Soil structure interaction broadly can be divided into two phenomena. I need to model the effect on the basic acceleration on field by the existence of near constructions. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of responses of structures. Analysis of seismic soilstructure interaction for a. Soilstructure interaction ssi analysis is a special field of earthquake engineering. Doe letter documenting the completion of the project to. Report to defense nuclear facilities safety board on system for analysis of soil structure interaction sassi software quality assurance practices 1 background the system for analysis of soil structure interaction sassi is a computer code for performing finite element analyses of soilstructure interaction ssi during seismic ground motions. Linear and nonlinear soilstructure interaction analysis. Discuss seismic input, soil profiles, site response analysis and ssi analysis.
The acs sassi software uses the flexible volume substructuring fvs in complex. Mar 01, 2018 soil foundation interaction analysis and obtaining impedance functions using truncated cone model developed by meek, veletsos and wolf since 1990s. Sgh performs soilstructure interaction ssi analyses to evaluate the true responses of these systems. Sassi is widely used within doe, and across the nuclear industry, to analyze the effect of seismic ground motions on structures, and its outputs. Soil structure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. The new added soilstructure interaction capabilities make acs sassi the. The program offers two main substructuring methods.
The response of nuclear power plants npps to seismic events is affected by soilstructure interactions ssi. Linear and nonlinear soilstructure interaction analysis of. A system for analysis of soil structure interaction university of california, berkeley. Fast nonlinear seismic soilstructure interaction ssi analysis of nuclear. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of. A description of the theoretical formulation and its implementation into the prevalent sassi software framework via sc. 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. Gpt inc is a program which performs seismic soilstructure interaction 551 analysis. Sc solutions proprietary soil structure interaction ssi analysis tool, scsassi.
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. Sgh performs soil structure interaction ssi analyses to evaluate the true responses of these systems. Welcome to soilstructure software tm soilstructure software. Discuss the kinematic and inertial ssi effects on seismic structural response. 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. The acs sassi software is an extremely user friendly, modern engineering software under ms windows with a unique suite of ssi engineering. Acs sassi acs sassi is a highly specialized soilstructure. Soil foundation interaction analysis and obtaining impedance functions using truncated cone model developed by meek, veletsos and wolf since 1990s. The results are used for both the structural design and the seismic qualification of components, equipments, and systems. Over the past 30 years, the program sassi has evolved. The response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force, load, displacements etc. Acs sassi is a highly specialized soilstructure interaction ssi finite element analysis software. First introduced in 2012, sc sassi is based on the classic system for analysis of soil structure interaction sassi code originally developed at uc berkeley, but has been rewritten from the ground up for todays highperformance computing hpc platforms.
Report to defense nuclear facilities safety board on system for analysis of soil structure interaction sassi software quality assurance practices 1 background the system for analysis of soil structure interaction sassi is a computer code for performing finite element analyses of soil structure interaction ssi during seismic ground motions. Paper open access soilstructure interaction and motion. Common sense tells us that every seismic structural response is caused by soil structure interaction forces impacting structure by the definition of seismic excitation. Soil structure interaction analysis is often preceded by siteresponse analysis, in order to calculate the foundation input ground motion. Seismic soilstructure interaction analysis creators. With the advent of powerful computers, ssi analysis capabilities have increased by leaps and bounds. 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. This is especially applicable to areas of seismic activity. 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. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and. Various combinations of soil and structure can either. The sassi analyses are performed using equivalentlinear properties for the soil layers.
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. 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. It was first developed at the university of californiaberkeley in 1981. The computer program sassi 1999 is widely used for seismic soil structure interaction ssi analysis of nuclear structures.
Applicaiton of the computer program sassi for seismic ssi. The program has been developed specifically for practical. In addition to the computational speed improvements through a full parallelization of the code that makes it hundreds of times faster than the university sassi code, acs sassi includes a totally new set soil structure interaction analysis capabilities that extends the linearized sassi methodology to nonlinear soil and. Epri report 1015111 program on technology innovation. Chief of nuclear safety, office of the under secretary for nuclear security. Common sense tells us that every seismic structural response is caused by soil structure interaction forces im pacting structure by the definition of seismic excitation. 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. Seismic soilstructure interaction ssi analysis of nuclear power plants. Structuretostructure interaction foundation with pile groups and battered piles. 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.
