The national institute of standards and technology nist is a federal technology agency within the u. Fbmultipier couples nonlinear structural finite element analysis with nonlinear static soil models for axial, lateral and torsional soil behavior to provide a robust system of. Sep, 2012 the starting point for this work was decades of available soil structure interaction research, and recently published engineering guidance for static analysis procedures. This is especially applicable to areas of seismic activity. To estimate soilstructure interaction ssi effects in two instrumented buildings. Soilstructure interaction ssi effect is analyzed by considering flexible spring based base and effects are compared with rigid base considering fixed base effect. 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. Elastic solutions for static stiffness of rigid footings at the ground surface and. Soil structure interaction of spillway walls adjacent to embankments 1 soil structure interaction introduction an extremely important aspect of the analyses of an embankment dam with a gated concrete spillway is the interaction of soil with the spillway walls during a seismic event. The primary goal of this project was the evaluation and improvement of the nonlinear static procedures. Overview of soilstructure interaction principles jonathan p. The fourth in the highly respected short course series, a short course in soilstructure engineering of deep foundations, excavations and tunnels, focuses on the three major geotechnical challenges of static soilstructure interaction problems.
Four different mathematical model elements are incorporated into the three dimensional computer program which possesses the capability of performing linear or nonlinear timehistorydynamic response analysis. Fbmultipier each pier structure is composed of pier columns and cap supported on a pile cap and pilesshafts with nonlinear soil. Soilstructure dynamic interaction by means of fem bowles, 1996 allows for a complete model of both the superstructure, the foundation system and the sur. Modelling and simulation of static and dynamic soils structures interaction under uncertainty boris jeremi. Evaluation of soilstructure interaction effects on. This document, improvement of nonlinear static seismic analysis procedures fema 440, reaffirms femas ongoing efforts to improve the seismic safety of new and ex isting structures in this country. Pdf early history of soilstructure interaction naveen. Soil structure interaction arash khosravifar fugro consultants, inc. The second approach is the back calculation of the soil stiffness, based on the soil structure interaction. Results for the three models are shown in tables 1 to 3 for static and dynamic. Soilpilecap static interaction analysis by finite and. During the design phase of nuclear buildings, the soilstructure interaction under static loads is often modelled using. Dynamic soil structureinteraction geoslope international. Although much more attention has been paid in recent years regarding soilstructure interaction for dynamic loading, highly conservative values of the static frictional resistance between soil and structure are used in design.
Soilpilestructure interaction geotechnical ronaldo luna, ph. This method is rarely used in practice as it involves large computation and is very complex to analyze. An efficient finitediscrete element method applicable for the analysis of quasi. Dec 22, 20 soilstructure frictional resistance is required while designing foundation systems and retaining walls. The first one is the common way, using the rayleigh waves dispersion on the soil surface, and the back calculation to shear wave profiles. Soil pile interaction single pile pushover clay 0 0 20000 30000 40000. The second approach is the back calculation of the. Follow the links provided to stream and download media content. To solve the durability problem of expansion joints and bearings, integral abutment bridges iabs have become increasingly popular. Static soil structure interaction analysis by febe coupling method zhengwen yang and wenda lu shanghai institute of applied mathematics and mechanics, peoples republic of china in the present paper the analysis of the static soil structure interaction is presented by use of a coupling method combining a finite element method with a boundary element method. Soilstructure interaction ssi analysis is a special field of earthquake engineering. Soilstructure interaction modelling for piles in performancebased seismic design. Substructure approach in soil structure interaction. Static soilstructure interaction response of hyperbolic cooling towers to.
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 soil stratum. Soil structure interaction under semi static loads in an. Distribution statement micropiles, soilstructure interaction, site response, nonlinear soil behavior, finite elements no restrictions. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces im pacting structure by the definition of seismic excitation.
Soilstructure interaction is an interdisciplinary field of endeavor which lies at the intersection of soil and structural mechanics, soil and structural dynamics, earthquake engineering, geophysics and geomechanics, material science, computational. Vibratory pile design can be considered as a complex soil structure interaction analysis, whereby the pile performance is dependent not only on the ground conditions and the geotechnical characteristics but also on the nature of the installation process. Feb 29, 2012 the natural eigen frequency of the soil layer without footing which is 18. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and. Numerical results show that this approach is quite efficient and versatile for various soilstructure interaction problems. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. Dynamic soil structure interaction geoslope international. All facilities are based on the trusted and proven general capability of the lusas finite element system. Numerical results show that the effect of the static interaction on the. A short course in soilstructure engineering of deep. 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 static and dynamic behavior of micropiles was studied via the effects of aforementioned independent variables on the deflections and bending moments along the micropile length. The importance of performance based design approaches and soil structure interaction in seismic design of structures are internationally recognized. Modelling and simulation of static and dynamic soils. Soilstructure interaction is an interdisciplinary field of endeavor which lies at the intersection of soil and structural mechanics, soil and structural dynamics, earthquake engineering, geophysics and geomechanics, material science, computational and numerical methods, and. This model should allow an accurate representation of the soil structure interaction ssi which is considered as an input data for the structural models. The dynamic effect of the soil structure interaction is clear. Deep foundations piles, barrettes, multipropped deep excavations and bored and open face tunnels beneath cities. Not much emphasis has been given lately to evaluate static. Chapter viii dynamic soil structure interaction analysis under. Soilstructure interaction for building structures nist. Soilstructure interaction effects in two instrumented tall buildings. 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. Jun 23, 2017 tutoriel 01 ansys interaction sol structure ansys. Soil structure interaction modelling for piles in performancebased seismic design.
