Nonlinear seismic soil structure interaction ssi method for developing nonlinear seismic ssi analysis techniques justin coleman, p. First, a model is developed for a layered soil medium. Both the soil structure system and the structure model alone are subjected to identical base excitations via a benchscale shaking table. Sap2000 csi, 2007 with the following varying parameters. Sap 2000 is an integrated software for structural analysis and design. Divya post graduate student, associate professor, school of mechanical building and sciences, vit university, chennai, india abstract soil structure interaction is an important parameter in construction of structures where structural and geotechnical engineers are involved. Which model is better for soilstructure interaction in. Jun 12, 2017 this video describes the method of modelling of a building in sap 2000. Civilax is the knowledge base covering all disciplines in civil engineering. First the significance of soil foundation structure interaction over fixed base analysis is studied, it has been observed that the presence of soil. Inertial interaction springs used to represent soil foundation interaction complexvalued if rigid foundation, simplifies to. An overall good match was obtained, as such highlighting the possibility to use the code plaxis 3d to perform both structural and geotechnical calculations in soil structure interaction problems.
Csi software models soilstructure interaction using a oneparameter winkler soil model. The 3d model is generated in sap 2000 software package. A national soil vulnerabilitybased framework for provision of farmspecific guidance on the management of soil structure carried out by the soil survey. The fundamental problem with the use of this model is to determine the stiffness of elastic springs used to replace the soil below foundation. 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. Effect of soilstructure interaction on regular and. The details of building frame are given in table no 2.
Soil structure interaction under semi static loads in an integral abutment bridge. 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. Introduction due to rapid urbanization and increase in population one has compelled to build structures on all available types of soils. The combined behavior of the soil and structure can be known from detailed soil structure interaction ssi analysis. In this paper the response of a number of structural models subjected to different loading conditions is analysed with the codes plaxis 3d and sap2000. An attempt has been made to evaluate the effect of soil structure interaction on building with mass irregularity by considering the systematic parameters like time period, base shear, lateral displacement, storey drift. Define links, and their associated properties, which will represent lateral support from the soil. Structural software for analysis and design sap2000. The soil structure interaction analysis results of the hypothetical waste handling facility reported herein showed significant influence of the geologic profiles of the foundation medium and their geotechnical and dynamic properties on the seismic structural response of the facility. Dynamic analysis of turbo generator founadtion using sap.
Soil structure interaction ssi analysis is similar kind of problem where all the. Dynamic analysis of soil structure interaction effect on. One modeling feature useful to soilstructure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. Damage is also caused by working soil when it is either too that the structure has been eunit. Deployment of the geosynthetic reinforced soil integrated bridge system from 2011 to 2017, synthesis. Modeling of soil in sap2000 for use in soil structure interaction. Raft and soil structure interaction rectangular water tank analysis in sap2000 retaining wall ananysis and design in sap2000 by dr. Soilstructure interaction effects on seismic behaviour of reinforced. The terms soil structure interaction ssi and soil foundation structure interaction sfsi are both used to describe this effect 6. Note that gap objects exhibit nonlinear behavior, and therefore require a nonlinear load case during analysis. I am working on a soil structure interaction problem. The soil structure 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.
Numerical analysis of pilesoil interaction under axial. 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. In this study, sap 2000 were used by the researchers for the analysis purpose. Pdf modeling of soilstructure interaction as finite. Based on the results of the analytical and experimental studies, recommendations have been made to include the soil structure interaction effect for dynamic response calculations. Sap2000 training collection civil engineering community. 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. 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. Effect of soil structure interaction in seismic loads of. Users manual for laterally loaded pile analysis program for the microcomputer, com624p version 2. Which model is better for soilstructure interaction in sap 2000 jointsprings or link. 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. A major cause of damage is driving heavy equipment over wet soil.
Accepted 3 march 2000 the role of soil structure interaction ssi in the seismic response of structures is reex plored using recorded motions and theoretical considerations. The sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. The soil structure interaction in general has been a concern. Nguyenetal 15 studied the fifteen storied building for soil structure interaction on a shallow foundation. It is strongly recommended that you read this manual and work the tutorial before attempting a real project using sap2000.