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 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. 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. 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. These methods are the basis for computation of the impedance matrix as.
Recent advances in seismic soilstructure interaction analysis of. Doe forwards the report, system for analysis of soil structure interaction sassi software quality assurance practices document. Soilstructure interaction ssi analysis has been recognized to be an essential step in the design of important structures. Earthquake ground motion causes soil displacement known as freefield. Sassi is the system for analysis of soilstructure interaction, a computer code for performing finite element analyses of soilstructure interaction during seismic ground motions. Analysis parameters that affect the accuracy of the calculations, including the. Recent advances in seismic soilstructure interaction. There is a consensus that these frequencydomain codes give. Engineering tools ghiocel predictive technologies, inc. 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. Soilstructure interaction ssi analysis in the nuclear industry is currently performed using linear codes that function in the frequency domain. There are different research software are there to analyses the slope stability. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces im pacting structure by the definition of seismic excitation.
Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. Does anybody know a good software for modelling soil structure interaction. Soilstructure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. Sc solutions provides software technical support, training, and consulting. 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 analysis using acssassi. In the eld of soilbuilding interaction acs sassi is currently the leading software package from ghiocel predictive technologies inc. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure. Acs sassi is a highly specialized soil structure interaction ssi finite element analysis software. An advanced computational software for 3d dynamic analysis including soilstructure interaction show more show less uploads play all. How can i model soil structure interaction using spring method in abaqus. 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. Acs sassi is a software suite that simulates the soil structure interaction of building during an earthquake. Doe forwards the report, system for analysis of soil.
A system for analysis of soilstructure interaction university of california, berkeley. An advanced computational software for 3d dynamic analysis including soil structure interaction show more show less uploads play all. Seismic analyses and design of foundation soil structure. Gpt inc is a program which performs seismic soil structure interaction 551 analysis.
Soilfoundation interaction analysis in easyssi youtube. Sassi system software configuration technical report. System for analysis of soilstructure interaction sassi. 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. Current practice of siteresponse and ssi analysis in the u.
Soilstructure interaction certified training institute. Ostadan f, nan d 2012 sassi 2010 a system for analysis of soilstructure interaction. The acs sassi software is a software in a continuous fast development. After more than a quarter century of consulting engineering work, i have come to the conclusion that our project engineers need robust software with familiar inputs. Soil structure interaction ssi analysis is a special field of earthquake engineering. Both coherent and incoherent motions were considered. 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. Does anybody know a good software for modelling soil. A system for analysis of soilstructure interaction. Seismic structure soilstructure interaction sssi effects. The sassi system for analysis for soilstructure interaction computer. The program has been developed specifically for practical applications and has the following characteristics. The site is modelled as a series of horizontal layers overlying a.
This project stems in part from our commitments to address sassi technical and software quality assurance issues that were made to the. 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. Discuss also structuresoilstructure interaction effects. Soilstructure interaction livermore software technology. Npps in the united states is often performed in the frequency domain using sassi. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. Although numerous methods have been proposed in the last several decades, the sassi program remains. Discuss also structure soil structure interaction effects.
Sassi fe program for seismic response analysis of nuclear. Complex response analysis of soilstructures systems by the finite element method. Soilstructure interaction analysis of pile foundations. Soilstructure interaction analysis is often preceded by siteresponse analysis, in order to calculate the foundation input ground motion. Practical seismic design considering nonlinear soilpile.
Complex response analysis of soil structures systems by the finite element method. The earthquake engineering online archive nisee elibrary. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces impacting structure by the definition of seismic excitation. Seismic soil structure interaction analysis creators. 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. 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. 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. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. 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. 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. 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. This paper introduces a new alternative for soilpilestructure interaction analysis, based on established soilpile interaction theory, which accommodates a wide range of foundation conditions.
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