The program has been developed specifically for practical applications and has the following characteristics. Inertial interaction springs used to represent soil foundation interaction. Analysis of seismic soilstructure interaction for a. 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. Acs sassi is a software suite that simulates the soil structure interaction of building during an earthquake. Soil structure interaction of multistoried building with and without infill wall. After more than a quarter century of consulting engineering work, i have come to the conclusion that our project engineers need robust software. Sassi, seismic, soil structure interaction, in structure response spectra. Soilstructure interaction for building structures nist. Effect of interactions on dynamic active earth pressures m. 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. Soil structure interaction broadly can be divided into two phenomena. The system for analysis of soil structure interaction sassi lysmer et al.
System for analysis of soilstructure interaction sassi verification. Epri report 1015111 program on technology innovation. Pdf linear and nonlinear soilstructure interaction. Pushover analysis of nuclear power plant in atena software. 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 results are used for both the structural design and the seismic qualification of components, equipments, and systems. Crm content rights management, contentsaware networks fruition and. These programs enabled large ssi models with over 55,000 interaction nodes to be analyzed using the direct method in mtr sassi for the first time. Originally developed by a team at the university of. Sassi is a computer code for performing finite element analyses of soilstructure interaction to evaluate the effect of seismic ground motion on structures. Guidance on the use of the system for analysis of soil. This offers several advantages over other finite element programs in which the total ssi system is solved in one step.
Modeling of dynamic soil structure interaction in the threedimensional finite element analysis of buildings horst werkle1 and jadranko volarevic2 abstract in the earthquake analysis of threedimensional finite element models of buildings consisting of shell elements, soil structure interaction may significantly influence the structural response. Our experience is in substructual engineering, geotechnic al engineering and higher level computer languages. The desired soil springs were those of low frequencies for the analysis. Sc solutions proprietary soil structure interaction ssi analysis tool, scsassi. This report presents engineering application guidelines for conducting seismic soil structure interaction ssi analyses of nuclear power plant structures. Site response analysis, impedance analysis, and formation of the basic stiffness and mass matrices for the structure. In the eld of soilbuilding interaction acs sassi is currently the leading software package from ghiocel predictive technologies inc. The objective of this final phase is to demonstrate that classi and sassi. The acs sassi software is an extremely user friendly, modern engineering software. This channel shows several simulation using acs sassi. This offers several advantages over other finite element programs. The general guide lines for using the incoherency option are described at the end. Soil structure interaction and seismic design code provision even though the soil has good engineering characteristics 3.
At the local scale, soil carbon sequestration has cobenefits with agriculture and is. The soil mechanical model must allow representing the correct behavior of soil under the structure static loads accounting for the interaction effects due to neighboring buildings. Seismic soil structure interaction for design and assessment of nuclear installations. 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. Overview of soil structure interaction principles jonathan p. 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.
Sassi fe program for seismic response analysis of nuclear. Sep, 2012 soil structure interaction ssi analysis evaluates the collective response of three linked systems. The earthquake engineering online archive nisee elibrary. Soil structure interaction for building structures prepared for u. Problems associated with practical application of ssi for building structures are rooted in a poor understanding of fundamental ssi principles. 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. Guidance on the use of the system for analysis of soilstructure interaction sassi on august 20, 2015, the chief of nuclear safety issued a guidance memorandum to all em field offices. A system for analysis of soilstructure interaction. Full modeling of soil, foundation, structure propagate waves through system. 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. Introduction given recent progress, the importance of soil structure interaction, or soil pile structure interaction. Does anybody know a good software for modelling soil. The hyperlinks below, present the concepts and techniques associated with modeling soil structure interaction. 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.
An advanced computational software for 3d dynamic analysis including soil structure interaction show. The software can run simultaneously up to tens or hundreds of dynamic load cases for a small runtime increase. 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. 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 in. Mansour tabatabaiea soilstructure interaction ssi analysis plays an important role in the seismic evaluation of nuclear power plants npps.
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. The modular structure of mtr sassi is specifically designed for practical applications with the following characteristics. 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. Elastodynamic soil structure interaction analysis sassi 10 was used to generate soil springs at the centerlines of the tunnels. Soilfoundation interaction analysis in easyssi youtube. Sassi is the system for analysis of soilstructure interaction, a computer code. A simple threedimensional soilstructure interaction ssi model is proposed. Early history of soilstructure interaction sciencedirect. A system for analysis of soil structure interaction university of california, berkeley. This model should allow an accurate representation of the soil structure interaction.
Combining incoherency and sssi effects has raised questions about whether the implementation of incoherency effects in the popular system for analysis of soil structure interaction sassi software. Mtr continues to innovate and advance the capabilities of mtr sassi in order to meet the everevolving needs of the industry. The sassi system for analysis for soilstructure interaction computer. A system for analysis of soil structure interaction john lysmer, mansour tabatabaieraissi, freddie tajirian, shahriar vahdani, farhang ostadan department of civil engineering, 1981 sassi computer program 54 pages. 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. Seismic analyses and design of foundation soil structure.
Spra that utilizes nonlinear soilstructure interaction nlssi analysis. The acs sassi software allows analysis of soilstructure interaction models with up to 650,000 nodes or 2,500,000 degrees of freedom. It was first developed at the university of californiaberkeley in 1981. In the present paper, a finite element fe model with transmitting. Sassi is the system for analysis of soilstructure interaction, a computer code for performing finite element analyses of soilstructure interaction during seismic ground motions. Applicaiton of the computer program sassi for seismic ssi. Recent advances in seismic soilstructure interaction. In that model, the layered soil medium is divided into thin layers and each thin layer is represented by a parametric model.
