Medium dense sand spt n 20 density 120 pcf friction angle 33 o gravity load allowables 4000 psf, b 2000 psf, b 40 ft bearing capacity eq 2000. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of. Soilstructure interaction using computer and material models covers computer and analytical methods for a number of geotechnical problems. Spra that utilizes nonlinear soilstructure interaction nlssi analysis. Pdf fullscale modeling of the soilstructure interaction problem. Soilstructure interaction certified training institute. Note that gap objects exhibit nonlinear behavior, and therefore require a nonlinear load case during analysis.
Structural software for analysis and design sap2000. Soil structure interaction ssi analysis is a special field of earthquake engineering. Soilstructure interaction ssi analysis evaluates the collective response of three. Both the soil structure system and the structure model alone are subjected to identical base excitations via a benchscale shaking table. I am modelling a tunnel structure rectangular using soil structure interaction in sap2000. Soilstructure interaction ssi analysis is a special field of earthquake engineering. The interactions between soil biota, soil structure, and. Jobbagy and jackson 2000 depth global soc stock pg 01 m 1,3001,600 12 m 500 23 m 350 below 40 cm 50% below 20 cm 80% permafrost below 30 cm 800. Sap2000, integrated software for structural analysis and design computers and. A simple soil model will be constructed and connected in series with a 1d structure model. The earthquake wavesoilstructure interaction analysis of tall buildings is the main focus of this research. This book describes how a number of different methods of analysis and modelling, including the boundary element method, the finite element method, and a range of classical methods, are used to answer some of the questions associated with soilstructure interaction.
Soilstructure interaction livermore software technology. Multiple enhancements have been made for concrete frame design using indian code is 456 2000 for handling slenderness and pdelta effects. 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. Csi software models soilstructure interaction using a oneparameter winkler soil model. It introduces the main factors important to the application of computer methods and constitutive models with emphasis. This is especially applicable to areas of seismic activity. Sassi is the system for analysis of soilstructure interaction, a computer code for performing finite element analyses of soilstructure interaction during seismic ground motions. Apr 26, 2015 sap2000 tutorials training videos, manuals and model files 38 gb analysis and design of 11 storey building using sap2000, etabs, csicol, excel analysis and design of a building in sap2000 spanish analysis of frame structure using sap2000 beams modeling bridge design course with sap2000 building foundation modelling using sap2000. 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 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. Corresponding author, university of bologna, italy amorosi a. Various combinations of soil and structure can either.
Spatial frame with beams and columns and global coordinate system of 30 cm x 30 cm fig. The earthquake wave soil structure interaction analysis of tall buildings is the main focus of this research. Home software manuals sap2000 abilities for soil structure. Comparison of structural elements response in plaxis 3d and. Multiple enhancements made for chinese 2002 steel frame design. This book describes how a number of different methods of analysis and modelling, including the boundary element method, the finite element method, and a range of classical methods, are used to answer some of the questions associated with soil structure interaction. Soilstructure interaction for building structures nehrp.
What is the best representation of soil on sap2000 to. 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. Soilstructure interaction is an area of major importance in geotechnical engineering and geomechanics advanced geotechnical engineering. Impact of soil structure interaction on the seismic design of. Simplified conceptual equation for soilstructure interaction for. Which model is better for soil structure interaction in sap 2000 jointsprings or link element. 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. Dynamic soilstructure interaction, volume 83 1st edition. This study is undertaken with the objective of checking the comptability of results obtained for the design of basic structural elements of reinforced cement concrete rcc using popularly used software staad pro. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. Sassi is widely used within doe and the commercial nuclear industry to analyze the effect of. Mar 27, 2019 the modeling of lateral soil support proceeds as follows. There are two methods available for modeling the soilstructure interaction ssi. Flush a computer program for approximate 3d analysis of.
Limitations of winkler model a number of studies in the area of soil structure interaction have been conducted on the basis of winkler hypothesis for its simplicity. Hi dears i want to model soil with solid elements in sap2000, i am confused ponder in my model i have a rigid block on layerd halfspace how to connect the so soilstructure interaction in sap2000 computers and structures. The starting point for this work was decades of available soil structure interaction research, and recently published engineering guidance for static analysis procedures. The sassi 2000 module adds capability to export the sap2000 structural model to sassi system for analysis of soilstructure interaction where soilstructure interaction analysis is. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces im pacting structure by the definition of seismic excitation. Sap2000, etabs, and safe analysis reference, containing. Chapter 1 welcome to sap2000 program levels and features 1 3. Csi analysis reference manual for sap2000, etabs, safe.
A new frequency domain method for evaluating the earthquake input energy to a structurepile system or a superstructure alone subjected to horizontal ground motion was developed by takewaki et al. Both the soilstructure system and the structure model alone are subjected to identical base excitations via a benchscale shaking table. Sgh performs soilstructure interaction ssi analyses to evaluate the true responses of these 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.
The starting point for this work was decades of available soilstructure interaction research, and recently published engineering guidance for static analysis procedures. Pdf modeling of soilstructure interaction as finite element using. Integral bridge design soilstructure interaction at abutments. The experiment serves as an introduction to the modeling of soil structure systems and. Soilstructure interaction, pushover analysis, finite element analysis, crack propagation. 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. Downloads code sap2000 abilities for soilstructure interaction arabic. Seismic design of buildings worked examples worked examples presented at the workshop ec 8. A system for analysis of soilstructure interaction university of california, berkeley. Monther retaining wall modelling in sap2000 ribbed slab design in sap2000 sap 2000 continuous concrete beam analysis and design to aci 318 sap2000 2d truss sap2000 3d truss. We aim to close the gap to the industry by improving the awareness about latest trends in civil engineering.
