A computer program is prepared to analyze the soil structure system. Numerical analysis of nonlinear soilstructure interaction m. Introduction in a dynamic soilstructure interaction problem, the structure is supported by an unbounded. To measure the effect of movement in the interaction, the tower oscillation and the vibration on the soil surface was measured simultaneously. The comparison of natural period, base shear and total relative displacements of the structure has been realized based on analytical models. A simplified 3d model for soilstructure interaction with. There is a consensus that these frequencydomain codes give reasonably accurate results for lowintensity ground motions that result in almost linear response. The earthquake wave soil structure interaction analysis of tall buildings is the main focus of this research. In this study, the effect of soilstructure interaction on the dynamic response of structures has been examined. The system for analysis of soil structure interaction sassi lysmer et al. A time domain analysis procedure and method for seismic soil structure interaction analysis are introduced in this work.
The objective of this study is to perform a rigorous seismic nonlinear soilstructure interaction analysis in the time domain to satisfy the above re. Soil structure interaction analysis of multi storey building. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. Various combinations of soil and structure can either. Soil structure interaction analysis evaluates the collective response of these systems to a specified ground motion. 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. Soilstructureinteraction analysis in time domain prentice. Recent advances in nonlinear soilstructure interaction. Frequency response analysis of soilstructure interaction. The procedure was developed based on the awpmdl elements in the frequency domain, which was proposed recently. Soilstructure interaction effects on seismic behaviour of. The dynamic effect of the soil structure interaction is clear. Soilstructure interaction livermore software technology. Earthquake wavesoilstructure interaction analysis of.
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. Detail of soil parameter considered shear wave poissions mass density description velocity v s ratio r knm3 msec rock 1500 0. Soilstructureinteraction analysis in time domain infoscience. The soil and ground motion characteristics are most critical in the low frequency range at the hanford site. There is a consensus that these frequency domain codes give reasonably accurate results for lowintensity ground motions that result in almost linear response.
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. This includes the selection of the soil model, the far field model, the structural model and the soil structure interaction analysis method. 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. In this study, a procedure was given to apply awpmdls in the time domain for soil structure interaction analysis. Dynamic soilstructure interaction analysis in time domain.
In practice, the effects of soilstructure 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. Soil structure interaction response to high amplitude forced vibration d. Soilstructureinteraction analysis in time domain prentice hall international series in civil engineering and engineering mechanics wolf, john p. A computer program is prepared to analyze the soilstructure system. Soil structure interaction broadly can be divided into two phenomena. Modelling of ssi method of analysis soilstructure interaction frequency dependent impedance functions constant impedance functions mod. Procedures for accomplishing these tasks are outlined below. Soilstructure interaction modelling for piles in performance. Earthquake ground motion causes soil displacement known as freefield. The nlssi analysis will consider geometric nonlinearities. Soil structure interaction modelling for piles in performancebased seismic design.
Linear material properties for soil and structure tied soil structure interface behavior applicable to small range of seismic hazard. Numerical analysis of nonlinear soilstructure interaction. There are two methods available for modeling the soilstructure interaction ssi. 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. Soilstructure interaction response to high amplitude forced vibration d. 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. 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. For time history analyses the modelling of soil by the sbfem in time domain is straightforward figure 3a. Dynamic soilstructure interaction, volume 83 1st edition. Analysis time function of interaction nodes inefficient specially when. Earthquake wavesoilstructure interaction analysis of tall.
Soil structure interaction ssi analysis in the nuclear industry is currently performed using linear codes that function in the frequency domain. The nlssi methodology can be implemented using both. Technical paper soilstructure institution of civil. Structuresoilstructure interaction analysis in a highly. In this study, the effect of soil structure interaction on the dynamic response of structures has been examined. This paper addresses the time history finite element analysis of rockstructure interaction. Northridges time history earthquakes considering the soilstructure interaction ssi effects or base isolated system. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Soil structure interaction and seismic design code provision. 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. Numerical analysis of nonlinear soil structure interaction m. Results of the sssi analysis were compared with those from soil structure interaction ssi analysis of the individual buildings, for the following parameters. 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. There are two methods available for modeling the soil structure interaction ssi.
In practice, the effects of soil structure interaction on the dynamic response of structures are usually neglected. 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. Finally, a soilstructure interaction analysis of the 181 fremont tower without the ttc is performed and compared with the results of the sssi analysis. Effects on displacementbased pushover analysis initial seismic demand freefield. However, modeling of soilstructure interaction is affected by issues associated with the soil being. Soilstructure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Conventional method of analysis a symmetrical 5 storey building is modeled using direction and 4 no of bays in z direction.
