways by which K and C are implemented in different software are presented. The base shear, overturning moment, critical member forces and maximum accelerations were compared for each of the analysis methods. SSI resulted in significant reduction in seismic demands. While it was possible to get reasonable alignment using the different standard industry analysis methods, this was only possible after calibrating the KC foundation model with software that rigorously implements SSI effects. Lessons learned and recommendations for the various methods of analysis are summarized in the paper.

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