To investigate soil structure interaction, a series of dynamic experiments were performed on fullscale mat foundations han, 1989 and on fullscale piles han and novak, 1989, 1992. Quakew has not been formulated with the intent of analyzing the dynamic response of structures to. When external forces, such as earthquakes, act on these systems, neither structural displacements nor ground displacements are independent of each other. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force, load, displacements etc. The program has been developed specifically for practical applications and has the following characteristics. Using this interaction model, you can implement cohesion and internal friction angle of the soilpile interface as well as stiffness of the interaction in both sliding and normal directions. Structural elements can be incorporated into the model, and soil structure interaction accounted for. Kinematic interaction incoherent ground motions base slab averaging u 1 u 2 u 3 s a t.
Earthquake hazards reduction program nehrp earthquake structural and. Recent soil dynamics and earthquake engineering articles. Substructure approach in soil structure interaction. Does anybody know a good software for modelling soil. Missouri university of science and technology scholars mine. Several types of structural elements are available in flac3d. Dynamic soilstructure interaction, volume 83 1st edition. Stated conversely, the presence of a stiff structure could possibly affect the response of the ground to earthquake shaking. The dynamic response of a structure placed on a deformable soil medium subjected to seismic excitation is studied. Flac is used for analysis, testing, and design by geotechnical, civil, and mining. Usually in the seismic design of ordinary building, soil structure interaction is neglected and the dynamic response of the structure is evaluated under the assumption of a fixed based response. Soil structure interaction ssi response analysis for a traditional spra uses linear geometric properties soil and structure are glued together i.
Keywords spring constant, coefficient of subgrade reaction, plaxis software 1. The analysis utilizes soil impedance functions for a structural foundation. For the last couple of decades it has been recognized that the foundation material on which a structure is constructed may interact dynamically with the structure. Safety margins research program, its findings will be incorporated in a. Illustration of direct analysis of soil structure interaction with the help of finite elements. A number of approaches are available to account for dynamic soilpile interaction but they are usually based on the assumptions that the soil behavior is governed by the law of linear elasticity or viscoelasticity, and the soil is perfectly bonded to a pile. Jan 16, 20 dynamic soil structure interaction is one of the major topics in earthquake engineering and soil dynamics since it is closely related to the safety evaluation of many important engineering projects, such as nuclear power plants, to resist earthquakes. Dynamic soilstructure interaction civil engineering community. Effects of soil stiffness on seismic response of buildings. Modeling of dynamic soilstructure interaction by ansys program. All structural elements can be used in both dynamic and static analysis.
What is the most effective software for dynamic analysis of soil. This method is rarely used in practice as it involves large computation and is very complex to analyze. Soil structure interaction modelling slope stability. Estimation of natural frequency and damping factor for dynamic soil structure interaction systems f. What is the most effective software for dynamic analysis. This is especially applicable to areas of seismic activity. Influence of the soil properties on the seismic response of.
The nonlinearity of soil is considered approximately using the boundary zone model with nonreflective interface. Mtrsassi software is a substructuring program that uses the complex frequency response method and finite element technique to solve a wide range of dynamic soilstructure interaction problems. Classification of analysis methods for dynamic soilstructure. The basic phenomena of soil structure interaction was investigated by several analytical models supplemented by experimental observations. It is designed to adapt any kind of geotechnical project. The use of rigid diaphragm model for footings facilitates the connection of the structure to soil.
Dynamic soilstructureinteraction analysis of structures in dense urban environments by katherine carys jones a dissertation submitted in partial satisfaction of the requirements for the degree of doctor of philosophy in engineering civil and environmental engineering in the graduate division of the university of california, berkeley. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. For dynamic analyses soil is modelled using the scaled boundary finite element method sbfem in time domain. Most of the computational results refer to a rigid mat foundation. I am performing an experiment on effect of soil structure interaction on dynamic response of a masonry structure under various seismic excitations. Dynamic soil structure interaction is one of the major topics in earthquake engineering and soil dynamics since it is closely related to the safety evaluation of many important engineering projects, such as nuclear power plants, to resist earthquakes. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. Dynamic soilstructureinteraction analysis of structures. Resilient infrastructure requires that the duration of bounceback, the time to restore functionality after extreme events, is. Numerical analysis of tall buildings considering dynamic soil. Dynamic soil structureinteraction geoslope international. This phd involves the study of transparent soil modelling of soil structure interaction under dynamic conditions, and is supervised by dr nikos nanos and dr mehdi rouholamin soil structure interaction is a wellresearched but still largelyunexplored area of.
A numerical study is made on the dynamic through soil interaction between underground station and nearby pile supported surface structure on viscouselastic soil layer, under vertically incident s wave. They are determined in this paper for a soil which may be. Soil structure dynamic interaction by means of fem bowles, 1996 allows for a complete model of both the superstructure, the foundation system and the sur. The most striking feature in an unbounded soil, which is never encountered in a bounded medium is, in. There are two ways to model the soil in soilstructure interaction.
Also i would like to know of a software for the modelling of soil layers and their effect on the basic acceleration on the surface. Ammar motorwala modelling soil structure interaction for nonlinear dynamic analysis of framed structures with pile foundation 1 p a g e modelling soil structure interaction for nonlinear dynamic analysis of framed structures with pile foundation an earthquake is a phenomenon which basically takes place to dissipate the strain energy accumulated over time at. Earthquake ground motion causes soil displacement known as freefield. The soil structure interaction activity is divided into two parts. Apr 26, 2012 the dynamic analysis and design for a large pump foundation are investigated with different design options. The thesis provides a method for a simple extension of responsespectrum procedures in seismic building analysis to include dynamic soil structure interaction.