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. Introduction in a dynamic soil structure interaction problem, the structure is supported by an unbounded. Effect of interactions on dynamic active earth pressures m. 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. 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. The bounding surface plasticity model is implemented to model the near field. Development and deployment of analysis methodologies suitable for computing the response of deeplyembedded power reactors, including nonlinear time domain, soilstructureinteraction analysis 3. Comparing the results with those in literature shows the exactness and competency of the proposed method. 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.
Determination of structure soil structure interaction sssi effects, if any between large and more massive process building pb and exhaust fan building efb. To establish a firm base for the classification of the methods, the objective and the significant features of soilstructureinteraction analysis described in the. Timedomain soilstructure interaction analysis of nuclear. 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. Purchase dynamic soilstructure interaction, volume 83 1st edition.
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. This is especially applicable to areas of seismic activity. Box 8022, zurich, switzerland received 6 october 1987 381 the procedures to perform nonlinear soilstructureinteraction analysis in the time domain are summarized. It influences the behavior of soil, as well as the response of pile under loading. This paper addresses the time history finite element analysis of rock structure interaction. Nuclear engineering and design 111 1989 3893 northholland, amsterdam soilstructureinteraction analysis in time domain john p. A new numerical procedure is proposed for the analysis of three. As will be shown in this paper, the incorporation of soilstructure interaction ssi and structuretosoilstructure interaction sssi shifts the relatively rigid response of. Analysis of i f must consider shear wall configuration and potential rotational coupling between walls 2. Furthermore, according to fema 2000 the effects of soilstructure interaction must be evaluated for nearfield and soft soil sites and also for buildings in. This may be useful when performing analyses for beyond design basis events see chapter 1. Modeled is not only the lateral energy dissipation, but also the interaction between the far field and the numerical model itself. Soilstructure interaction ssi analysis in the nuclear industry is currently performed using linear codes that function in the frequency domain. Feb 29, 2012 the natural eigen frequency of the soil layer without footing which is 18.
Analysis and design of structures subjected to arbitrary dynamic loadings especially earthquakes have been studied during past decades. Numerical results show that soilstructure interaction has negligible effects on the. Overview of soilstructure interaction principles jonathan p. Modelling of ssi method of analysis soil structure interaction frequency dependent impedance functions constant impedance functions mod. Jun 23, 2016 soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. The analysis is highly essential for predicting a more accurate structural behavior so as to improve the safety of structures under extreme loading conditions. The span of the columns is 3m in x direction and 3m in z direction. The presence of the ttc has a significant effect on the demands of the basement walls, diaphragms and drilled shafts.
Seismic soilstructure interaction in the time domain. Effects of soilstructure interaction on the seismic. Soilstructure interaction plays an important role in the behavior of structure under static or dynamic loading. On soilstructure interaction analysis of concrete gravity. The earthquake wavesoilstructure interaction analysis of tall buildings is the main focus of this research. Soil structure interaction and seismic design code provision table 2. 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. 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. Soil structure interaction analysis methods state of art. Nonlinear seismic soilstructure interaction analysis. Purpose of this paper is to present a methodology for high. 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.
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. The relative stiffness of the soil from one substructure element to another is also. Soilstructure interaction modelling for piles in performancebased seismic design. Fema 2000 implies that soilstructure interaction may modify the seismic demand on a building. Soilstructureinteraction analysis in time domain prentice hall international series in civil engineering and engineering mechanics. 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. 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. Box 8022, zurich, switzerland received 6 october 1987 381 the procedures to perform nonlinear soil structure interaction analysis in the time domain are summarized. Dynamic analysis of partially embedded structures considering. Appendix b nonlinear time domain soil structure interaction. Nonlinear seismic soilstructure interaction analysis based. 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.
Comparative study of timedomain versus frequency domain. 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. 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. 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. 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.
Based on the above limited literature overview, it seems that importance of full ssi analysis is well established in the research community. Soilstructure interaction analysis evaluates the collective response of these systems to a specified ground motion. Soilstructure interaction effects, analysis and applications in design the study of soil structure interaction ssi is related to the field of earthquake engineering. Lateral load analysis considering soilstructure interaction. This includes the selection of the soil model, the far field model, the structural model and the soilstructure interaction analysis method.
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