A weak zone is introduced around the pile to approximately account for slip between the soil and the pile. The following information details specific capabilities of lusas for soilstructure interaction modelling. Vibratory pile design can be considered as a complex soilstructure interaction analysis, whereby the pile performance is dependent not only on the ground conditions and the geotechnical characteristics but also on the nature of the installation process. Soilstructure interaction ssi analysis evaluates the collective response of three linked systems. Nonlinear static and dynamic analysis of buildings. Ssi is nothing but the soil structure interaction refers to the effects of the supporting foundation medium on the motion of structure. In an axially loaded pile, the load is transferred to the soil through the side friction at the soil. The importance of soilstructure interaction ssi effects on the seismic. 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. 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. Substructure method cannot accurately capture the non linear behavior experienced by the foundation and surrounding ground during an earthquake. Four different mathematical model elements are incorporated into the three dimensional computer program which possesses the capability of performing linear or nonlinear timehistorydynamic.
Midas gen has internal py curves in order to easily apply soil springs and run soil structure interaction through substructure method. Soilstructure frictional resistance is required while designing foundation systems and retaining walls. Soil structure interaction ssi is a fundamental aspect for reaching a thorough understanding of this type of structure not only for newly built bridges but also in the retrofitting of existing ones. This study describes the implementation of a 2d finite element model of iab system which explicitly incorporates the soil response. Earthquake ground motion causes soil displacement known as freefield. Piles in liquefied soils 2d approach uc davis with professor ross boulanger 2. Various combinations of soil and structure can either. Associate professor of civil engineering university of missourirolla umr geotechnical and bridge seismic design workshop new madrid seismic zone experience october 2829, 2004, cape girardeau, missouri spsi 2 investigators. The starting point for this work was decades of available soilstructure interaction research, and recently published engineering guidance for static analysis procedures. This paper includes an investigation about the influence of the ssi effect on the design of. Numerical analysis of nonlinear soil structure interaction m.
Walters projects have incorporated nonlinear dynamic and static analysis procedures. Soilstructure interaction effects on the seismic response of low. Geotechnical structures and infrastructure smalldisplacement soilstructure interaction for horizontally loaded piles in sand 2 the smalldisplacement stiffness, e. Below the np, the pile moves downwards relative to the soil, thus developing positive shaft friction psf. Soil structure interaction under semi static loads in an integral abutment bridge authors. A direct analysis of pilesoil static interaction by the combination of finite and infinite elements is presented. Soil structure interaction ssi analysis evaluates the collective response of three linked systems. Static soilstructure interaction analysis by febe coupling. Soil structure interaction ssi effect is analyzed by considering flexible spring based base and effects are compared with rigid base considering fixed base effect. The following information details specific capabilities of lusas for soil structure interaction modelling.
Above the np, the soil settles more with respect to the pile, so there is nsf. Stated conversely, the presence of a stiff structure could possibly affect the response of the ground to earthquake shaking. Static soilstructure interaction analysis by febe coupling method zhengwen yang and wenda lu shanghai institute of applied mathematics and mechanics, peoples republic of china in the present paper the analysis of the static soilstructure interaction is presented by use of a coupling method combining a finite element method with a boundary element method. Numerical analysis of nonlinear soilstructure interaction m. The soil mechanical model must allow representing the correct behavior of soil under the structure static loads accounting for the interaction effects due to neighboring buildings. Numerical analysis of nonlinear soilstructure interaction. Soil structure interaction broadly can be divided into two phenomena.
The pile and the nearfield soil medium are modelled by finite elements, whereas the farfield soil medium is modelled by mapped infinite elements. Ssi is nothing but the soilstructure interaction refers to the effects of the supporting foundation medium. Soilstructure interaction is an interdisciplinary field of endeavor which lies at the intersection of soil and structural mechanics, soil and structural dynamics, earthquake engineering, geophysics and geomechanics, material science, computational and numerical methods, and diverse other technical disciplines. Particular emphasis is placed on the interaction between soil and hyperbolic cooling tower. The handling of soil structure interaction in the analysis and design of integral abutment bridges has always been problematic due to its complexity. 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 pseudo static conditions by means of a new finite element code, named sofia.
Soilstructure interaction for building structures nehrp. Nonlinear modeling of dynamic soilstructure interaction. Soil structure interaction on spillway walls adjacent to. Soil structure dynamic interaction by means of fem bowles, 1996 allows for a complete model of both the superstructure, the foundation system and the sur. Static soilstructure interaction response of hyperbolic. Static soilstructure interaction analysis by febe coupling method. The dynamic properties of the soil can be determined in two different ways. An efficient finitediscrete element method for quasi. To solve the durability problem of expansion joints and. For the interaction of finite element static or dynamic analysis of a three dimensional rigid jointed framed structure resting on soil, the following types of elements.
Soil structure interaction ssi analysis is a special field of earthquake engineering. The handling of soilstructure interaction in the analysis and design of integral abutment bridges has always been problematic due to its complexity. The soil structure interaction activity is divided into two parts. Assessment of the soilstructure interaction based on. Influence of the soilstructure interaction on the design. Static soilstructure interaction response of hyperbolic cooling towers to symmetrical wind loads. The primary goal of this project was the evaluation and. Dynamic soilstructure interaction analysis soil model parameters50100100 0 elevatio n ft distance ft 0400 300 200 100150 200 300 dense to very dense sand sp material layer material description cohesive strength, c psf total unit weight pcf internal angle of friction. Soilstructure interaction modelling for piles in performance.
474 410 20 511 1234 707 216 407 936 376 603 1206 403 653 483 678 98 347 987 101 1384 609 304 79 1398 527 1526 900 998 1362 737 326 1109 1496 110 591 780 1224 247 674 850 823 1071 947 255