Flac software was chosen for the analyses so that structure and soil could be modeled together. Since the box culverts are the junction of two separated pieces, in the connection between them im also using conta172 and targe169 to simulate the connection, only with differents keyoptions and real constants. Common sense tells us that every seismic structural response is caused by soilstructure interaction forces impacting structure by the definition of seismic excitation. Soilstructure interaction ssi analysis evaluates the collective response of three linked systems. Three types of soil such as soft clay, sandy gravel and compacted sandy gravel are considered for this study.
Based on several documents, a systematic summary of the history and status of the structure soil structure dynamic interaction research that considers adjacent structures was proposed as a reference for researchers. 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. The dynamic effect of the soil structure interaction is clear. Approach sgh performs a broad range of services in soil structure interaction ssi analysis and wave propagation for the calculation of responses of structures. Estimating total system damping for soil structure. 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. A simple threedimensional soilstructure interaction ssi model is proposed. Generate detailed soil structure interaction results without all the extra effort. One can also define spring supports to simulate soil by using fixed but supports where the stiffness of the support springs can be entered directly by the user. Soil structure interface effects on dynamic interaction analysis of reinforced concrete lifelines y. Large civil structures such as concrete dams, nuclear power plants, highrise buildings and bridges are massive enough that their.
Raft and soil structure interaction oasys software webinar. Soil structure interaction plays an important role in the behavior of structure under static or dynamic loading. 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. Sassi is the system for analysis of soil structure interaction, a computer code for performing finite element analyses of soil structure interaction during seismic ground motions. Inertial soil structure interaction inertia from vibration of structure and foundation causes foundation translation and rotation u f and. Soil structure interactions an overview sciencedirect topics.
For this reason commercial software programs are available for conducting calculations regarding the soil structure interaction. Considering soil structure interaction makes a structure more flexible and thus increases the natural period of the structure as compared to the corresponding rigidly supported structure. The soil structure interact ion has been found to be significantly affecting the performance of structure and it is discussed in this paper. Soil structure interaction using wellknown cone models and how to apply it on conan and sap2000 software. Model full soil structure interaction that simulates full soil structure interaction. In this method, the soil foundation system is treated as an elastic or equivalentelastic system in the frequency domain i. Soil structure interactions an overview sciencedirect.
Soilstructure interaction response to high amplitude forced vibration d. This interaction is of great importance when it comes to predicting the sectional forces that will arise in a structure, along with the settlement that occurs. Soilstructure interaction livermore software technology corp. In this work, analysis of pile soil structure interaction has been studied by finite element software ansys 11. Structuresoilstructure interaction effects on the dynamic. Mtrsassi software is a substructuring program that uses the complex frequency response method and finite element technique to solve a wide range of dynamic soil structure interaction problems. One modeling feature useful to soilstructure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. Analysis of pile subjected to lateral loading in clay.
Effect of interactions on dynamic active earth pressures m. The best software for modeling intraction soil structure. Earthquake hazards reduction program nehrp earthquake structural and. Winkler spring and half space direct method models are used for flexible base for the frames founded on two types of soft soils. Plane82 for soil, plane183 for concrete, conta172 and targe169 for soilstructure interaction.
Since a layer of soil is most often in between a structure and the bedrock, a soil structure interaction between the foundation and the soil beneath occurs. A system for analysis of soilstructure interaction. Soilstructure interaction effects, analysis and applications in design the study of soilstructure interaction ssi is related to the field of earthquake engineering. Soilstructure interaction for building structures nehrp. In this line of research, the interaction of multiple, adjacent buildings during a seismic event, a phenomenon known as structure soil structure interaction sssi, is investigated. On the one hand, geotechnical engineers take great care over the representation of the soil, but then often assume the structure to be.
It is primarily an exchange of mutual stress, whereby the movement of the ground structure system is influenced by both the type of ground and the type of structure. The objective of this thesis is to develop applicable guidelines to analyse and model large slab foundation structures. Seismic soilstructure interaction studies on tall chimneys. Common sense tells us that every seismic structural response is caused by soil structure interaction forces impacting structure by the definition of seismic excitation. Lusas is used by engineers worldwide for all types of soil structural interaction modelling these case studies show illustrative uses of the software, with the most recently added article at the top.
Roessetc for a realistic soil structure interaction ssi analysis, material damping in the soils and structural materials as well as the foundation radiation damping should be considered. Geotechnical engineers and structural engineers tend to approach soilstructure interaction problems quite differently. Apr 01, 2014 raft and soilstructure interaction oasys software webinar duration. Also i would like to know of a software for the modelling of soil layers and their effect on the basic acceleration on the surface. The response of partially or fully buried structures or infrastructure is influenced by interaction with the surrounding soil. The elastic wave energy from foundation vibration was dissipated in three dimensions as radiation damping.