Soil structure interaction in sap2000 computers and. The modeling of lateral soil support proceeds as follows. There are two methods available for modeling the soil structure interaction ssi. Mar 03, 2018 please subscribe our channel on youtube session 15 slides. Pdf fullscale modeling of the soilstructure interaction problem. I am working on soil structure interaction in my thesis i modeled rc buildings frame 5,10,15,20 storeys i want to include the effect of ssi using sap2000 first i assumed that the base of structures is fixed and use the response spectrum analysis you can include the ss and s1 and also you can choose the soil. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. Soilstructure interaction is an area of major importance in geotechnical engineering and geomechanics advanced geotechnical engineering. Study of soil structure interaction effect on multistory. Two model 2d rc frames with 7 and 12 story are selected for analysis. Sap2000 abilities for soilstructure interaction civil. Corresponding author, university of bologna, italy amorosi a. Index terms soil structure interaction, winkler model, elastic continuum and finite element method.
The starting point for this work was decades of available soilstructure interaction research, and recently published engineering guidance for static analysis procedures. Spatial frame with beams and columns and global coordinate system of 30 cm x 30 cm fig. Software tools are nowadays become very important and essential for the structural problems where a lack of wellestablished methods is available for analysis. Comparison of structural elements response in plaxis 3d and. Three dimensional finite element modeling of seismic soil. Impact of soil structure interaction on the seismic design of. A simple soilstructure interaction model sciencedirect.
Introduction 1 in the era of fast growing urbanization due to paucity of land, structure are being constructed on available. I would like to know if there are any software packages except flac with clear manual examples of how to simulate soil liquefaction. A simple soil model will be constructed and connected in series with a 1d structure model. 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. Which model is better for soil structure interaction in sap 2000 jointsprings or link element.
It introduces the main factors important to the application of. Which model is better for soilstructure interaction in sap 2000 jointsprings or link element. Sap model of cantilever retaining wall embedded in. Seismic design of buildings worked examples worked examples presented at the workshop ec 8. Effects of soil structure interaction on behavior of. A single bay five storey framed structure with a pile group foundation is modeled. A simple threedimensional soilstructure interaction ssi model is proposed. Soil structure interaction, seismic response, response spectrum, raft footing, finite element method, elastic continuum, winkler method, sap 2000. The soil structure interact ion has been found to be significantly affecting the performance of structure and it is discussed in this paper. Plaxis comparison of structural elements response in. Seismic performance of a typical existing core frame rc.
Windows 2000, windows nt, windows xp the sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. Additional information can be found in the online help facility available. 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. Dynamic analysis of single cylinder compressor block. Effects of soil structure interaction on behavior of reinforced concrete structures 32 fig. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. Dear all, i am modelling a tunnel structure rectangular using soil structure interaction in sap2000. Dear all, i am modelling a tunnel structure rectangular using soilstructure interaction in sap2000. Journal of earthquake engineering seismic soilstructure. Winkler spring and half space direct method models are used for flexible base for the frames founded on two types of soft soils. Introduction the computational model of a beam or a plate on an elastic foundation is often used to describe a lot of engineering problems and has application in geotechnics, road, railroad and. For the love of physics walter lewin may 16, 2011 duration. Soil structure interaction analysis on a rc building with.
I am modelling a tunnel structure rectangular using soil structure interaction in sap2000. We aim to close the gap to the industry by improving the awareness about latest trends in civil engineering. Sap2000 tutorials training videos, manuals and model files. 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 primary purpose of using piles is to transfer the loads from the superstructure and the abutment to a reliable soil, in cases where the soil near the ground surface can. Ramya and saikumar 14 also compared these software and concluded that area of steel required by using etabs was less. Wolf 1979 soil bearing mentioned that the use of piling for. Soil structure interaction is a collection of phenomena in the response of structures caused by the flexibility of the foundation soils, as well as the response of soils caused by the presence of structures. The dynamic effect of the soil structure interaction is clear. Both inertial and kinematic soil structure interaction ssi effects can contribute to the response of a structure resting on a compliant geologic medium. Pdf modeling of soilstructure interaction as finite element using.
Which model is better for soilstructure interaction in sap. 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 sap2000 building modelling example. Soil structure interaction case study of a skyscraper in brazil. Soil structure damage soil structure can be destroyed. Home software manuals sap2000 abilities for soil structure. Earthquake wavesoilstructure interaction analysis of tall. Soil structure interaction, seismic design, reinforced concrete buildings. Jun 30, 2015 civilax is the knowledge base covering all disciplines in civil engineering. Firstly, the way current seismic provisions treat ssi effects is briefly discussed. 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. The hyperlinks below, present the concepts and techniques associated with modeling soilstructure interaction. Sap2000 v10 page 1 sap2000 v10statics, dynamics and earthquake engineeringfinite element analysis and design software for structuresand bridges tel.
