Structure with foundation on soil elastic, 3d elements duration. Thus, the need for research into soilstructure interaction ssi problems is greater than ever. General topics sap2000 csibridge etabs safe perform3d csicol tutorials test problems documentation. 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. Pdf modeling of soilstructure interaction as finite element using. A threeparameter elastic foundation model is used to incorporate the soilstructure interaction effect. The report further illustrate the resonance vibration of building and variation in nature of design.
Full modeling of soil, foundation, structure propagate waves through system. For deep foundation analysis, the fem and the soil response program must agree or converge on soilstructure lateral response. 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 at a finite distance from a structure, the absolute displacements must approach the freefield displacements 16. Sap2000 abilities for soilstructure interaction civil.
About the manuals this manual is designed to help you quickly become productive with sap2000. To this aim it is proposed for the first time to exploit the structuresoilstructure mechanism to develop a device, hosted in the soil but detached from the structure, able to absorb part of the seismic energy so to reduce the vibration of neighbourhood structures. I am modelling a tunnel structure rectangular using soil. Soil structure interaction and seismic design code provision. Nonlinear dynamic soil structure interaction analysis. Effects of soilstructure interaction on the excitation and. The bridge fem then uses the stiffness of the element to predict the seismic structural response.
Which model is better for soilstructure interaction in. It is strongly recommended that you read this manual and work the tutorial before attempting a real project using sap2000. Vibration control of piledstructures through structuresoil. Fema 2000 implies that soil structure interaction may modify the seismic demand on a building. In this study, the effect of soil structure interaction on behavior of reinforced concrete.
Attached articles abaqus and sap2000 programs are used to model the pilesoil interaction in sand. Please also see the topic sap2000 news in the help facility within the program to learn more about the new and improved features in sap2000. Furthermore, according to fema 2000 the effects of soilstructure interaction must be evaluated for nearfield and soft soil sites and also for buildings in. There are two methods available for modeling the soilstructure interaction ssi.
Csi analysis reference manual for sap2000, etabs, safe. In that model, the layered soil medium is divided into thin layers and each thin layer is represented by a parametric model. Which model is better for soilstructure interaction in sap. The computational method has been applied to important engineering practice han, 1987, and han, et al, 1999. Inertial interaction springs used to represent soilfoundation interaction complexvalued real part. We aim to close the gap to the industry by improving the awareness about latest trends in civil engineering. Which model is better for soilstructure interaction in sap 2000 joint. Without an interface the structure and the soil are tied together. Aug 20, 2012 to simulate the interaction between a structure and soil you can apply interface elements.
Soil structure interaction amec presentationfinal 1. Effects of soil structure interaction on the excitation and response of a mediumrise rc building it is common tradition in iceland to found structures on compact gravel cushions. The behavior of soil is predicted based on the engineering properties of soil, vertical soil profile and the alignment of ground surface. Earthquake wavesoilstructure interaction analysis of. The third part of this volume, the sap2000 introductory tutorial manual, is intended to provide firsttime users with handson experience using the modeling, analysis and design features of sap2000. May 10, 2017 general topics sap2000 csibridge etabs safe perform3d csicol. The winkler foundation is a model that can be created in order to represent the stiffness and the dampening effects of the soil surrounding a pile shaft. The earthquake wavesoilstructure interaction analysis of tall buildings is the main focus of this research. Optimum design of braced steel space frames including soilstructure interaction is studied by using harmony search hs and teachinglearningbased optimization tlbo algorithms. The objective of this thesis is to develop applicable guidelines to analyse and model large slab foundation structures. What is the best representation of soil on sap2000 to study. The third part of this volume, the sap2000 introductory tutorial manual, is intended to provide firsttime users with handson experience using the. Soilstructure interaction livermore software technology corp.
I work on a project of soil structure interaction which use a steel pile in the soil so that i want to represent these piles in sap2000 program, i want the method that can represent these piles in. Seismic analysis and design of retaining walls, buried structures, slopes, and embankments explores analytical and design methods for the seismic design of retaining walls, buried structures, slopes, and embankments. Soilstructure and interaction ssi analysis is similar kind of problem where all the. Hence the investigation on the energy transfer mechanism from soils to buildings during earthquakes is critical for the seismic design of multistory buildings and for upgrading existing structures. A simple threedimensional soilstructure interaction ssi model is proposed. A 10storey braced steel space frame example taken from literature is investigated according to four different. 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 soilstructure interaction problems. Soil structure interaction using springs on sap2000 stressed civilenvironmental 25 jul 15 15. Soil structure interaction and seismic design code provision even though the soil has good engineering characteristics 3. Soil springs stiffness properties are not degradation with pushover load curve. Fema 2000 implies that soilstructure interaction may modify the seismic demand on a building. A cantilever retaining wall is considered and is been modeled for the soilstructure interaction using finite element package sap2000 version 14. Define links, and their associated properties, which will represent lateral support from the soil. How to model a soilstructure interaction for a pile using nonlinear.
Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. I work on a project of soil structure interaction which use a steel pile in the soil so that i. Effects of soilstructure interaction on the excitation. By using an interface, node pairs are created at the interface of structure and soil. In this load transfer mechanism, the characteristics of soil has very important role.
Sap2000 tutorials training videos, manuals and model files. 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. Which model is better for soilstructure interaction in sap 2000 jointsprings or. Csi software models soilstructure interaction using a oneparameter winkler soil model. The direct method is used for modeling the soil and a tall building together. Jun 23, 2016 in soilstructure interaction analysis the distribution of load from the structure to the soil is investigated. This differs from foreign traditions where it is more common to found structures on piles where the soil is thick. Dynamic soilstructure interaction is one of the major topics in earthquake engineering and soil dynamics since it is closely related to the safety evaluation of many important engineering projects, such as nuclear power plants, to resist earthquakes. Civilax is the knowledge base covering all disciplines in civil engineering.
