Based on conventional theories it has been said that the soil structure interaction has effects that are beneficial for the structural response. The spatial variation of soil structure on farmers fields finke, 1992, 1993 and in catenary sequences in the landscape extends the scale to kilometers. Soilfoundationstructure interaction crc press book. Furthermore, according to fema 2000 the effects of soilstructure interaction must be evaluated for nearfield and soft soil sites and also for buildings in. Soil structure interaction and structural response. Effect of soilfoundationstructure interaction and pier column nonlinearity on seismic response of bridges supported on shallow foundations muhammad tariq a. The purpose of this chapter is to illustrate whether and under which conditions ssi is important and what are its consequences on the dynamic response of the structure. Beneficial and detrimental effects of soilstructure. The interaction between soil and foundation becomes meaningful especially in the case of rigid structures and foundations, being. Winkler spring and half space direct method models are used for flexible base for the frames founded on two types of soft soils. The idealised design spectra of the codes along with the increased fundamental period and effective damping due to ssi lead invariably to reduced forces in the. Study of soil structure interaction effect on multistory.
Binormalized response spectrum for a rational soil. Soil foundation structure interaction contains selected papers presented at the international workshop on soil foundation structure interaction held in auckland, new zealand from 2627 november 2009. Usually in the seismic design of ordinary building, soil structure interaction is neglected and the dynamic response of the structure is evaluated under the. Technical paper soilstructure institution of civil. Chaudhary department of civil engineering, college of engineering, kuwait university, p. Soilstructure interaction for building structures nehrp.
Seismic analyses and design of foundation soil structure. Ssi effects alter the natural frequency of the structure. Vertical static and dynamic piletopile interaction in. This interaction between the structure and the soil is named soil structure interaction ssi. Filename, seabc 1 soil structure interaction 25 26 june 2010 blair gohl the structural engineers association of british columbia a technical seminar about modeling soil structure interaction in the analysis of buildings and bridges, and how the design of structures is affected by the incorporation of ssi effects. In this work, analysis of pile soil structure interaction has been studied by finite element software ansys 11.
An analytical model was then proposed to reproduce the structure and soilstructure system behaviour. This interaction between the structure and the soil is named soilstructure interaction ssi. Structural system is influenced by the type of soil as well as the type of structure. Two model 2d rc frames with 7 and 12 story are selected for analysis. Soilstructure interaction broadly can be divided into two phenomena. Soilstructure interaction effects on seismic behaviour of. The topic of this paper is to illustrate on a real project one aspect of soil structure interaction for a piled foundation. Because of the limitations of testing facilities and techniques, the seismic performance of soilstructure interaction ssi system can only be tested in a quite small scale model in laboratory. Chapter 6 seismic analyses and design of foundation soil. The importance of performance based design approaches and soil structure interaction in seismic design of structures are internationally recognized.
Feb 29, 2012 ssi effects alter the natural frequency of the structure. Soilstructure interaction effects on elastic and inelastic. The aim of this chapter is to demonstrate that potentially micromorphology provides a unique set of tools to study soil structure because it is the study of the in situ reality of soil and undisturbed soil samples and can span many levels of scale using the appropriate observation techniques bisdom et al. Seismic codes have universally adopted smooth design acceleration spectra, on the basis of averaging of a large number of elastic response spectra of actual recordings. Soilstructure interaction modelling for piles in performancebased seismic design. George gazetas a department of civil engineering, city university of new york, new york, ny 10031, usa to cite this article mylonakis, george and gazetas, george2000 seismic soilstructure interaction. Furthermore, according to fema 2000 the effects of soil structure interaction must be evaluated for nearfield and soft soil sites and also for buildings in. Study of soil structure interaction effect on multistory rc. Soilfoundationstructure interaction in shallow foundation. Soilstructure interaction is an important issue in the dynamics of structures, being not taken into consideration, in many cases, due to complex volume of computations. Soil dynamics 2001 fourth international conference on recent advances in geotechnical earthquake engineering and soil dynamics mar 26th, 12.
