Recent advances in seismic soilstructure interaction. The response of nuclear power plants npps to seismic events is affected by soil structure interactions ssi. This paper introduces a new alternative for soilpilestructure interaction analysis, based on established soilpile interaction theory, which accommodates a wide range of foundation conditions. Soilstructure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. Analysis of seismic soilstructure interaction for a nuclear. Complex response analysis of soilstructures systems by the finite element method. Soil structure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. The soilstructure interaction analyses were performed for both coherent synchronous and incoherent non. 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. Current practice of siteresponse and ssi analysis in the u. Seismic soilstructure interaction analysis creators. This is especially applicable to areas of seismic activity. Analysis of seismic soilstructure interaction for a. Acs sassi is a highly specialized soil structure interaction ssi finite element analysis software.
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. Sassi is a computer code for performing finite element analyses of soilstructure interaction to evaluate the effect of seismic ground motion on structures. 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 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. Sc solutions proprietary soil structure interaction ssi analysis tool, scsassi. The sassi system for analysis for soilstructure interaction computer. Soilstructure interaction ssi analysis is a special field of earthquake engineering.
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 software suite that simulates the soil structure interaction of building during an earthquake. Sassi system software configuration technical report. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. A system for analysis of soilstructure interaction.
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. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and. Seismic soilstructure interaction ssi analysis of nuclear power plants. Soilstructure interaction certified training institute. The structure is typical for romania and highly used throughout the country. 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 program has been developed specifically for practical applications and has the following characteristics. 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. 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. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of. The computer program sassi 1999 is widely used for seismic soilstructure interaction ssi analysis of nuclear structures.
Engineering tools ghiocel predictive technologies, inc. It was first developed at the university of californiaberkeley in 1981. Doe forwards the report, system for analysis of soil structure interaction sassi software quality assurance practices document. 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.
The seismic soilstructure interaction were performed using the stateoftheart acs sassi software. Sassi fe program for seismic response analysis of nuclear. Does anybody know a good software for modelling soil structure interaction. The response of the ground and nearby structures to tunnelling constitutes a complex soilstructure interaction boundary value problem. Geotechnique papers published over the past 60 years that. Sassi system software configuration technical report osti. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of responses of structures. Sassi is widely used within doe, and across the nuclear industry, to analyze the effect of seismic ground motions on strnctures, 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 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 has been recognized to be an essential step in the design of important structures. The program offers two main substructuring methods. This project stems in part from our commitments to address sassi technical and software quality assurance issues that were made to the.
Paper open access soilstructure interaction and motion. An advanced computational software for 3d dynamic analysis including soilstructure interaction show more show less uploads play all. These methods are the basis for computation of the impedance matrix as. 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. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure. Sgh performs soilstructure interaction ssi analyses to evaluate the true responses of these systems. The acs sassi software uses the flexible volume substructuring fvs in complex. By way of illustration, a piece of seismic software, named seismosignal. Npps in the united states is often performed in the frequency domain using sassi. The results are used for both the structural design and the seismic qualification of components, equipments, and systems. Both coherent and incoherent motions were considered.
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 response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil. Analysis parameters that affect the accuracy of the calculations, including the. The software is a userfriendly finite element computer code on.
Linear and nonlinear soilstructure interaction analysis 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. The acs sassi software is an extremely user friendly, modern engineering software under ms windows with a unique suite of ssi engineering capabilities. Sc solutions provides software technical support, training, and consulting. 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. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. The earthquake engineering online archive nisee elibrary. 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. Earthquake ground motion causes soil displacement known as freefield. Iaea tecdoc on seismic soil structure interaction for. A system for analysis of soilstructure interaction university of california, berkeley.
Ostadan f, nan d 2012 sassi 2010 a system for analysis of soilstructure interaction. Acs sassi acs sassi is a highly specialized soilstructure. Mar 01, 2018 soil foundation interaction analysis and obtaining impedance functions using truncated cone model developed by meek, veletsos and wolf since 1990s. Soilstructure interaction analysis of pile foundations. Pdf seismic structure soilstructure interaction sssi. New asce 4 standardbased probabilistic soilstructure interaction ssi. System for analysis of soilstructure interaction sassi. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces impacting structure by the definition of seismic excitation. Iaea tecdoc on seismic soil structure interaction for design. 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. I need to model the effect on the basic acceleration on field by the existence of near constructions. Seismic structure soilstructure interaction sssi effects. Structuretostructure interaction foundation with pile groups and battered piles. Practical seismic design considering nonlinear soilpile.
Soil structure interaction broadly can be divided into two phenomena. Mtrsassi software is a substructuring program that uses the complex frequency response method and finite element technique to solve a wide range of dynamic. Spra that utilizes nonlinear soilstructure interaction nlssi analysis. Sgh performs soil structure interaction ssi analyses to evaluate the true responses of these systems. 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. Sassi is a computer code for performing finite element analyses of soil structure interaction to evaluate the effect of seismic ground motion on structures. Does anybody know a good software for modelling soil. Soil structure interaction analysis using acssassi.
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. Common sense tells us that every seismic structural response is caused by soil structure interaction forces impacting structure by the definition of seismic excitation. Soilstructure interaction analysis is often preceded by siteresponse analysis, in order to calculate the foundation input ground motion. Seismic analyses and design of foundation soil structure. 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. The program has been developed specifically for practical. Soilfoundation interaction analysis in easyssi youtube. How can i model soil structure interaction using spring method in abaqus. Doe forwards the report, system for analysis of soil. Complex response analysis of soil structures systems by the finite element method. Acs sassi is a highly specialized soilstructure interaction ssi finite element analysis software. Linear and nonlinear soilstructure interaction analysis.
Various combinations of soil and structure can either. Soilstructure interaction and motion incoherency effects. 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. Sassi is the system for analysis of soilstructure interaction, a computer code. 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. The code is widely used in the nuclear industry and in the department of energy doe. Recent advances in seismic soilstructure interaction analysis of. Seismic soil structure interaction analysis creators. 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. Epri report 1015111 program on technology innovation. A method for converting the ansys and lsdyna finite.
Mtrsassi software is a substructuring program that uses the complex. The site is modelled as a series of horizontal layers overlying a. Soil structure interaction ssi analysis is a special field of earthquake engineering. Gpt inc is a program which performs seismic soil structure interaction 551 analysis. Sassi is widely used within doe, and across the nuclear industry, to analyze the effect of seismic ground motions on structures, and its outputs. The response of nuclear power plants npps to seismic events is affected by soilstructure interactions ssi.
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