Soilstructure interaction livermore software technology corp. Mtrsassi software is a substructuring program that uses the complex. Seismic soil structure interaction analysis creators. If this situation is faced, rigorous treatment of soil structure interaction requires that the effective foundation input motion be calculated, an additional step in the design. The system for analysis of soil structure interaction sassi is the most widely used code for ssi analysis in the nuclear industry. Integral bridge analysis using soil structure interaction. Nicola masini francesco soldovieri editors from artifact to historical.
Practical seismic design considering nonlinear soilpile. However, nonlinear ssi analysis including soil and structure. One modeling feature useful to soil structure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Mtrsassi software is a substructuring program that uses the complex frequency response method and finite element technique to solve a wide range of dynamic. A description of the theoretical formulation and its implementation into the prevalent sassi software. A system for analysis of soilstructure interaction university of california, berkeley. Site response analysis, subgrade impedance analysis, and formation of the basic stiffness and mass matrices for the structure can be performed separately. Ammar motorwala modelling soil structure interaction for nonlinear dynamic analysis of framed structures with pile foundation 1 p a g e modelling soil structure 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 over time at.
Soil structure interaction analysis using acssassi. Soil structure interaction ssi analysis in the nuclear industry is currently performed using linear codes that function in the frequency domain. System for analysis of soilstructure interaction sassi. 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. The report further illustrate the resonance vibration of building and variation in nature of design. Soil structure interaction response to high amplitude forced vibration d. Engineering tools ghiocel predictive technologies, inc. The vertical and horizontal soil springs are linear elastic, however, the soil tunnelslippage interaction. Nuclear standard plant seismic response animation youtube. The response of nuclear power plants npps to seismic events is affected by soil structure interactions ssi. Soil structure interaction ssi analysis is key to calculating the seismic demands on nuclear structures, systems and components sscs. Welcome to soilstructure software tm soilstructure software. Site response analysis, impedance analysis, and formation of the basic stiffness and mass matrices for the structure can be performed separately. Linear and nonlinear soilstructure interaction analysis.
Soil structure interaction analysis is often preceded by siteresponse analysis, in order to calculate the foundation input ground motion. Soilstructure interaction is an interdisciplinary field of endeavor which lies at the intersection of soil and structural mechanics, soil and structural dynamics, earthquake engineering, geophysics and geomechanics, material science, computational and numerical methods, and diverse other technical disciplines. By way of illustration, a piece of seismic software, named seismosignal. Ghiocel 1, ovidiu bogdan 2 and dan cretu 3 abstract the paper presents selected results of an international project of the new research center in. Sc solutions provides software technical support, training, and consulting. I need to model the effect on the basic acceleration on field by the existence of near constructions. Sassi fe program for seismic response analysis of nuclear containment structures. Soilstructure software t eam is comprised of licensed engineers and graduate computer programmer. Site response analysis, subgrade impedance analysis, and formation of the basic stiffness and mass matrices for the structure.
Soil structure interaction and seismic design code provision. A description of the theoretical formulation and its implementation into the prevalent sassi software framework via sc sassi. Mansour tabatabaiea soilstructure interaction ssi analysis plays an important role in the seismic. Application of seismic ground motion incoherency effects. Department of commerce national institute of standards and technology engineering laboratory gaithersburg, md 20899 by nehrp consultants joint venture a partnership of the applied technology council and the consortium of universities for research in earthquake engineering. 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. A simple soilstructure interaction model sciencedirect. Complex response analysis of soil structures systems by the finite element method. 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.
First, a model is developed for a layered soil medium. Because our engineers are also consultants, soilstructure software is in sync with current state of practice. Soilstructure interaction analysis of pile foundations. Using ssi substructuring methods, the acs sassi software solution in complex frequency is restricted to linearized ssi analysis solutions. These programs enabled large ssi models with over 55,000 interaction nodes to be analyzed using the direct method in mtrsassi for. Sassi is a substructuring program that uses the complex frequency response method and finite element technique to solve soilstructure interaction ssi problems.
Ghiocel 1, ovidiu bogdan 2 and dan cretu 3 abstract the paper presents. Selection of excavated soil interaction nodes and element meshing dan m. Oct 03, 2011 frew is being revised to simplify analysis of integral bridges using a soil structure interaction procedure as outlined in the new highways agency publication pd66941. Timedomain soilstructure interaction analysis of nuclear. Assessment of seismic analysis methodologies for deeply. Overview of soilstructure interaction principles jonathan p. A walk through time past, present, and future oecdnea iage iaea issc workshop on soil structure interaction ssi knowledge and effect on the seismic assessment of npps structures and components ottawa, canada, 68 october 2010 sponsored by. Sassi system software configuration technical report. 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 technical knowledge base. Does anybody know a good software for modelling soil structure interaction. Distributed engineering is an authorized software reseller for acs sassi. Earthquake ground motion causes soil displacement known as freefield. The code is widely used in the nuclear industry and in the department of energy doe. Siteresponse and soil structure interaction analysis. Soil structure interaction ssi analysis has been recognized to be an essential step in the design of important structures.
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