Foundation uplifting and soil yielding george gazetas 1 and marios apostolou2 the study investigates the response of shallow foundations subjected to strong earthquake shaking. Introduction structures founded on hard soil and rock are tradition. George gazetas a department of civil engineering, city university of new york, new york, ny 10031, usa to cite this article mylonakis, george and gazetas, george2000 seismic soil structure interaction. Soilfoundationstructure interaction contains selected papers presented at the international workshop on soilfoundationstructure interaction held in auckland, new zealand from 2627 november 2009. Journal of earthquake engineering seismic soilstructure. Theoretical manual, civil engineering department, university of. Impact of soil structure interaction on response of structures seminar 1. The workshop was the venue for an international exchange of ideas, disseminating information ab. Nov 07, 2017 considering soil structure interaction makes a structure more flexible and thus, increasing the natural period of the structure compared to the corresponding rigidly supported structure. Effect of soilstructure interaction on seismic performance of long. Such an interdependent behaviour between soil and structure regulating the overall response is referred to as soil structure interaction s v datta. The terms soilstructure interaction ssi and soilfoundationstructure interaction sfsi are both used to describe this effect 6. Pdf soilstructure interaction on the dynamic response of bridge. The third ujnr workshop on soilstructure interaction ssi was held on march 29.
Dynamic stiffness and damping of a shallow foundation from. Soilstructure interaction ssi analysis evaluates the collective response of three linked systems. Seismic soilstructure interaction ssi is not free of misconceptions. The role of soil structure interaction ssi in the seismic response of structures is reexplored using recorded motions and theoretical considerations. Nonlinear soil foundation effects associated with large. Considering soilstructure interaction makes a structure more flexible and thus increases the natural period of the structure as compared to the corresponding rigidly supported structure.
Based on several documents, a systematic summary of the history and status of the structuresoilstructure dynamic interaction research that considers adjacent structures was proposed as a reference for researchers. Effects of dynamic soilstructure interaction on inelastic. Seismic soilstructure interaction analysis of ventilation stack. Because of the limitations of testing facilities and techniques, the seismic performance of soil structure interaction ssi system can only be tested in a quite small scale model in laboratory. Seismic response of rc irregular frame with soilstructure interaction nirav m. Classical soilstructure interaction and the new zealand.
The workshop was the venue for an international exchange of ideas, disseminating information about experiments, numerical models and practical engineering problems relating to soilfoundation. A synthesis of available numerical solutions for impedance functions is given by gazetas 1991. Soil structure interaction broadly can be divided into two phenomena. Numerical modeling of dynamic soilpilestructure interaction abstract by surendran balendra, m. The importance of soilstructure interaction ssi effects on the seismic. The role of soilstructure interaction ssi in the seismic response of structures is reexplored using recorded motions and theoretical considerations. Dynamic analysis of soil structure interaction effect on multi story rc frame article pdf available in open journal of civil engineering 0804. Soilstructure interaction, dynamic behavior of soil, seismic design, damping. The purpose of this study is to investigate the soil structure interaction ssi effect on the overall risk of a pwr containment building structure with respect to two failure modes. Shah2 1me structural engineering student, 2assistant professor 1hjd institute of technical education and research, kera kutch, india. The term freefield refers to motions that are not affected. Introduction impedance functions represent the frequencydependent stiffness and damping characteristics of foundationsoil interaction.
Practical applications to shallow foundations flexible base properties soil properties foundation dimensions initial shear modulus 31 ksi length, l 26 ft width, b 3 ft unit wt. While structures on isolated footings are prone to collapse, buildings lying. Chapter 6 seismic analyses and design of foundation soil structure interaction alain pecker abstract the topic of this paper is to illustrate on a real project one. Binormalized response spectrum for a rational soilstructure interaction analysis g. Effect of soilstructure interaction in seismic analysis of. Soilstructure interaction effects on the seismic response of low. Oregon state university for pacific northwest transportation consortium pactrans usdot university transportation center for federal region 10 university of washington. Limitations if distributed shear walls, must consider coupling of. Earthquake ground motion causes soil displacement known as freefield. The analysis of the deformation of the structure has been assessed by computing the spectral ratio between the top and the bottom, with a special focus on soilstructure interaction. Seismic safety margins research program responsibility prepared by j. Firstly, the way current seismic provisions treat ssi effects is briefly discussed.
