Seismic soil structure interaction for design and assessment of nuclear installations. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. The purpose of this study is to investigate the soil structure interaction ssi effect on the overall risk of a pwr containment building structure with respect to two failure modes. However during seismic loading the soil undergoes deformations which are imposed to the foundation, the question naturally arises of knowing if the motion in the vicinity of the structure is altered by the presence of the structure and how the structure response is modified by the compliance of the supporting soil. Geotechnics, soil dynamics and earthquake engineering, including mainly. Inertial interaction effects tend to produce narrowbanded ground motion modification near the fundamental period of the soilstructure system. In the following analysis the flexibility of foundation is being taken into account by replacing the foundation of soil with springs that are equivalent. In this paper, a typical reactor building rb is chosen for a case study to investigate the potential benefit of accounting for ssi effects.
An investigation of the effects of soil structure interaction on the stresses and displacements in the structure and the soil of a model. The soil structure interaction is done by importing the analysis from etabs to ansys and then the uplift pressure of the soil to the structure is studied. Sassi system for analysis of soil structure interaction. This report documents the current stateofpractice in soilstricture interaction analyses for seismic design of bridges. Tentative framework for development of advanced seismic design criteria for new buildings pdf 15mb. Performance based seismic design of rc building with. Illustration of direct analysis of soil structure interaction with the help of finite elements. Consequently, such load patterns may not be suitable for seismic design of non linear flexible base structures. Keywords performance based seismic design, soil structure interaction, time history analysis, natural period, storey shear, storey drift ratio. Effect of soilstructure interaction in seismic analysis of. The research work on the seismic soilstructure interaction in the time domain was carried out at the department of civil engineering, university of canterbury. In order that the building responds to such movements it must be in a position to conquer inertia of its own that leads to an interaction between the building and the associated soil. Seismic design and analysis of underground structures. Soilstructure interaction and optimum seismic design of.
Seismic soilstructure interaction in performancebased. Substructure approach in soil structure interaction. Soil structure interaction effects on seismic design of baseconnection for cablestayed bridge towers mohamed omar1, and toshiro hayashikawa2 abstract an incremental iterative finite element technique for a more realistic dynamic analysis of nonlinear soilfoundationsuperstructureanchor bolts system subjected to earthquake ground motion is. The lateral load distributions specified by seismic design provisions are primarily based on. Implication of soil structure interaction effects helps the designer to assess the inertial forces and real displacements of the soil foundation structure system exactly under the influence of free field motion. Such analyses become more complex when soils supporting the bridge foundations are liquefiable and the effects of soil liquefaction need to be considered. Modelling soil structure interaction in dynamic analysis falls into. This is especially applicable to areas of seismic activity. It has been suggested that ignoring ssi in design practice leads to a conservative design. The state of the art on soil pile structure interaction is summarized, and focus on the practical applications in seismic design. The role of soil structure interaction ssi in the seismic response of structures is reexplored using recorded motions and theoretical considerations. The purpose of this study is to investigate the soilstructure interaction ssi effect on the overall risk of a pwr containment building structure with respect to two failure modes. The soil structure interaction analysis results of the hypothetical waste handling facility reported herein showed significant influence of the geologic profiles of the foundation medium and their geotechnical and dynamic properties on the seismic structural response of the facility. Comparative assessment of soilstructure interaction regulations of.
Ssi provisions of seismic design codes are optional and allow designers to reduce the design base shear of buildings by considering soil structure interaction ssi as a beneficial effect. Effect of soilstructure interaction on the seismic fragility. My reasons and purposes for undertaking this project when simulating an earthquake, the structure should not only be tested using records registering in the free field of soil. The seismic response of midrise frame structures rested on soft soils is susceptible to the dynamic interaction between structure, foundation and soil, called soil structure interaction ssi. Influence of foundation type on seismic performance of. In this study, the effects of soilpilestructure interaction spsi forces on the seismic response of two tall and massive building projects were. The first example concerns with the seismic design of the foundation of. Effect of soilstructure interaction on the seismic. Soil structure interaction for building structures pdf mb. Seismic soilstructure interaction analysis of ventilation stack structure. Case study seismic design and soilstructure interaction of a.