Jun 23, 2016 in soilstructure interaction analysis the distribution of load from the structure to the soil is investigated. Soil pile interaction single pile pushover clay 0 0 20000 30000 40000. This is especially applicable to areas of seismic activity. The program has been developed specifically for practical applications and has the following characteristics. Effect of soilstructure interaction in seismic analysis of. Methods for numerical analysis of soilstructure interaction. Several of the challenges associated with the integral bridge design can be ascribed to the attempt of managing the effect of the soil structure interaction terzaghi, 1936b caused by. How can i calculate bulk and shear modulus for any kind of soil. Pdf soil structure interaction using wellknown cone. This interaction is called soil structure interaction, abbreviated ssi.
Soil structure interaction and imperfect trench installations as applied to deeply buried conduits except where reference is made to the work of others, the work described in this dissertation is my own or was done in collaboration with my advisory committee. Components of the stiffness matrix at the pile head may be computed internally by lpile so users can incorporate basic soil structure interaction in their super structure analyses. A system for analysis of soil structure interaction university of california, berkeley. A range of soil structure interaction models and solution methods will be covered, ranging from the simple to the complex. Welcome to soilstructure software tm soilstructure software. This dissertation does not include proprietary or classified information. Dynamic analysis of soil structure interaction effect on. One modeling feature useful to soil structure interaction is the gap compressiononly link object, which enables foundation uplift without the development of tensile forces. The report further illustrate the resonance vibration of building and variation in nature of design. The hyperlinks below, present the concepts and techniques associated with modeling soilstructure 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. Effect of soil structure interaction on buildings with. Geotechnical and soil structure interaction analysis.
His industry experience in geotechnics spans various types of major projects in several african countries. A system for analysis of soilstructure interaction university of california, berkeley. Mar 01, 2017 more details on these options can be found under section 5. Ssi effects alter the natural frequency of the structure. System for analysis of soilstructure interaction sassi. Soil structure interaction and seismic design code provision. Csi software models soilstructure interaction using a oneparameter winkler soil model. Also i would like to know of a software for the modelling of soil layers and their effect on the basic acceleration.
Soilstructure interaction technical knowledge base. In this study dynamic analysis of soil structure interaction ssi effect on multi story reinforced concrete rc frame founded on soft soil flexible base is made and compared with fixed base. The starting point for this work was decades of available soilstructure interaction research, and recently published engineering guidance for static analysis procedures. The behavior of soil is predicted based on the engineering properties of soil, vertical soil profile and the alignment of ground surface. A simple soilstructure interaction model sciencedirect. One problem with modelling a soilstructure interaction using a full feanalysis of the soil is that it requires a large amount of computational e ort along with a signi cant e ort in building the models, and a rather deep understanding of soil modelling. To the writers knowledge, it is luco and contesse 6 in 1973 to come up first with the structure soil structure interaction designation for this area of study. Does anybody know a good software for modelling soil. It is very important to note that the structural response is mainly due to the soilstructure interaction forces that brings an impact on the structure. Studies on soil structure interaction of multi storeyed. Soilstructure interaction effects, analysis and applications in design the study of soil structure interaction ssi is related to the field of earthquake engineering. I need to model the effect on the basic acceleration on field by the existence of near constructions. Soilstructure interaction plays an important role in the behavior of structure.
This beneficial effect of site soils is as a result of lengthening of the. It influences the behavior of soil, as well as the response of pile under loading. For this reason commercial software programs are available for conducting calculations regarding the soilstructure interaction. Four different structures and three different sites were analyzed under two different input motions. Lusas software for bridge and structural applications.
Two model 2d rc frames with 7 and 12 story are selected for analysis. In this load transfer mechanism, the characteristics of soil has very important role. Modeling and analysis of regular building and building out and with considering soil structure interaction with different types of soils. Lpile analysis of piles and drilled shafts under lateral. Effect of soilstructure interaction in seismic analysis.
Soilstructure interaction 20190 university of surrey. Structuresoilstructure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multistructure system through soilground. Dynamic soilstructureinteraction analysis of structures in. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. 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. Midas soil structure interaction analysis for deep excavations with piled raft. Technical paper soilstructure institution of civil. Aggregation is the result of the interaction of soil particles through rearrangement, flocculation and cementation. At the conclusion of the module, you will be in a better position to judge what level of model may be appropriate for a given situation, and what information will be required in order to set up the analysis. Any idea about the software for the soil structure interaction. We note that this kind of analysis ignores the footingfooting interaction effects. Soilstructure interaction ssi analysis evaluates the collective response of three.
