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