Soil structure interaction using springs on sap2000. In other words, the moment, shear, deflection, and rotation of the two programs should be within 10 percent. Dynamic soilstructure interaction, volume 83 1st edition. Soilstructure interaction livermore software technology.
Based on conventional theories it has been said that the soil structure interaction has effects that are beneficial for the structural response. Pdf modeling of soilstructure interaction as finite. Soilstructure interaction effects on seismic behaviour of. To investigate soil structure interaction, a series of dynamic experiments were performed on fullscale mat foundations han, 1989 and on fullscale piles han and novak, 1989, 1992. Soilstructure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. 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. Soil structure interaction and structural response. Soilstructure interaction etabs computers and structures. Modeling, analysis and design courses london, uk computer and structures, inc. First, a model is developed for a layered soil medium.
Furthermore, according to fema 2000 the effects of soil structure interaction must be evaluated for nearfield and soft soil sites and also for buildings in. Soil structure interaction, seismic design, reinforced concrete buildings. Soil structure interaction effects on pushover analysis of. Effect of interactions on dynamic active earth pressures m. A simple soilstructure interaction model sciencedirect. Vibration control of piledstructures through structure. Most of the design codes for structures recommends neglecting the effect of ssi in the seismic analysis of the structure. Nov 29, 2014 soil conditions have a great deal to do with damage to structures during earthquakes. Models using linear elements that are not based on nonlinear soil structure interaction are. Dynamic soil structure interaction is one of the major topics in earthquake engineering and soil dynamics since it is closely related to the safety evaluation of many important engineering projects, such as nuclear power plants, to resist earthquakes.
The latest release of sap2000 is available in three different analytical levels that all share the same graphical user interface. Soil structure interaction for building structures prepared for u. I am trying to show the soil structure interaction using line springs, link property. This paper deals with the vibration control of existing structures forced by earthquake induced ground motion. Manual, computers and structures, inc, berkeley, calif. Soilstructure interaction technical knowledge base computers. Keywords elevated water tanks, tank staging fluidstructure interaction seismic response sap2000. Optimum design of braced steel space frames including soil. Sap2000 is the finite element that is used in simulation of nonlinear super structure and soil structure interaction by linear springs.
Spra that utilizes nonlinear soilstructure interaction nlssi analysis. You can refer to the attached tutorial for details. Simplified conceptual equation for soilstructure interaction for. 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. Overview of soilstructure interaction principles jonathan p. Comparison of structural elements response in plaxis 3d. Optimum design of braced steel space frames including soil structure interaction is studied by using harmony search hs and teachinglearningbased optimization tlbo algorithms. However, earthquakes in recent years have clearly shown the importance of soil structure interaction on the design of the structures, and studies on soil structure interaction have increased especially in the last 50 years. Chapter 1 welcome to sap2000 program levels and features 1 3. To investigate soilstructure interaction, a series of dynamic experiments were performed on fullscale mat foundations han, 1989 and on fullscale piles han and novak, 1989, 1992. If the soil material can be considered linear, the sap2000 program, using the solid the general equation of motion for a system subjected to an element. 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. To simulate the interaction between a structure and soil you can apply interface elements. May 06, 2018 modeling of soil in sap2000 for use in soil structure interaction.
Downloads code sap2000 abilities for soil structure interaction arabic. Evaluation of soilfoundationstructure interaction effects. In soilstructure interaction analysis the distribution of load from the structure to the soil is investigated. Fem model for fluidstrucutreinteraction added mass approach tanksoil interaction can be seen from fig. Soilstructure interaction response to high amplitude forced vibration d. What is the best representation of soil on sap2000 to. Welcome to soilstructure software tm soilstructure software. Overview of soil structure interaction principles jonathan p. Trbs national cooperative highway research program nchrp report 611. Impact of soil structure interaction on the seismic design of. Effects of soil structure interaction on behavior of. 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.
A threeparameter elastic foundation model is used to incorporate the soil structure interaction effect. Seismic analysis and design of retaining walls, buried. The modeling of lateral soil support proceeds as follows. Comparison of structural elements response in plaxis 3d and. The computer program sap2000 and all associated documentation are. Modelling the interaction between structure and soil for. Earthquake ground motion causes soil displacement known as freefield. Soilstructure interaction ssi analysis evaluates the collective response of three linked systems. Soilstructure interaction safe computers and structures. Jun 30, 2015 sap2000 research papers download sap2000 abilities for soil structure interaction arabic download. Which model is better for soilstructure interaction in sap 2000 jointsprings or link element. A realistic model of structure and soil interaction can lead to an optimal and economical structure.
Soil conditions have a great deal to do with damage to structures during earthquakes. Modeling of soil in sap2000 for use in soil structure interaction. 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. Downloads code sap2000 abilities for soilstructure interaction arabic. Plaxis 3d as compared to that obtained by the wellknown sap2000, a widely used code for structural analysis. 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. Effects of soilstructure interaction on the excitation and response of a mediumrise rc building it is common tradition in iceland to found structures on compact gravel cushions. Dear all, i am modelling a tunnel structure rectangular using soilstructure interaction in sap2000. Soilstructure interaction broadly can be divided into two phenomena. Soil modeling is demonstrated in the example problem, beam on elastic foundation, available within the software interface through help contents and index example problems problem j. A single structural model can be used for a wide variety of different types of analysis and design. 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.
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