Iaea tecdoc on seismic soil structure interaction for. The results are used for both the structural design and the seismic qualification of components, equipments, and systems. Soilfoundation interaction analysis in easyssi youtube. The computer program sassi 1999 is widely used for seismic soil structure interaction ssi analysis of nuclear structures. A system for analysis of soilstructure interaction university of california, berkeley. Epri report 1015111 program on technology innovation. Sgh performs soilstructure interaction ssi analyses to evaluate the true responses of these systems.
Both coherent and incoherent motions were considered. New asce 4 standardbased probabilistic soilstructure interaction ssi. Recent advances in seismic soilstructure interaction analysis of. Linear and nonlinear soilstructure interaction analysis. The earthquake engineering online archive nisee elibrary. Chief of nuclear safety, office of the under secretary for nuclear security.
I need to model the effect on the basic acceleration on field by the existence of near constructions. Gpt inc is a program which performs seismic soil structure interaction 551 analysis. This paper introduces a new alternative for soil pile structure interaction analysis, based on established soil pile interaction theory, which accommodates a wide range of foundation conditions. The computer program sassi 1999 is widely used for seismic soilstructure interaction ssi analysis of nuclear structures. This is especially applicable to areas of seismic activity. The soil profile, structural models and input ground motions used for nonlinear analyses are those from the nees city block project,, which involved the investigation of structuresoilstructure interaction sssi in dense urban regions through centrifuge tests and numerical simulations involving several building models. Structuretostructure interaction foundation with pile groups and battered piles. Acs sassi it is a highly specialized userfriendly, finite element computer code on the ms windows pc platforms for performing efficiently linear or nonlinear 3d dynamic soilstructure interaction ssi analyses for complex geometry foundations subjected to spatially varying incoherent motions or multiple support seismic excitations. Soilstructure interaction analysis of pile foundations. Soilstructure interaction certified training institute. Seismic analyses and design of foundation soil structure. Seismic soilstructure interaction analysis creators. Analysis parameters that affect the accuracy of the calculations, including the. Paper open access soilstructure interaction and motion.
Mar 01, 2018 soil foundation interaction analysis and obtaining impedance functions using truncated cone model developed by meek, veletsos and wolf since 1990s. Sassi is a computer code for performing finite element analyses of soil structure interaction to evaluate the effect of seismic ground motion on structures. The acs sassi software is an extremely user friendly, modern engineering software under ms windows with a unique suite of ssi engineering capabilities. Soil structure interaction ssi analysis is a special field of earthquake engineering. Sassi system software configuration technical report osti. With the advent of powerful computers, ssi analysis capabilities have increased by leaps and bounds.
Does anybody know a good software for modelling soil structure interaction. 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. Soil foundation interaction analysis and obtaining impedance functions using truncated cone model developed by meek, veletsos and wolf since 1990s. Sassi is the system for analysis of soilstructure interaction, a computer code for performing finite element analyses of soilstructure interaction during seismic ground motions. Seismic analysis on the basis of dynamic structurefoundationsoil interaction is a basic requirement in most.
Seismic soilstructure interaction ssi analysis of nuclear power plants. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of responses of structures. How can i model soil structure interaction using spring method in abaqus. Mtr sassi 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. Soil structure interaction ssi knowledge and effect on the seismic assessment of npps structures and components ssi analysis procedure seismic soilstructure interaction ssi analysis of nuclear power plants npps in the united states is often performed in the frequency domain using sassi. In the present paper, a finite element fe model with transmitting boundaries is used to analyse the ssi effect on the response of npp buildings subjected to vertically incident seismic excitation. The structure is typical for romania and highly used throughout the country. The paper investigates the seismic structuresoilstructure interaction effects sssi in densely built urban areas for a 15 floor multistory building mb, a church building cb and a subway station ss in the bucharest city. The second sophisticated analysis uses the modern ssi soil structure interaction methodology currently implemented in the acs sassi software for the design of nuclear structures in the us and all over the globe figure 2. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of. Soilstructure interaction ssi analysis is a special field of earthquake engineering. This project stems in part from our commitments to address sassi technical and software quality assurance issues that were made to the. Doe forwards the report, system for analysis of soil structure interaction sassi software quality assurance practices document.
This paper introduces a new alternative for soilpilestructure interaction analysis, based on established soilpile interaction theory, which accommodates a wide range of foundation conditions. Soil structure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces impacting structure by the definition of seismic excitation. A system for analysis of soilstructure interaction. The sassi system for analysis for soilstructure interaction computer. The code is widely used in the nuclear industry and in the department of energy doe. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure. Soilstructure interaction analysis is often preceded by siteresponse analysis, in order to calculate the foundation input ground motion. The response of the ground and nearby structures to tunnelling constitutes a complex soilstructure interaction boundary value problem. The program has been developed specifically for practical applications and has the following characteristics. System for analysis of soilstructure interaction sassi. Pdf seismic structure soilstructure interaction sssi.
Sassi system software configuration technical report. The site is modelled as a series of horizontal layers overlying a. The sassi system for analysis for soil structure interaction computer program was obtained by whc from the university of california at berkeley for seismic structural analysis of complex embedded building configurations. Npps in the united states is often performed in the frequency domain using sassi. Sassi is the system for analysis of soilstructure interaction, a computer code.