Soil structure interaction ssi procedures for performancebased seismic design of building structures have been in existence in design guidelines and provisions for decades. Pdf impact of soil structure interaction on the seismic. If this situation is faced, rigorous treatment of soilstructure interaction requires that the effective foundation input motion be calculated, an additional step in the design. Soft soil sediments can significantly elongate the period of seismic waves and the increase in natural period of structure may lead to the resonance with the long period ground vibration. Design, analysis and soilstructure interaction of an intze. However, seismic design standards hardly provide any. The process of soil response influencing motion of the structure and viceversa is termed as soil structure interaction ssi. Iaea tecdoc on seismic soil structure interaction for. The report discusses special design issues, including the design of tunnel segment joints and joints between tunnels and portal structures. The ground motion topic includes seismic hazard analyses, seismic performance criteria, spectrum compatible time history, spatial variation of ground motions, effects of local soil condition, and the recent atc32 recommendations on standard ars acceleration response spectrum design criteria. The role of soilstructure interaction ssi in the seismic response of structures is reexplored using recorded motions and theoretical considerations. Seismic analyses and design of foundation soil structure interaction. The soil structure interaction activity is divided into two parts. Soil structure interaction and seismic design code provision even though the soil has good engineering characteristics 3.
Reduction in design base shear due to ssi according to nehrp97 seismic code. Seismic soil structure interaction analysis of ventilation stack structure. Journal of geotechnical and geoenvironmental engineering september 1999. Soilstructure interaction effects on seismic behaviour of reinforced. Seismic design of foundation regulation en1998part 5 extension of ec82004 10 states that ssi. Bridge approach embankments and fills through which cutandcover tunnels are constructed should be designed to remain stable during the design seismic event because. Soilstructure interaction for building structures nehrp. Case study seismic design and soilstructure interaction. Dynamic analysis of soil structure interaction effect on. The effects of soil flexibility are mostly ignored in seismic design of buildings leading to unnecessarily costly or. Pdf nonlinear soilstructureinteraction analysis in.
The soil structure interaction effect considerably influence the design of multi storey buildings subjected to lateral seismic load. Soilstructure interaction considerations in seismic. This paper is about the interaction of soil with structure isfsi support pad during a seismic event. Reinforced concrete supporting pad design for an isfsi and. Soilstructure interaction effects on seismic response of a. Effect of soilstructure interaction on seismic isolated bridges. Ssi has been traditionally considered to be beneficial to seismic response of a structure. Seismic soilstructure interaction analysis of ventilation.
The idealised design spectra of the codes along with the increased fundamental period and effective damping. Firstly, the way current seismic provisions treat ssi effects is briefly discussed. Iaea tecdoc on seismic soil structure interaction for design. Ground motions at the foundation levels of structures differ from those in the freefield as a result of inertial and kinematic interaction effects. Seismic soilstructure interaction in the time domain. Optimum lateral load distribution for seismic design of. Nonlinear soilstructureinteraction analysis in support of seismic design and probabilistic risk assessment of nuclear facilities technical report pdf available december 2018 with 1,572 reads. In the dynamic analysis approach, a dynamic soil structure interaction is conducted using numerical analysis tools such as. Chen, computer simulation of the dynamic layered soilpilestructure interaction system, can. Soilstructure interaction, dynamic behavior of soil, seismic design, damping, vibration period, spectral. Mar 05, 2018 one major aspect of conservatism in the design is ignoring the effect of soil structure interaction ssi, which results in conservative estimates of seismic demands for plant equipment. Foundations layout, soil properties and evaluation of the liquefaction potential. Seismic analyses and design of foundation soil structure. Seismic design and postclosure performance assessment of a geologic repository at.
Carr, the main supervisor of the research project, and dr. This method is rarely used in practice as it involves large computation and is very complex to analyze. Kinematic soilstructure interaction effects from building. It covers several relevant areas such as ground motion aspects, various issues on soilstructure interaction for typical foundations and methods of substructuring to reduce the number of degrees of freedom for foundation elements. The state of the art on soilpilestructure interaction is summarized, and focus on the practical applications in seismic design. Soilstructure interaction of the messina bridge to validate its seismic behaviour. The dynamic response of a structure during an earthquake depends on the. Generally direct or impedance method is used for ssi seismic analysis.
Soilstructure interaction under earthquake loading. Seismic design of foundation regulation en1998part. This phenomenon has played an important role in assessing. Soilstructure interaction effects on seismic response of. Soil structure interaction seismic ssi is a key factor that has to be considered in design, particularly for retaining structures and structures with deep foundations, such as jetties. Chapter 6 seismic design page 62 geotechnical design manual m 4603. Version 526 09jan2018 apbjjj iaea tecdoc on seismic soil structure interaction for design and assessment of nuclear installations pecker, johnson, jeremic. For design purpose, the envelope of the variations is used.
