Soil structure interaction analysis methods state of art. Results of the sssi analysis were compared with those from soil structure interaction ssi analysis of the individual buildings, for the following parameters. Soilstructure interaction modelling for piles in performancebased seismic design. Soilstructureinteraction analysis in time domain infoscience. Jun 23, 2016 soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. The span of the columns is 3m in x direction and 3m in z direction. The comparison of natural period, base shear and total relative displacements of the structure has been realized based on analytical models. Soil structure interaction broadly can be divided into two phenomena. Freedman and keer 1972 studied the response of a body resting on the surface of a transversely isotropic halfplane and presented exact solutions in terms of dual integral equations. Substructure method cannot accurately capture the non linear behavior experienced by the foundation and surrounding ground during an earthquake. A computer program is prepared to analyze the soilstructure system. Technical paper soilstructure institution of civil. Effects of soilstructure interaction on the seismic. However, modeling of soilstructure interaction is affected by issues associated with the soil being.
Lateral load analysis considering soilstructure interaction. This paper addresses the time history finite element analysis of rock structure interaction. 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. Introduction in a dynamic soilstructure interaction problem, the structure is supported by an unbounded. Numerical analysis of nonlinear soil structure interaction m. Conventional method of analysis a symmetrical 5 storey building is modeled using direction and 4 no of bays in z direction.
Northridges time history earthquakes considering the soilstructure interaction ssi effects or base isolated system. Earthquake wavesoilstructure interaction analysis of tall. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Dynamic soilstructure interaction analysis in time domain. Soilstructureinteraction analysis in time domain prentice. The bounding surface plasticity model is implemented to model the near field. Nonlinear seismic soilstructure interaction analysis. A computer program is prepared to analyze the soil structure system. 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 analysis evaluates the collective response of these systems to a specified ground motion. Soil structure interaction analysis evaluates the collective response of these systems to a specified ground motion. Soil structure interaction response to high amplitude forced vibration d.
Analysis of i f must consider shear wall configuration and potential rotational coupling between walls 2. Nuclear engineering and design 111 1989 3893 northholland, amsterdam soil structure interaction analysis in time domain john p. Missouri university of science and technology scholars mine. Furthermore, according to fema 2000 the effects of soilstructure interaction must be evaluated for nearfield and soft soil sites and also for buildings in. Overview of soilstructure interaction principles jonathan p. In practice, the effects of soil structure interaction on the dynamic response of structures are usually neglected. As will be shown in this paper, the incorporation of soil structure interaction ssi and structure to soil structure interaction sssi shifts the relatively rigid response of the ptcb into this critical frequency range.
Filename, seabc 1 soil structure interaction 25 26 june 2010 blair gohl the structural engineers association of british columbia a technical seminar about modeling soilstructure interaction in the analysis of buildings and bridges, and how the design of structures is affected by the incorporation of ssi effects. The nlssi analysis will consider geometric nonlinearities. A simplified 3d model for soilstructure interaction with. There is a consensus that these frequency domain codes give reasonably accurate results for lowintensity ground motions that result in almost linear response.
Nonlinear time domain analysis involves nonlinearities in the materials andor geometry such as loss of contact between soil and structure, and inelastic action in soil and structure. Frequency response analysis of soilstructure interaction. Soilstructure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Nuclear engineering and design 111 1989 3893 northholland, amsterdam soilstructureinteraction analysis in time domain john p. There is a consensus that these frequencydomain codes give reasonably accurate results for lowintensity ground motions that result in almost linear response.
Box 8022, zurich, switzerland received 6 october 1987 381 the procedures to perform nonlinear soil structure interaction analysis in the time domain are summarized. In this study, the effect of soilstructure interaction on the dynamic response of structures has been examined. The objective of this study is to perform a rigorous seismic nonlinear soil structure interaction analysis in the time domain to satisfy the above re. As will be shown in this paper, the incorporation of soilstructure interaction ssi and structuretosoilstructure interaction sssi shifts the relatively rigid response of. Soilstructure interaction modelling for piles in performance. A new numerical procedure is proposed for the analysis of three. Soil structure interaction analysis of multi storey building. Modelling of ssi method of analysis soil structure interaction frequency dependent impedance functions constant impedance functions mod. To establish a firm base for the classification of the methods, the objective and the significant features of soilstructureinteraction analysis described in the. Nonlinear seismic soilstructure interaction analysis based. Numerical analysis of nonlinear soilstructure interaction.