Sgh performs soil structure interaction ssi analyses to evaluate the true responses of these systems. Aug 20, 2012 to simulate the interaction between a structure and soil you can apply interface elements. Understanding soil types and soil texture test your own soil duration. It was first developed at the university of californiaberkeley in 1981. Based on the proposed model, a general computer software is developed. Does anybody know a good software for modelling soil structure interaction. The analysis is highly essential for predicting a more accurate structural behavior so as to improve the safety of structures under extreme loading conditions. Soilstructure interaction can affect structural response to wind depending on the type of structure, its foundation and the type of response. Some structures where ssi is especially important are buildings, bridges and oil rigs. Estimating total system damping for soil structure interaction systems farhang ostadan,a nan deng,b and jose m. Every type of soil is marked by a specific color in column b.
Without an interface the structure and the soil are tied together. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force, load, displacements etc. This effect causes the load over the structure to be larger than the heigth of soil above her for flexible structures. 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. Geotechnical and soilstructure interaction analysis. He has practised in both structural and geotechnical engineering. A realistic model of structure and soil interaction can lead to an optimal and economical structure. Ground structure interaction ssi consists of the interaction between soil ground and a structure built upon it. Flush a computer program for approximate 3d analysis of.
The mechanical behavior of structures that are in contact with soil is a ected by the interaction between the soil and the structure. In my model i simulate the backfill process using killalive elements command. Analysis of soilstructure interaction mechanisms on. A study of soil structure interaction is essential for the design of group pile foundations, slopes with structural reinforcements, and seismic analysis of highrise buildings and the substructures of multispan bridges.
Feb 29, 2012 the natural eigen frequency of the soil layer without footing which is 18. Problems associated with practical application of ssi for building structures are rooted in a poor understanding of fundamental ssi principles. Various combinations of soil and structure can either. The result obtained that the interaction effect increases time period of both buildings base shear and lateral displacement of the structures. Plane82 for soil, plane183 for concrete, conta172 and targe169 for soil structure interaction ssi. All buildings need a foundation that supports the structure. Lusas is used by engineers worldwide for all types of soilstructural interaction modelling these case studies show illustrative uses of the software, with the most recently added article at the top. 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.
Conventionally, the soil foundation structure interaction effects for bridges supported on large gravity type caissons have been considered by using the substructure methods i. Soil structure interaction modelling slope stability. Elastoplastic soil spring methods with active and passive soil springs. Structure soil structure interaction sssi, put forward in recent decades, means the dynamic interaction problem among the multi structure system through soil ground. The program computes deflection, bending moment, shear force and soil response over the length of the pile. By using an interface, node pairs are created at the interface of structure and soil. Study of soil structure interaction due to seismic load having vertical irregularity with different types of soils viz. The hyperlinks below, present the concepts and techniques associated with modeling soil structure interaction. Applicaiton of the computer program sassi for seismic ssi. Iii soil structure interaction soil structure interaction affects the distribution of pressure between foundation and soil. View which model is better for soil structure interaction in sap. Soil structure interaction can affect structural response to wind depending on the type of structure, its foundation and the type of response. S presentation outline purpose of presentation linear versus nonlinear seismic ssi nonlinear seismic soil structure interaction nlssi studies the nlssi introduction nonlinearity in seismic ssi analysis commercial software elements commercial software nonlinear constitutive models nonlinear seismic ssi damping demonstration of time domain 2d model.
The interaction effects are investigated for variable distance between the two buildings. Deepex is the only software that can easily assess the damage potential of ajdacent buildings next to an excavation. Soil structure interaction arash khosravifar fugro consultants, inc. Soilstructure interaction for building structures nist. Does anybody know a good software for modelling soil structure. The concept of structure soil structure dynamic interaction was introduced, and the research methods were discussed. Structure soil structure interaction effects are apparent in fig. Soilstructure interaction ssi analysis is a special field of earthquake engineering. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc. A new interactive computer code is presented in this paper for dynamic and soil structure interaction ssi analyses. For buildings, the gust factor is affected very little but total response to gusting wind is increased. Soil structure interaction and seismic design code provision even though the soil has good engineering characteristics 3. Soil structure interaction between two adjacent buildings. Modelling the interaction between structure and soil for.