What is the most effective software for dynamic analysis of soilstructures such as piled raft. Practical seismic design considering nonlinear soilpile. Transparent soil modelling of soilstructure interaction. Introduction recently, over the period of december 2000 to february 2001, there is an intensive discussion about. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. The intuitive interface will enable new users to easily integrate the software in their work process. Plot of dynamic stiffness modifiers and damping ratios versus. It is assumed that structure is composed of vertical columns, horizontal beams, floors and footings. In a dynamic soil structureinteraction analysis a bounded structure which may be linear or nonlinear, consisting of the actual structure and an adjacent irregular soil if present, will interact with the unbounded infinite or semiinfinite soil which is assumed to be linear elastic. This interaction between the structure and the soil is named soil structure interaction ssi. To simulate the dynamic of soilstructure interaction, a numerical program was developed for this concern. The stiffness matrix of the soil is integrated to that of the structure to formulate the stiffness matrix of the entire system.
Dynamic soil structure interaction 1 introduction the response of the ground can be influenced by the rigidity of a structure. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure. For the floors and footings of the structure, the rigid diaphragm model is used 12. Soil pilestrucrual interaction for practical design purposes, the evaluation of soil pile structure interaction can be done following a simple procedure based on the substructure method. In this study, the effect of soil structure interaction on the dynamic response of structures has been examined. Gts nx is used for analysis, testing, and design by geotechnical, civil, and mining engineers. Sgh performs soil structure interaction ssi analyses to evaluate the true responses of these systems. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and.
In practice, the effects of soil structure interaction on the dynamic response of structures are usually neglected. 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. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of responses of structures. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. Does anybody know a good software for modelling soil structure interaction. Structuresoilstructure interaction between underground. Soilstructure interaction for building structures nehrp. Dynamic soilstructure interaction dr nick oriordan arup abstract geotechnical engineering is at its most unpredictable and uncomfortable when variable or dynamic loads on foundation systems are significantly higher than in the static or at rest condition. The constitutive behavior of the interface is defined by decomposing it into its normal and shear components. Dynamic soilstructure interaction is one of the major topics in earthquake engineering and soil dynamics since it is closely related to the safety evaluation of many important engineering projects, such as nuclear power plants, to resist earthquakes. Soilstructure interaction under dynamic loading scholars mine. However during seismic loading the soil undergoes deformations which are imposed to the foundation, the question naturally arises of knowing if the motion in the vicinity of the structure is altered by. The response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil. In dealing with the analysis of dynamic soilstructure interactions, one of the most difficult tasks is the modeling of unbounded media.
In a dynamic soilstructureinteraction analysis a bounded structure which may be linear or nonlinear, consisting of the actual structure and an adjacent irregular soil if present, will interact with the unbounded infinite or semiinfinite soil which is assumed to be linear elastic. Jul 24, 2019 the objective of this study is to model the interaction between a concrete wall and a soil under seismic loading using the finite element method. The dynamic feature can also be coupled to the groundwater. Dynamic analysis of partially embedded structures considering. Uncertainty in soilstructure interaction analysis arising from. However, the dynamic response of the structure regarding base shear, foundation slab rotation, pile lateral deflection and structure lateral deflection is sensitive to the effect of shear strength with the increase in shear wave velocity and corresponding shear modulus. 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. Mtrsassi software is a substructuring program that uses the complex frequency response method and finite element technique to solve a wide range of dynamic soil structure interaction problems. I need to model the effect on the basic acceleration on field by the existence of near constructions.
Applications are invited for a selffunded, 3 year fulltime or 6 year parttime phd studentship, to commence in february or october. 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. The computational method has been applied to important engineering practice han, 1987, and han, et al, 1999. The impedances stiffness and damping and the dynamic response of foundation are generated from a computer program dynan. This allows, for example, analyses involving timedependent pore pressure change associated with liquefaction. Spra that utilizes nonlinear soilstructure interaction nlssi analysis. Some cornerstones of dynamic soilstructure interaction. The dynamic analysis for the table top structure is a typical problem of soil pile structure interaction. Soil structure interaction broadly can be divided into two phenomena. This paper focuses on the dynamic interaction and the interactive influence on seismic response of adjacent surface structure and underground structure. The concept of structuresoilstructure dynamic interaction was introduced, and the research methods were discussed. Dynamic analysis for foundation of vibrating equipments. A simple soilstructure interaction model sciencedirect. Citescore values are based on citation counts in a given year e.
Analysis and design of structures subjected to arbitrary dynamic loadings especially earthquakes have been studied during past decades. Various combinations of soil and structure can either. Developments in dynamic soilstructure interaction polat gulkan. Soilstructure interaction ssi analysis evaluates the collective response of three. The phenomenon in which the response of soil and movement of the structure influence each other. Based on shaking table model test and using general purpose finite element program ansys, some issues about modeling of soil structure interactionssi. Soilstructure interaction of rigid foundations is characterized by impedance functions. The various methods to perform soilstructureinteraction analysis are classified. 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. Flac, fast lagrangian analysis of continua, is numerical modeling software for advanced geotechnical analysis of soil, rock, groundwater, and ground support in two dimensions. The report provides a method for a simple extension of responsespectrum procedures in seismic building analysis to include dynamic soil structure interaction.
541 1249 928 613 101 65 1269 659 916 1161 1197 274 822 1198 388 1255 1228 1140 897 1009 1390 502 366 354 48 1475 1290 687 2 75 1458 1248 690 1121 849 32 532 1119