The analysis is highly essential for predicting a more accurate structural behavior so as to improve the safety of structures under extreme loading conditions. An investigation of the natural microscale mechanisms that cause volume change in expansive clays. Sassi2000 theoretical manual download sassi2000 manual. Jun 23, 2016 soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. The manuals are available in adobe acrobat pdf format on the sap2000 cd, and can also be accessed from within. This paper investigates effects of site response and dynamic soilstructure interaction on performance of linear elastic structures supported by inelastic soft soil. How to model a soilstructure interaction for a pile using nonlinear. Download mercury 50hp classic fifty 2 stroke manual. Local procedures in section 3 are grouped as transmitting boundary conditions, infinite elements and absorbing layers. It influences the behavior of soil, as well as the response of pile under loading.
The sap name has been synonymous with stateoftheart analytical solutions. The slab and mat foundations are modelled as a rigid diaphragm with the help of four node plate elements. Csi analysis reference manual for sap2000, etabs, safe. For this purpose, a three dimensional finite element model utilizing kinematic hardening elastoplastic soil model and linear sdof structure. A guide to better soil structure is based on maff funded project. One modeling feature useful to soil structure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. In that model, the layered soil medium is divided into thin layers and each thin layer is represented by a parametric model. The direct method is used for modeling the soil and a tall building together. The term freefield refers to motions that are not affected. Inertial interaction springs used to represent soilfoundation interaction complexvalued if rigid foundation, simplifies to. Longitudinal reinforcement ratios of columns 0 700 1400 2100 2800 n numbers of the column rigid soil structure model winkler model vlasov model 0 200 400.
Study on soil structure interface properties yalala nisha, dr. Soil structure interaction using springs on sap2000 stressed civilenvironmental 25 jul 15 15. What is the best representation of soil on sap2000 to. Army corps of engineers soil mechanics basic concepts and engineering applications soil mechanics and foundations muni budhu 3 ed soil mechanics and foundations, 3rd edition soil mechanics book soil mechanics by arnold verruijt.
Advanced seismic soil structure modeling inl digital library. The manuals are available in adobe acrobat pdf format on the sap2000 cd, and can also be. Soil structure interaction using springs on sap2000. Soilstructure interaction, pushover analysis, finite element analysis, crack propagation. Effect of soilstructure interaction in seismic analysis. Simplified conceptual equation for soilstructure interaction for. Soilstructure interaction technical knowledge base computers. Sap2000 follows in the same tradition featuring a very sophisticated, intuitive and versatile user interface powered by an unmatched analysis engine and design. Technical paper soilstructure institution of civil. 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. Soilstructure and interaction ssi analysis is similar kind of problem where all the.
Sap2000 abilities for soil structure interaction arabic. Comparison of structural elements response in plaxis 3d. Spra that utilizes nonlinear soilstructure interaction nlssi analysis. Downloads code sap2000 abilities for soilstructure interaction arabic. The seismic performance of a typical reinforced concrete frame core wall building is investigated, accounting for soil structure interaction ssi.
Chapter 1 welcome to sap2000 program levels and features 1 3. Feb 29, 2012 the natural eigen frequency of the soil layer without footing which is 18. Therefore, and because of the importance of the soil structure interaction, this paper. In past construction of structure on soft soil were considered to be unsuitable. The starting point for this work was decades of available soil structure interaction research, and recently published engineering guidance for static analysis procedures. Soilstructure interaction using computer and material models covers computer and analytical methods for a number of geotechnical problems. Purchase soil structure interaction, volume 43 1st edition.
Soil structure interaction at a finite distance from a structure, the absolute displacements must approach the freefield displacements 16. Soilstructure interaction technical knowledge base. The goal of such a comparison is the assessment of the structural elements performance in plaxis 3d as compared to that obtained by the wellknown sap2000, a widely used code. Dynamic analysis of single cylinder compressor block foundation using sap. In this work, analysis of pile soil structure interaction has been studied by finite element software ansys 11. Kinematic interaction principally affects the frequency content and amplitude of foundation motions relative to freefield motions e. The seven story structure is representative of a class of buildings constructed in greece during the 70s, having relatively long span dimensions and an elevator shear wall core.
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