The sassi online tutorial for registering to participate in the dsm5 research study. Sassi is widely used within doe, and across the nuclear industry, to analyze the effect of seismic ground motions on strnctures, and its outputs. New asce 4 standardbased probabilistic soilstructure interaction ssi. 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. 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. Development of acceptance criteria for soilstructure. In the structuresoilstructure interaction analysis, three generic site profile cases representing the soft, medium, and hard soil case profiles areconsidered. Applicaiton of the computer program sassi for seismic ssi. Seismic soilstructure interaction ssi analysis of nuclear power plants. Sassi fe program for seismic response analysis of nuclear containment structures mansour tabatabaiea soilstructure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. View soilstructure interaction research papers on academia. Sassi is a computer code for performing finite element analyses of soil structure interaction to evaluate the effect of seismic ground motion on structures. Soilstructure software slab on grade mat or raft foundation drilled pier shallow foundation cantilever shoring lateral foundation grade beam cantilever retaining wall tieback wall liquefaction spt settlement analysis driven pile professional software packages all 12 software package any 7 software package three software combination geotechnical analysis package deep foundation design suite. A system for analysis of soilstructure interaction university of california, berkeley.
Roessetc for a realistic soil structure interaction ssi analysis, material damping in the soils and structural materials as well as the foundation radiation damping should be considered. Soilstructure interaction tests lotung and hualien, taiwan established the validity of different methods when applied to the same model frequency domain solutions surfacefounded embedded foundations additional data on the spatial variation of motion depth in the soil responses compared within engineering accuracy. This interaction between the structure and the soil is named soilstructure interaction ssi. Sc solutions provides software technical support, training, and consulting. Ammar motorwala modelling soilstructure interaction for nonlinear dynamic analysis of framed structures with pile foundation 1 p a g e modelling soilstructure 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. Estimating total system damping for soil structure interaction systems farhang ostadan,a nan deng,b and jose m. 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. Complex response analysis of soil structures 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. The hyperlinks below, present the concepts and techniques associated with modeling soil structure interaction. Some structures where ssi is especially important are buildings, bridges and oil rigs. The code is widely used in the nuclear industry and in the department of energy doe. Sc solutions proprietary soil structure interaction ssi analysis tool, scsassi. The industrywide methodology of computing ssi response of buildings is through linear ssi techniques using the computer code sassi.
Sc solutions proprietary soil structure interaction ssi analysis tool, scsassi, is available to clients through license and can be run on the clients own hardware or on sc solutions inhouse high performance computing hpc platform. A description of the theoretical formulation and its implementation into the prevalent sassi software framework via sc. The results are used for both the structural design and the seismic qualification of components, equipments, and systems. Considering soilstructure interaction makes a structure more flexible and thus, increasing the natural period of the structure compared to the corresponding rigidly supported structure. The first one, sassi, is the industrystandard tool used today for the ssi. Soil structure interaction analysis of a deeply embedded.
For example, all nodes of the excavated soil models in the direct method are interaction nodes as shown in figure 1b. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. First, a model is developed for a layered soil medium. 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.
Soilstructure interaction large civil structures such as concrete dams, nuclear power plants, highrise buildings and bridges are massive enough that their vibration due to earthquake excitation affects the motion of the soil or rock supporting them,which in turn further affects the motion of the struc. Estimating total system damping for soil structure. The response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil. The mechanical behavior of structures that are in contact with soil is a ected by the interaction between the soil and the structure. Sassi is the system for analysis of soilstructure interaction, a computer code. Current practice of siteresponse and ssi analysis in the u. This talk will focus on three important aspects of ssi simulations for nppssss. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. Soil structure interaction analysis is often preceded by siteresponse analysis, in order to calculate the foundation input ground motion. Sassi fe program for seismic response analysis of nuclear. Groundstructure interaction ssi consists of the interaction between soil ground and a. The report further illustrate the resonance vibration of building and variation in nature of design. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of.
Welcome to soilstructure software tm soilstructure software. Soilstructure interaction research papers academia. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. The first one is the common way, using the rayleigh waves dispersion on the soil surface, and the back calculation to shear wave profiles. The second approach is the back calculation of the. Seismic soilstructure interaction ssi analysis of nuclear power plant npp. A system for analysis of soilstructure interaction. It is noted that the symbol, is used to indicate interaction nodes in these figures. Sassi is a computer code for performing finite element analyses of soilstructure interaction to evaluate the effect of seismic ground motion on structures. Soil structure interaction ssi response analysis for a traditional spra uses linear geometric properties soil and structure are glued together i.
Investigation of the seismic soilstructure interaction on a concrete instrumented building soilstructure interaction ssi effects can lead either to seismic actions lower than the free field ones, or to more conservative ones considering ssi may be essential for. Recent advances in seismic soilstructure interaction. Missouri university of science and technology scholars mine. System for analysis of soilstructure interaction sassi. Various combinations of soil and structure can either.
Recent advances in seismic soilstructure interaction analysis of. Effect of interactions on dynamic active earth pressures m. Investigation of the seismic soilstructure interaction. This interaction is termed structuresoilstructure interaction sssi, which can be important for the performance assessment of buildings, especially those constructed in dense, urban areas. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. This is especially applicable to areas of seismic activity. Soilstructure interaction ssi analysis evaluates the collective response of three linked systems. The sassi flexible volume substructuring uses an extremely ingenious substructuring approach lysmer, 1981 that makes the soil impedance calculation trivial. The sasasl is an instrument specifically developed in american sign language and validated to screen for substance use disorders among adult deaf and hard of hearing clients in vocational rehabilitation, mental health, and social service settings. The program has been developed specifically for practical applications and has the following characteristics. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structuresoilstructure. Soil structure interaction and seismic design code provision even though the soil has good engineering characteristics 3. A simple soilstructure interaction model sciencedirect. 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.