Comparing the results with those in literature shows the exactness and competency of the proposed method. Finally, a soilstructure interaction analysis of the 181 fremont tower without the ttc is performed and compared with the results of the sssi analysis. Procedures for accomplishing these tasks are outlined below. This may be useful when performing analyses for beyond design basis events see chapter 1. Purchase dynamic soilstructure interaction, volume 83 1st edition. To establish a firm base for the classification of the methods, the objective and the significant features of soil structure interaction analysis described in the. The nlssi methodology can be implemented using both. The objective of this study is to perform a rigorous seismic nonlinear soilstructure interaction analysis in the time domain to satisfy the above re. Introduction in a dynamic soil structure interaction problem, the structure is supported by an unbounded. There are two methods available for modeling the soil structure interaction ssi. Numerical analysis of nonlinear soilstructure interaction m. In a seismic soil structure interaction analysis, it is necessary to consider the in nite and layer characteristics of soil strata, and the nonlinear behaviors of soft soil. Numerical results show that soilstructure interaction has negligible effects on the. Soilstructure interaction effects on seismic behaviour of.
Soilstructure interaction ssi analysis in the nuclear industry is currently performed using linear codes that function in the frequency domain. Effect of interactions on dynamic active earth pressures m. There are two methods available for modeling the soilstructure interaction ssi. This includes the selection of the soil model, the far field model, the structural model and the soil structure interaction analysis method. 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 and seismic design code provision. Analysis time function of interaction nodes inefficient specially when. 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. Soil structure interaction and seismic design code provision table 2. Soil structure interaction modelling for piles in performancebased seismic design. Gts nx 49 conclusion midas gen has internal py curves in order to easily apply soil springs and run soil structure interaction through substructure method. 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. Soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. Maugeri department of civil and en vironmen tal engineering, university of catania, italy abstract the present paper deals with a parametric study of soilfoundationframe interaction in pseudostatic conditions by means of a new finite element code, named sofia. Demonstration of time domain 2d model demonstration of the explicit time domain capabilities using a 2d model of the calcine disposition project cdp process in the existing iwtu cells this demonstrates the modeling capabilities of explicit time domain codes to model contact and allow waves to travel through soil and structure during.
Fema 2000 implies that soilstructure interaction may modify the seismic demand on a building. The dynamic effect of the soil structure interaction is clear. Recent advances in nonlinear soilstructure interaction. The presence of the ttc has a significant effect on the demands of the basement walls, diaphragms and drilled shafts. Effects on displacementbased pushover analysis initial seismic demand freefield. Seismic soilstructure interaction in the time domain. Soilstructureinteraction analysis in time domain prentice hall international series in civil engineering and engineering mechanics.
Modelling of ssi method of analysis soilstructure interaction frequency dependent impedance functions constant impedance functions mod. A time domain analysis procedure and method for seismic soil structure interaction analysis are introduced in this work. In this study, the effect of soil structure interaction on the dynamic response of structures has been examined. Feb 29, 2012 the natural eigen frequency of the soil layer without footing which is 18. Soil structure interaction ssi analysis in the nuclear industry is currently performed using linear codes that function in the frequency domain. Analysis and design of structures subjected to arbitrary dynamic loadings especially earthquakes have been studied during past decades. Appendix b nonlinear time domain soil structure interaction. On soilstructure interaction analysis of concrete gravity.
Maugeri department of civil and en vironmen tal engineering, university of catania, italy abstract the present paper deals with a parametric study of soil foundationframe interaction in pseudostatic conditions by means of a new finite element code, named sofia. Timedomain soilstructure interaction analysis of nuclear. The earthquake wave soil structure interaction analysis of tall buildings is the main focus of this research. Purpose of this paper is to present a methodology for high. Soilstructure interaction livermore software technology. Determination of structure soil structure interaction sssi effects, if any between large and more massive process building pb and exhaust fan building efb. Examples of soilstructure interaction sheetpile walls prestressed anchors diapraghm walls nailing foundation rafts with piles buildingfoundation in all the above problems strong displacementpressure discontinuity may appear.
