Free and forced vibrations, damped and undamped systems, equation of motion, response spectra. Feb 29, 2012 ssi effects alter the natural frequency of the structure. By these means the soil structure interaction effects were also examined. This book describes how a number of different methods of analysis and modelling, including the boundary element method, the finite element method, and a range of classical methods, are used to answer some of the questions associated with soilstructure interaction. Rao presents a wide array of numerical methods used in analyses so that. It was mainly found that depending on the structural type and for a. Maugeri department of civil and en vironmen tal engineering, university of catania, italy abstract the present paper deals with a parametric study of soil foundationframe interaction in pseudostatic conditions by means of a new finite element code, named sofia. Soilstructure interaction for building structures nist. The term free field refers to motions that are not affected.
Numerical analysis of nonlinear soil structure interaction m. Part ii1 soil composition, index properties and soil classification pdf 1. Damage is also caused by working soil when it is either too that the structure has been eunit. Soilstructure interaction using computer and material models covers computer and analytical methods for a number of geotechnical problems. Laterally loaded piles, reese and matlocks generalized solution, displacement of pile group. Numerical analysis of nonlinear soilstructure interaction m. Soilstructure interaction broadly can be divided into two phenomena. Ssi modelling and specific field applications jan 4 jan 6 number of participants for the course will be limited to fifty. The paper compares how different models include soilstructureinteraction into the structural model taking into account the flexibility of the foundation slab as well as the stiffness and radiation damping of the soil. Figure 3 general procedure for seismic soil pile foundation structure interaction gazetas et. Soil structure interaction ssi analysis traditional spra in involves the use of linear geometric properties soil and structure are glued together, namely, the soil undergoes tension when structure uplifts, linear soilproperties, and linear structure properties. Dynamic analyses of various geotechnical structures like retaining wall, soil slope, railway subgrade and ballast using msd model. Soilstructure interaction 0mgt301 marwadi university. Motion, wave propagation, dynamic soil properties, seismic hazard analysis, site response analysis, dynamic soil structure interaction, soil improvement techniques course detail sl.
Maugeri department of civil and en vironmen tal engineering, university of catania, italy abstract the present paper deals with a parametric study of soilfoundationframe interaction in pseudostatic conditions by means of a new finite element code, named sofia. The course will focus on the different soil structure interaction models for shallow foundation under various loading conditions and subgrade characteristics. Figure 3 general procedure for seismic soilpile foundationstructure interaction gazetas et. A system for analysis of soilstructure interaction. Soilstructure interaction large civil structures such as concrete dams, nuclear power plants, highrise buildings and bridges are massive enough that their vibration due to earthquake excitation affects the motion of the soil or rock supporting them,which in turn further affects the motion of the struc.
When external forces, such as earthquakes, act on these systems, neither structural displacements nor ground displacements are independent of each other. All the structures were also analyzed as base isolated. Various combinations of soil and structure can either. Examples of soil structure interaction sheetpile walls prestressed anchors diapraghm walls nailing foundation rafts with piles buildingfoundation in all the above problems strong displacementpressure discontinuity may appear. Sep, 2012 soil structure interaction ssi analysis evaluates the collective response of three linked systems. Soil mechanics lectures, class notes, research manuals. It is difficult to solve ssi with analytical methods. Nptel provides elearning through online web and video courses various streams.
Soil has many different meanings, depending on the field of study. The direct method is used for modeling the soil and a tall building together. General introduction, importance and applications of soil structure interaction ssi, soil structure interaction parameters dec 28 dec 31, 2015 b. The terms soilstructure interaction ssi and soilfoundationstructure interaction sfsi are both used to describe this effect 6. Soilstructure dynamic interaction by means of fem bowles, 1996 allows for a complete model of both the superstructure, the foundation system and the sur. Kousik deb,department of civil engineering,iit kharagpur. It introduces the main factors important to the application of computer methods and constitutive models with emphasis.