Spra that utilizes nonlinear soilstructure interaction nlssi analysis. Sassi fe program for seismic response analysis of nuclear containment structures mansour tabatabaiea soil structure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps. One modeling feature useful to soil structure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. Soilstructure interaction using computer and material models covers computer and analytical methods for a number of geotechnical problems. 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. Soil structure interaction ssi knowledge and effect on the seismic assessment of npps structures and components comparison of maximum accelerations soil analysis case 2sn4um location elev.
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. This phenomenon has played an important role in assessing. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force, load, displacements etc. Seismological considerations for the analysis of soil structure. The finite element models of the excavated soil for the various sub structure methods in the cases of h2.
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 earthquake engineering online archive nisee elibrary. Most of what we do falls under the headings of publishing, clinical consultation, research, training and customer service. Csi software models soilstructure interaction using a oneparameter winkler soil model. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and. Acs sassi is a highly specialized soilstructure interaction ssi finite element analysis software. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of responses of structures. Seismic soilstructure interaction analysis of ventilation. Does anybody know a good software for modelling soil structure interaction. Sep, 2012 soil structure interaction ssi analysis evaluates the collective response of three linked systems. To establish a firm base for the classification of the methods, the objective and the significant features of soilstructureinteraction analysis described in the two text books 33, 38 are summarized in the following.
Second, the soil often makes the system more flexible, thus decreasing the fundamental frequency to lelow that of the fixed base case. One modeling feature useful to soilstructure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. Ssi workshop 2015 scecpedia university of southern california. Sgh performs soil structure interaction ssi analyses to evaluate the true responses of these systems.
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. Finally, the radiation of enerry fran the structure into the soil increases the damping of final system. Soil structure interaction response to high amplitude forced vibration d. To address this problem, a finite element method is used to model soil structure interaction analysis of raft foundation supported framed structures by programming in sap 2000 v14 software. I need to model the effect on the basic acceleration on field by the existence of near constructions. A simple threedimensional soilstructure interaction ssi model is proposed. Soilstructure interaction for building structures nist. Seismic analysis and design of highhazard nuclear facilities requires evaluation of soilstructure interaction ssi effects on structure and soil response due to earthquake ground motions.
The acs sassi software is an extremely user friendly, modern engineering software under ms windows with a unique suite of ssi engineering capabilities. Soilstructure interaction technical knowledge base. Problems associated with practical application of ssi for building structures are rooted in a poor understanding of fundamental ssi principles. The software is a userfriendly finite element computer code on. Assessment of the soilstructure interaction based on. Mar 01, 2018 soil foundation interaction analysis and obtaining impedance functions using truncated cone model developed by meek, veletsos and wolf since 1990s. The soilstructure system is referred to a global x 1 x 2 x 3 coordinate system as shown in the figure, where x 1 x 2 coincides with the top surface of the layer and x 3 axis is directed upwards. The acs sassi software uses the flexible volume substructuring fvs in complex.
Sassi system software configuration technical report. Distributed engineering is an authorized software reseller for acs sassi. Seismic soil structure interaction analysis creators. Over the past 30 years, the program sassi has evolved. Department of energy doe deputy secretary a letter discussing technical and software quality assurance concerns with the computer program, system for analysis of soil strncture interaction sass. The dynamic effect of the soil structure interaction is clear. This interaction between the structure and the soil is named soil structure interaction ssi.
System for analysis of soilstructure interaction sassi verification. Sgh performs soilstructure interaction ssi analyses to evaluate the true responses of these systems. As i know directly from john lysmer lysmer, 1990, it should be noted that the original idea of the flexible volume substructuring for seismic ssi analysis came from joseph penzien. Soilstructure interaction livermore software technology corp. Scec workshop on soilstructure interaction of complex systems. Does anybody know a good software for modelling soil. 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. Engineering tools ghiocel predictive technologies, inc. 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 of ventilation stack structure. 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 soilstructure interaction problems. The finite element models of the excavated soil for the various substructure methods in the cases of h2.
When external forces, such as earthquakes, act on these systems, neither structural displacements nor ground displacements are independent of each other. Evaluation of structuresoilstructure interactionsssi. Soil structure interaction and seismic design code provision. Soilstructure interaction livermore software technology. The dynamic properties of the soil can be determined in two different ways. It was first developed at the university of californiaberkeley in 1981. 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 phenomenon in which the response of soil and movement of the structure influence each other.
Both coherent and incoherent motions were considered. The sassi institute was formed in 1988 with the publication of the first substance abuse subtle screening inventory sassi. In that model, the layered soil medium is divided into thin layers and each thin layer is represented by a parametric model. The program has been developed specifically for practical. The second approach is the back calculation of the soil stiffness, based on the soil structure interaction. Soilfoundation interaction analysis in easyssi youtube. 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 is an area of major importance in geotechnical engineering and geomechanics advanced geotechnical engineering. The hyperlinks below, present the concepts and techniques associated with modeling soilstructure interaction. Acs sassi is a highly specialized soil structure interaction ssi finite element analysis software.
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