The exhaustive cost of existing time domain solutions for the soilstructure analysis problem as well as the tradition of conducting twodimensional analysis on dam systems have led to the widescale use of twodimensional analysis routines for seismic demand. Linear material properties for soil and structure tied soil structure interface behavior applicable to small range of seismic hazard. Development and deployment of analysis methodologies suitable for computing the response of deeplyembedded power reactors, including nonlinear time domain, soilstructureinteraction analysis 3. 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. Earthquake ground motion causes soil displacement known as freefield. It is very important to note that the structural response is mainly due to the soil structure interaction forces that brings an impact on the structure. This includes the selection of the soil model, the far field model, the structural model and the soilstructure interaction analysis method. Introduction when designing a structure, the interaction of the structure with the soil is an important consideration in many cases, the absolute and relative stiffness of the soil have a significant impact on the forces experienced by the substructure elements. This is especially applicable to areas of seismic activity. Modeled is not only the lateral energy dissipation, but also the interaction between the far field and the numerical model itself. Soilstructure interaction effects, analysis and applications in design the study of soil structure interaction ssi is related to the field of earthquake engineering. The analysis is highly essential for predicting a more accurate structural behavior so as to improve the safety of structures under extreme loading conditions. Earthquake wavesoilstructure interaction analysis of. Box 8022, zurich, switzerland received 6 october 1987 381 the procedures to perform nonlinear soilstructureinteraction analysis in the time domain are summarized.
Dynamic soilstructure interaction, volume 83 1st edition. In practice, the effects of soilstructure interaction on the dynamic response of structures are usually neglected. Soilstructure interaction response to high amplitude forced vibration d. For the sake of application of the awpmdl elements in the time domain, a finite element algorithm was presented.
The relative stiffness of the soil from one substructure element to another is also. This paper addresses the time history finite element analysis of rockstructure interaction. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. In a seismic soilstructure interaction analysis, it is necessary to consider the in nite and layer characteristics of soil strata, and the nonlinear behaviors of soft soil. Examples of soil structure interaction sheetpile walls prestressed anchors diapraghm walls nailing foundation rafts with piles buildingfoundation in all the above problems strong displacementpressure discontinuity may appear. Comparative study of timedomain versus frequency domain. Soilstructureinteraction analysis in time domain prentice hall international series in civil engineering and engineering mechanics wolf, john p. For time history analyses the modelling of soil by the sbfem in time domain is straightforward figure 3a. However, modeling of soil structure interaction is affected by issues associated with the soil being. S demonstration of time domain 2d model demonstration of the explicit time domain capabilities using a 2d model of the calcine disposition project cdp process in the existing iwtu cells this demonstrates the modeling capabilities of explicit time domain codes to model contact and allow waves to travel through soil and structure during. In this study, a procedure was given to apply awpmdls in the time domain for soil structure interaction analysis. Dynamic analysis of partially embedded structures considering. Based on the above limited literature overview, it seems that importance of full ssi analysis is well established in the research community.
The exhaustive cost of existing time domain solutions for the soil structure analysis problem as well as the tradition of conducting twodimensional analysis on dam systems have led to the widescale use of twodimensional analysis routines for seismic demand. Finally, a soil structure interaction analysis of the 181 fremont tower without the ttc is performed and compared with the results of the sssi analysis. Detail of soil parameter considered shear wave poissions mass density description velocity v s ratio r knm3 msec rock 1500 0. The soil and ground motion characteristics are most critical in the low frequency range at the hanford site. The procedure was developed based on the awpmdl elements in the frequency domain, which was proposed recently. A time domain analysis procedure and method for seismic soilstructure interaction analysis are introduced in this work. To measure the effect of movement in the interaction, the tower oscillation and the vibration on the soil surface was measured simultaneously. In this study, the soil is modelled as a linear elastic solid, however, the methods developed can be adapted to include the effects of soil non. The importance of performance based design approaches and soil structure interaction in seismic design of structures are internationally recognized.
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