Soilstructure interaction ssi analysis has been recognized to be an essential step in the design of important structures. Mtrsassi software is a substructuring program that uses the complex frequency response method and finite element technique to solve a wide range of dynamic. The soilstructure interaction analyses were performed for both coherent synchronous and incoherent non. Iaea tecdoc on seismic soil structure interaction for design. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces im pacting structure by the definition of seismic excitation. The response of nuclear power plants npps to seismic events is affected by soilstructure interactions ssi. The software is a userfriendly finite element computer code on the ms windows pc platforms for performing efficiently linear or nonlinear 3d dynamic soilstructure interaction ssi analyses for complex geometry foundations subjected to spatially varying incoherent motions or multiple support. Analysis of seismic soilstructure interaction for a nuclear. The second sophisticated analysis uses the modern ssi soilstructure interaction methodology currently implemented in the acs sassi software for the design of nuclear structures in the us and all over the globe figure 2. The acs sassi software uses the flexible volume substructuring fvs in complex. An advanced computational software for 3d dynamic analysis including soilstructure interaction show more show less uploads play all. The objective of this final phase is to demonstrate that classi and sassi, as modified, adequately calculate the seismic response of foundations and structures when subjected to seismic wave fields including incoherence effects. Spra that utilizes nonlinear soilstructure interaction nlssi analysis. A method for converting the ansys and lsdyna finite.
These methods are the basis for computation of the impedance matrix as. Sassi fe program for seismic response analysis of nuclear. The soil profile, structural models and input ground motions used for nonlinear analyses are those from the nees city block project,, which involved the investigation of structure soil structure interaction sssi in dense urban regions through centrifuge tests and numerical simulations involving several building models. Doe forwards the report, system for analysis of soil. Current practice of siteresponse and ssi analysis in the u. Complex response analysis of soil structures systems by the finite element method. 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. Geotechnique papers published over the past 60 years that. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. A description of the theoretical formulation and its implementation into the prevalent sassi software framework via sc.
Sc solutions proprietary soil structure interaction ssi analysis tool, scsassi. Sassi is a computer code for performing finite element analyses of soilstructure interaction to evaluate the effect of seismic ground motion on structures. By way of illustration, a piece of seismic software, named seismosignal. Linear and nonlinear soilstructure interaction analysis of. Complex response analysis of soilstructures systems by the finite element method. 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.
Sc solutions provides software technical support, training, and consulting. The response of nuclear power plants npps to seismic events is affected by soil structure interactions ssi. Seismic structure soilstructure interaction sssi effects. Recent advances in seismic soilstructure interaction. Sgh performs soil structure interaction ssi analyses to evaluate the true responses of these systems. The program has been developed specifically for practical. Soil shear modulus g and hysteretic damping d, as random functions of the soil shear strain values for each soil layer, and equivalent linear values for the effective structural stiffness and damping for each group of elements depending on the stress levels in different parts of the structure. Soil structure interaction analysis using acssassi. Soilstructure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. Acs sassi is a software suite that simulates the soil structure interaction of building during an earthquake. It was first developed at the university of californiaberkeley in 1981. Engineering tools ghiocel predictive technologies, inc. An advanced computational software for 3d dynamic analysis including soil structure interaction show more show less uploads play all.
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. The acs sassi software is an extremely user friendly, modern engineering software under ms windows with a unique suite of ssi engineering. Soilstructure 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. The seismic soilstructure interaction were performed using the stateoftheart acs sassi software. Analysis of seismic soilstructure interaction for a. Sassi is widely used within doe, and across the nuclear industry, to analyze the effect of seismic ground motions on structures, and its outputs. 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. The software is a userfriendly finite element computer code on the ms windows pc platforms for performing efficiently linear or nonlinear 3d dynamic soil structure interaction ssi analyses for complex geometry foundations subjected to spatially varying incoherent motions or multiple support. Sassi is widely used within doe, and across the nuclear industry, to analyze the effect of seismic ground motions on strnctures, and its outputs. The response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil. Acs sassi acs sassi is a highly specialized soilstructure. Although numerous methods have been proposed in the last several decades, the sassi program remains. Soil structure interaction ssi knowledge and effect on the seismic assessment of npps structures and components ssi analysis procedure seismic soil structure interaction ssi analysis of nuclear power plants npps in the united states is often performed in the frequency domain using sassi. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and.
Acs sassi it is a highly specialized userfriendly, finite element computer code on the ms windows pc platforms for performing efficiently linear or nonlinear 3d dynamic soil structure interaction ssi analyses for complex geometry foundations subjected to spatially varying incoherent motions or multiple support seismic excitations. Acs sassi is a highly specialized soil structure interaction ssi finite element analysis software. First introduced in 2012, scsassi is based on the classic system for analysis of soilstructure interaction sassi code originally developed at uc berkeley, but has been rewritten from the ground up for todays highperformance computing hpc platforms. Soil structure interaction broadly can be divided into two phenomena.
Sassi is the system for analysis of soil structure interaction, a computer code for performing finite element analyses of soil structure interaction during seismic ground motions. Common sense tells us that every seismic structural response is caused by soil structure interaction forces impacting structure by the definition of seismic excitation. The program offers two main substructuring methods. 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. Seismic soil structure interaction analysis creators.
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