To a geotechnical engineer, soil has a much broader meaning and can. The paper compares how different models include soil structure interaction into the structural model taking into account the flexibility of the foundation slab as well as the stiffness and radiation damping of the soil. The mission of nptel is to enhance the quality of engineering education in the. Nonlinear behavior in a soil structure system can be classified into 1 nonlinear site response primary nonlinearities, which affects the free field soil response, and therefore the ground motion input to the structure and 2 nonlinear behavior at the foundation soil hysteresis, gapping, sliding and nonlinear structural behavior secondary. Soilstructure interaction civil engineering ce notes. Overall strain of a soil mass is the combined effect of particle deformation and interparticle sliding. 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. Analysis of dynamic behavior of soil structure interaction ssi is a complicated problem due to the complexities of soil behaviors and dynamic analysis. The sliding displacement of the isolated structure on s1 type of soil is not affected much due to the fundamental time period of the fixed base structure, whereas, the sliding displacement of the structure on rigid base and on s3 type of soil is sensitive to the fundamental time period of fixed base structure in the range of 0. For the love of physics walter lewin may 16, 2011 duration. Soilstructure interaction livermore software technology. Nptel introduction to earthquake engineering seismic soil structure interaction iit bombay.
Soilstructure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Deb has offered course on foundation engineering under nptel online certification programme. Examples of soilstructure interaction sheetpile walls prestressed anchors diapraghm walls nailing foundation rafts with piles buildingfoundation in all the above problems strong displacementpressure discontinuity may appear. Numerical analysis of nonlinear soilstructure interaction. Lecture notes soil behavior mit opencourseware free. Size particles particle size distribution aggregates drysieving. Problems associated with practical application of ssi for building structures are rooted in a poor understanding of fundamental ssi principles. This is especially applicable to areas of seismic activity. The finite element model of the isolated structurefoundationsoil system is shown in fig. Kameswara rao covers the key aspects of the subject, including principles of testing, interpretation, analysis, soilstructure interaction modeling, construction guidelines, and applications to rational design. Jun 23, 2016 soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. Soil aggregates is the term used to describe the individual soil particles bound together.
Aggregated ideal soil structure characterization of soil structure. Use of finite difference method fdm for soil structure interaction problems week 11. Soilstructure interaction response to high amplitude forced vibration d. In the present analysis the soil is assumed as an elastic continuum and finite element method is used to model the soil. Sundaravadivelu,department of ocean engineering,iit madras. Soil structure is based on the arrangement of individual particles of sand, silt and clay. Effect of soilstructure interaction on seismic response of. Analyse the structure with soil structure interaction effects to obtain the realistic response. A system for analysis of soilstructure interaction university of california, berkeley. Four different structures and three different sites were analyzed under two different input motions. There are two methods available for modeling the soilstructure interaction ssi. Soil mechanics in engineering practice lectures soil mechanics introduction and definition soil mechanics is defined as the application of the laws and principles of mechanics and hydraulics to engineering problems dealing with soil as an engineering material.
Soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. However, numerical methods with highly developed computer technique are efficient. Piles under uplift and lateral loading conditions will also be discussed. Figure 727 response spectra for foundation input motion, ufim, and freefield. If the structure is supported on soft soil deposit, the inability of the foundation to. An application of the approach to study bridge response to soil pile structure interaction under earthquake loading is described by. Linear and nonlinear soilstructure interaction analysis. Dynamic analyses of various geotechnical structures like retaining wall, soil slope, railway subgrade and.
Use of finite difference method for soil structure interaction problems. It influences the behavior of soil, as well as the response of pile under loading. To develop suitable soil testing devices and soil testing methods. Spra that utilizes nonlinear soilstructure interaction nlssi analysis. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure. Characteristics of ssi characterization of the soil structure interaction is followed by two significant effects as. A major cause of damage is driving heavy equipment over wet soil. Structure is modeled as an assemblage of two noded plane frame element with two translational and one rotational degree of freedom at each node.
Ssi effects alter the natural frequency of the structure. Based on the advanced nonlinear finite element analysis software msc. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure interaction designation for this area of study. Page 1 nptel geotechnical earthquake engineering dept.