Comparison of structural elements response in plaxis 3d. Sap2000 follows in the same tradition featuring a very sophisticated, intuitive and versatile user interface powered by an unmatched analysis engine and design tools for engineers working on transportation, industrial, public works, sports, and other facilities. 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. Dynamic soil structure interaction geoslope international. Influence of biota on soil structure and som cyclingstabilisierung organischer substanz im boden on different scales. Feb 29, 2012 the natural eigen frequency of the soil layer without footing which is 18. In that model, the layered soil medium is divided into thin layers and each thin layer is represented by a parametric model. Additional information can be found in the online help facility available. Sap2000 abilities for soil structure interaction arabic. The direct method is used for modeling the soil and a tall building together.
Soil structure interaction ssi analysis is similar kind of problem where all the. It was first developed at the university of californiaberkeley in 1981. On the contrary, a foundation plinth 1 m high and characterised by a square section 1 m x 1 m was assumed at the base of each column in the plaxis 3d analysis, modelled by a twodimensional. One modeling feature useful to soil structure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. The program has been developed specifically for practical applications and has the following characteristics. A simple soilstructure interaction model sciencedirect. Interaction with stress analysis currently under testing, not available in initial release. A simple threedimensional soilstructure interaction ssi model is proposed. Soilstructure interaction livermore software technology corp. Soilstructure interaction technical knowledge base computers.
The sassi 2000 module adds capability to export the sap2000 structural model to sassi system for analysis of soilstructure interaction where soilstructure interaction analysis is performed and then import sassi results. The sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. Foundation analysis and desing foundation design 1. Modeling of soil in sap2000 for use in soil structure interaction. In recent years centrifuge tests have been used to guide the development. It has been asserted in literature that the understanding of the software used today is the urgent necessity of the moment in order to match the pace of infrastructural development. Im trying to model soil structure interaction on sap2000 im using george gazetas rules to replace the soil and foundation with a springs to represent how to model soil structure interaction on etabs,sap2000 computers and structures. Eurocode 32005 steel frame design has been enhanced to provide more detailed reporting.
Seismic considerations in design of offshore wind turbines. Earthquake recordings from a model test structure located at garner valley california are used to evaluate inertial soilstructure interaction ssi effects. To examine the performance of the model under cyclic. Modeling of soilstructure interaction as finite element. Therefore, and because of the importance of the soil structure interaction, this paper. Sap2000 v10 page 1 sap2000 v10statics, dynamics and earthquake engineeringfinite element analysis and design software for structuresand bridges tel. Stated conversely, the presence of a stiff structure could possibly affect the response of the ground to earthquake shaking. Multiple enhancements made for chinese 2002 concrete frame design. It influences the behavior of soil, as well as the response of pile under loading. Which model is better for soilstructure interaction in. The fundamental problem with the use of this model is to determine the stiffness of elastic springs used to replace the soil below foundation. 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. Soilstructure and interaction ssi analysis is similar kind of problem where all the. The response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil.
Sap2000 abilities for soilstructure interaction civil. Im trying to model soil structure interaction on sap2000 im using george gazetas rules to replace the soil and foundation with a springs to represent how to model soil structure interaction on etabs, sap2000 computers and structures. Software manual, institute of structural analysis and. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force, load, displacements etc. 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 problems. Dear all, i am modelling a tunnel structure rectangular using soilstructure interaction in sap2000. Multiple enhancements made for indian concrete frame design per code is 456 2000. Sap2000 tutorials training videos, manuals and model files. Jun 23, 2016 soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. It is strongly recommended that you read this manual and work the tutorial before attempting a real project using sap2000. Which model is better for soilstructure interaction in sap.
The manuals are available in adobe acrobat pdf format on the sap2000 cd, and can also be accessed from within the program using the help menu. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and. Which model is better for soilstructure interaction in sap 2000 jointsprings or link element. Earthquake wavesoilstructure interaction analysis of tall. It is determined by how individual soil granules clump, bind together, and aggregate, resulting in the arrangement of soil pores between them. The procedure considers the nonlinear behaviour of soils.
Soilstructure interaction technical knowledge base. Earthquake wavesoilstructure interaction analysis of. Keywords soilstructure interaction laterally loaded pile finite element analysis introduction the pile foundations are adopted to transfer the load from the structure to soil when the structure is embedded in a weak. There are two methods available for modeling the soil structure interaction ssi. The test structure consists of steel columns and bracings 4. For nongapping soil behavior, draw one link per joint figure 1, and for gapping soil behavior, draw two links per joint, one on each side figure 2. The dynamic effect of the soil structure interaction is clear.
I am working on a soil structure interaction problem. Soil structure interaction in sap2000 computers and structures. Soil structure interaction, seismic design, reinforced concrete buildings. 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. Software tools are nowadays become very important and essential for the structural problems where a lack of wellestablished methods is available for analysis. Define links, and their associated properties, which will represent lateral support from the soil. A system for analysis of soilstructure interaction. Portico design in sap2000 raft and soilstructure interaction rectangular water tank analysis in sap2000 retaining wall ananysis and design in sap2000 by dr. Sap2000 csi, 2007 with the following varying parameters. Soil structure interaction at a finite distance from a structure, the absolute displacements must approach the freefield displacements 16. Soil structure describes the arrangement of the solid parts of the soil and of the pore space located between them. System for analysis of soilstructure interaction sassi. First, a model is developed for a layered soil medium.
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