The main idea behind the provisions is that the soil structure system can be replaced with an equivalent fixedbase model with a longer period and usually a. Influence of soilstructure interaction on seismic collapse resistance. His expertise is on geotechnics, soil dynamics and earthquake engineering, including mainly. The seismic design of nuclear facilities should be conservativeand seismic risk calculations. Interaction system 21a for soilstructure interaction analysis 22. Initial seismic demand should be drawn for foundation motion, not freefield spectral ordinates should reflect system damping ratio pushover curve soil springs in pushover analysis c. A boundary zone model developed to account for the nonlinearity. Pdf significance of soilstructure interaction in seismic response. Modelling soilstructure interaction in dynamic analysis falls into. Implication of soilstructure interaction effects helps the designer to assess the inertial forces and real displacements of the soilfoundation structure system exactly under the influence of free field motion. However, several issues still remain regarding the application of these procedures to inelastic multistorey buildings. Seismic soilpilestructure interaction experiments and analyses. The main idea behind the provisions is that the soilstructure system can be replaced with an equivalent fixedbase model with a longer period and usually a. Seismic soil structure interaction for design and assessment of nuclear installations pecker, johnson, jeremic table of contents table of contents i 1.
Moss, the cosupervisor of the research project, for. Case study seismic design and soilstructure interaction of a critical wharf facility in soft soils 2 a replacement wharf has been designed which will replace the existing wharf. It is becoming widely accepted that the seismic design and analysis of structures should take the ssi effect into consideration. Nghiem, soilpilestructure interaction effects on high rises under seismic shaking ph. Introduction the effects of soil structure interaction ssi shall be considered in seismic design of nuclear facilities, if the foundation materials are not a rock or rocklike soil to support structures. Effect of soilfoundationstructure interaction and pier. European regulation for seismic design of structures cen, 2004b. 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. Pdf effect of soilstructure interaction on seismic. Soilstructure interaction for the seismic design of the. Effects on displacementbased pushover analysis initial seismic demand freefield reduced seismic demand sfsi effects. The precise quantification of the risk within the seismic probabilistic risk assessment framework depends considerably on an accurate treatment of the seismic response analysis.
Soilstructure interaction ssi response analysis for a traditional spra uses linear geometric properties soil and structure are glued together i. Impact of soil structure interaction on the seismic design of reinforced concrete buildings with underground stories. Seismic soilstructure interaction studies on tall chimneys. The process of soil response influencing motion of the structure and viceversa is termed as soilstructure interaction ssi. Ssi provisions of seismic design codes are optional and allow designers to reduce the design base shear of buildings by considering soilstructure interaction ssi as a beneficial effect. Soilstructure interaction seismic ssi is a key factor that has to be considered in design, particularly for retaining structures and structures with deep foundations, such as jetties. Use of highstrength reinforcement in earthquakeresistant concrete structures pdf 9. Plane strain dynamic analyses including simplified description of the bridge towers. Soilstructure interaction modelling for piles in performance. Pdf on dec 11, 2015, sagar karki chhetri and others published soil structure interaction and seismic design code provision find, read and cite all the. Soil pile structure interaction in seismic design yingcai han feic, technical director, fluor, vancouver, canada yingcai. Three main issues are identified and investigated in this research. Current seismic design provisions allow engineers to completely ignore the effects of soil structure interaction in the seismic analysis of buildings, or to consider them by reducing the design base shear of the fixedbase structure e. Pdf in current design office practice, a commonly used modelling assumption is that the base of a building structure can be idealised with.
Soil structure interaction is analyzed for such buildings under construction. Pdf soil structure interaction and seismic design code provision. Effect of soilstructure interaction in seismic analysis. Soil structure interaction and seismic design code provision.
This paper describes the performancebased design of the replacement wharf, including the following key aspects. The lateral load distributions specified by seismic design provisions are primarily based on elastic behaviour of fixed base structures without considering the effects of soil structure interaction ssi. While modeling and analyzing the water tank and columns in ansys, many limitation of the software is seen which will the discussed later in the chapters. Coupling between soil and structure behaviour, role of embedded massive. The report further illustrate the resonance vibration of building and variation in nature of design. Various combinations of soil and structure can either. Soil structure interaction of bridges for seismic analysis. Beneficial and detrimental effects of soilstructure.
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