Soilstructure interaction civil engineering ce notes edurev. Analysis of dynamic behavior of soilstructure interaction ssi is a complicated problem due to the complexities of soil behaviors and dynamic analysis. Soil structure interaction response to high amplitude forced vibration d. Effect of soilstructure interaction on seismic response. Rao presents a wide array of numerical methods used in analyses so that readers can employ and adapt them on their own. Nptel syllabus geotechnical earthquake engineering video course. An application of the approach to study bridge response to soilpilestructure interaction under earthquake loading is described by. Effect of interactions on dynamic active earth pressures m. Therefore, the soilstructure interaction ssi can be defined as the process by which the response of the soil affects the motion of the structure and that effect of motion of the structure further affects the response of the soil is termed as ssi. Nptel provides elearning through online web and video courses in engineering, science and humanities streams. Preliminaries in this portion, we describe the characteristics, approaches, types, degree of impact of soil structure interaction in brief. Dynamic soil structure interaction, soil improvement techniques course detail sl. George and mylonakis, george, soilstructure interaction effects on elastic and inelastic structures 2001.
Soilstructure interaction is an area of major importance in geotechnical engineering and geomechanics advanced geotechnical engineering. Nptel syllabus geotechnical earthquake engineering. Sassi system for analysis of soil structure interaction. It introduces the main factors important to the application of. Technical paper soilstructure institution of civil. This book describes how a number of different methods of analysis and modelling, including the boundary element method, the finite element method, and a range of classical methods, are used to answer some of the questions associated with soil structure interaction. Soil structure damage soil structure can be destroyed. Soilstructure interaction for building structures nehrp. The analysis is highly essential for predicting a more accurate structural behavior so as to improve the safety of structures under extreme loading conditions. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. International conferences on recent advances in geotechnical earthquake engineering and soil dynamics. Relative sliding of soil particles result in rearrangementof soil particles, which is a nonlinear and irreversible phenomena, thus resulting in a nonlinear and irreversible stressstrain behavior of soils.
The change in understanding of the sitespecific seismic. Soilstructure interaction ssi analysis evaluates the collective response of three linked systems. To develop rational soil sampling devices and soil sampling methods. Case case histories show that residual tilt can occur even if the soil is assumed to be relatively. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. It is primarily an exchange of mutual stress, whereby the movement of the groundstructure system is influenced by both the type of ground and the type of structure. Analysis of soilstructure interaction with finite element. The course will focus on the different soilstructure interaction models for shallow. Indian institute of technology, kanpur 1 module 4 ground response analysis lectures 17 to 22 lecture 22 topics 4. Introduction to soil mechanics geotechnical engineering. The earthquake wavesoilstructure interaction analysis of tall buildings is the main focus of this research.
Weathering of rocks and types of soil, physical properties, e. Soil structure interaction has little effect on the dynamic response of. Group action of pile, elastic analysis, settlement of pile group under compressive load by interaction factor approach, negative skin friction. Free download engineering ebooks pdf ppt lecture notes. 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. Earthquake wavesoilstructure interaction analysis of. Soilstructure interaction analysis of a fpsisolated. The phenomenon in which the response of soil and movement of the structure influence each other. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Soilstructure interaction ssi analysis evaluates the collective response of three.
Soilstructure interaction livermore software technology corp. Aug, 2014 for the love of physics walter lewin may 16, 2011 duration. Inertial soil structure interaction inertia from vibration of structure and foundation. However, the foundation embedded into the soil will not follow the free field motion. To collect and classify soils and their physical properties on the basis of fundamental knowledge of soil mechanics. Earthquake ground motion causes soil displacement known as free field motion.
1460 146 1442 969 422 1139 443 1450 1379 1144 1415 1132 38 1155 756 312 1468 932 612 1054 387 255 1040 688 1272 530 234 1275 717 1274 465 868 189 1153 199 75 1328 931 1324 1467 838