The study of soil structure ranges from the effects of particle interaction at a scale of nanometers quirk, 1994 to the functioning of soil structure profiles at a scale of meters miedema et al. Soilfoundationstructure interaction in shallow foundation springbed modelling 4 in the gazetas et al. This cited by count includes citations to the following articles in scholar. As a result, a group of rigidly capped piles exhibits a forcesettlement ratio vertical stiffness that is smaller than the sum of the individual stiffnesses of each pile efficiency in static stiffness less than 1. The raft foundation is used support structure and it. Most of the design codes for structures recommends neglecting the effect of ssi in the seismic analysis of the structure. Adrian rodriguezmarek the analysis of structures subject to earthquake ground motions must properly account for the interaction between the foundation and the superstructure. Kinematic interaction is well recognized as being the cause of the development of significant internal forces in the piles under seismic loading. The terms soil structure interaction ssi and soil foundation structure interaction sfsi are both used to describe this effect 6. Fema 2000 implies that soil structure interaction may modify the seismic demand on a building. It was attended by 56 researchers and practitioners, mostly from united states and japan, which are the carriers of the charter of the. The effect of soil structure interaction should be considered in the buildings which are located in the earthquake prone areas and an attempt has been made during. Effect of soilstructure interaction in seismic analysis. Pdf the role of soilstructure interaction ssi in the seismic response of.
Considering soil structure interaction makes a structure more flexible and thus increases the natural period of the structure as compared to the corresponding rigidly supported structure. Fema 2000 implies that soilstructure interaction may modify the seismic demand on a building. The concept of structuresoilstructure dynamic interaction was introduced, and the research methods were discussed. The seismic response of midrise frame structures rested on soft soils is susceptible to the dynamic interaction between structure, foundation and soil, called soil structure interaction ssi. Effect of soil foundation structure interaction and pier column nonlinearity on seismic response of bridges supported on shallow foundations muhammad tariq a. Ziotopoulou national technical university of athens, greece abstract. Foundation impedance ordinates are identified from forced vibration tests conducted on a largescale model test structure in. Pdf the paper analyses the effect of soilstructureinteraction ssi on the modal dynamic.
The soil structure interact ion has been found to be significantly affecting the performance of structure and it is discussed in this paper. Impact of soilstructure interaction on response of structures seminar 1. When a structure is subjected to an earthquake excitation, it interacts with the foundation and the soil, and thus changes the motion of the ground. A vertically loaded floating pile in clay affects a neighbouring pile by increasing the latters displacement due to its own load. Considering soilstructure interaction makes a structure more flexible and thus, increasing the natural period of the structure compared to the corresponding rigidly supported structure. Gazetas 1 model is used for representing stiffness of soil and the foundation. The purpose of this study is to investigate the soilstructure interaction ssi effect on the overall risk of a pwr containment building structure with respect to two failure modes. Effect of soilstructure interaction on seismic performance. The scale effect resulting from the small scale model is always coupled with.
In this study dynamic analysis of soil structure interaction ssi effect on multi story reinforced concrete rc frame founded on soft soil flexible base is made and compared with fixed base. The precise quantification of the risk within the seismic probabilistic risk assessment framework depends considerably on an accurate treatment of the seismic response analysis. Overview of soilstructure interaction principles jonathan p. Effect of soilfoundationstructure interaction and pier. Pdf dynamic analysis of soil structure interaction. Filename, seabc 1 soil structure interaction 25 26 june 2010 blair gohl the structural engineers association of british columbia a technical seminar about modeling soilstructure interaction in the analysis of buildings and bridges, and how the design of structures is affected by the incorporation of ssi effects. Soilfoundationstructure interactions effects in seismic behavior of. Especially for longspan bridge, a smaller tested model is required when ssi phenomenon is considered in the physical test. Recent case studies suggest, however, that the soilstructure interaction can somethimes be detrimental to seismic behavior of structures e. Soilbridge interaction during longduration earthquake motions final project report by andre r. Dynamic stiffness and damping of a shallow foundation from forced vibration of a field test structure salih tileylioglu, a. Seismic analyses and design of foundation soil structure interaction.
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