This method is rarely used in practice as it involves large computation and is very complex to analyze. 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. The report further illustrate the resonance vibration of building and variation in nature of design. Influence of foundation type on seismic performance of.
Soilstructure interaction and optimum seismic design of. 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. 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. Design, analysis and soilstructure interaction of an intze. Seismic analyses and design of foundation soil structure interaction. Iaea tecdoc on seismic soil structure interaction for design. 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. Dynamic analysis of soil structure interaction effect on. The seismic design of nuclear facilities should be conservativeand seismic risk calculations. 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. The research work on the seismic soilstructure interaction in the time domain was carried out at the department of civil engineering, university of canterbury. Illustration of direct analysis of soil structure interaction with the help of finite elements. Bridge approach embankments and fills through which cutandcover tunnels are constructed should be designed to remain stable during the design seismic event because.
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. It is becoming widely accepted that the seismic design and analysis of structures should take the ssi effect into consideration. Interaction system 21a for soilstructure interaction analysis 22. Seismic soilstructure interaction in the time domain. The soil structure interaction effect considerably influence the design of multi storey buildings subjected to lateral seismic load. Carr, the main supervisor of the research project, and dr. Such analyses become more complex when soils supporting the bridge foundations are liquefiable and the effects of soil liquefaction need to be considered. 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. Impact of soil structure interaction on the seismic design of reinforced concrete buildings with underground stories.
The soil structure interaction activity is divided into two parts. Version 526 09jan2018 apbjjj iaea tecdoc on seismic soil structure interaction for design and assessment of nuclear installations pecker, johnson, jeremic. 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. 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. Effect of soilfoundationstructure interaction and pier.
The effects of soil flexibility are mostly ignored in seismic design of buildings leading to unnecessarily costly or. Soilstructure interaction ssi response analysis for a traditional spra uses linear geometric properties soil and structure are glued together i. Sassi system for analysis of soil structure interaction. Pdf in current design office practice, a commonly used modelling assumption is that the base of a building structure can be idealised with. The idealised design spectra of the codes along with the increased fundamental period and effective damping. Kinematic soilstructure interaction effects from building. Performance based seismic design of rc building with. 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. Firstly, the way current seismic provisions treat ssi effects is briefly discussed. His expertise is on geotechnics, soil dynamics and earthquake engineering, including mainly. This is especially applicable to areas of seismic activity. Effect of soilstructure interaction in seismic analysis. Generally direct or impedance method is used for ssi seismic analysis. 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.
In the dynamic analysis approach, a dynamic soil structure interaction is conducted using numerical analysis tools such as. 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. 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. Seismic soil structure interaction for design and assessment of nuclear installations pecker, johnson, jeremic table of contents table of contents i 1. Keywords performance based seismic design, soil structure interaction, time history analysis, natural period, storey shear, storey drift ratio. Seismic soilstructure interaction in performancebased.
Effect of soilstructure interaction on seismic isolated bridges. A boundary zone model developed to account for the nonlinearity. Seismic design and analysis of underground structures. The process of soil response influencing motion of the structure and viceversa is termed as soilstructure interaction ssi. This paper is about the interaction of soil with structure isfsi support pad during a seismic event. Soilstructure interaction under earthquake loading. Coupling between soil and structure behaviour, role of embedded massive. 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. In this paper, a typical reactor building rb is chosen for a case study to investigate the potential benefit of accounting for ssi effects.
Optimum lateral load distribution for seismic design of. 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. The state of the art on soilpilestructure interaction is summarized, and focus on the practical applications in seismic design. Nghiem, soilpilestructure interaction effects on high rises under seismic shaking ph. Modelling soilstructure interaction in dynamic analysis falls into. An investigation of the effects of soil structure interaction on the stresses and displacements in the structure and the soil of a model. Influence of soilstructure interaction on seismic collapse resistance.
Seismic analyses and design of foundation soil structure. Groundstructure interaction ssi consists of the interaction between soil ground and a structure built upon it. Soilstructure interaction effects on seismic response of a. Soil structure interaction and seismic design code provision even though the soil has good engineering characteristics 3. The first example concerns with the seismic design of the foundation of. Seismic soil structure interaction for design and assessment of nuclear installations. Effect of soilstructure interaction on the seismic fragility. Chen, computer simulation of the dynamic layered soilpilestructure interaction system, can. 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. Case study seismic design and soilstructure interaction of a.
Soilstructure interaction of the messina bridge to validate its seismic behaviour. Beneficial and detrimental effects of soilstructure. Seismic design of foundation regulation en1998part 5 extension of ec82004 10 states that ssi. Ground motions at the foundation levels of structures differ from those in the freefield as a result of inertial and kinematic interaction effects.
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. European regulation for seismic design of structures cen, 2004b. 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. Reinforced concrete supporting pad design for an isfsi and. 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. Pdf soil structure interaction and seismic design code provision. Effect of soilstructure interaction on the seismic. Plane strain dynamic analyses including simplified description of the bridge towers. Iaea tecdoc on seismic soil structure interaction for.
Chapter 6 seismic design page 62 geotechnical design manual m 4603. Three main issues are identified and investigated in this research. Soil structure interaction and seismic design code provision. 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. The role of soil structure interaction ssi in the seismic response of structures is reexplored using recorded motions and theoretical considerations. Pdf effect of soilstructure interaction on seismic. Tentative framework for development of advanced seismic design criteria for new buildings pdf 15mb. It has been suggested that ignoring ssi in design practice leads to a conservative design.
The report discusses special design issues, including the design of tunnel segment joints and joints between tunnels and portal structures. Soil structure interaction is analyzed for such buildings under construction. Seismic design and postclosure performance assessment of a geologic repository at. Inertial interaction effects tend to produce narrowbanded ground motion modification near the fundamental period of the soilstructure system. Ssi has been traditionally considered to be beneficial to seismic response of a structure. The state of the art on soil pile structure interaction is summarized, and focus on the practical applications in seismic design. Seismic soilstructure interaction analysis of ventilation. Soilstructure interaction for the seismic design of the.
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. In the following analysis the flexibility of foundation is being taken into account by replacing the foundation of soil with springs that are equivalent. 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. 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. 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. Seismic soilpilestructure interaction experiments and analyses.
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. Use of highstrength reinforcement in earthquakeresistant concrete structures pdf 9. Soilstructure interaction effects on seismic response of. Soilstructure interaction considerations in seismic. Moss, the cosupervisor of the research project, for. The dynamic response of a structure during an earthquake depends on the.
Seismic soilstructure interaction studies on tall chimneys. The process of soil response influencing motion of the structure and viceversa is termed as soil structure interaction ssi. Comparative assessment of soilstructure interaction regulations of. This phenomenon has played an important role in assessing.
Soilstructure interaction modelling for piles in performance. Foundations layout, soil properties and evaluation of the liquefaction potential. Seismic soilstructure interaction analysis of ventilation stack structure. Soilstructure interaction for building structures nehrp. Effects on displacementbased pushover analysis initial seismic demand freefield reduced seismic demand sfsi effects. The role of soilstructure interaction ssi in the seismic response of structures is reexplored using recorded motions and theoretical considerations. Pdf significance of soilstructure interaction in seismic response. Journal of geotechnical and geoenvironmental engineering september 1999. In this study, the effects of soilpilestructure interaction spsi forces on the seismic response of two tall and massive building projects were. Pdf nonlinear soilstructureinteraction analysis in. Reduction in design base shear due to ssi according to nehrp97 seismic code.
Modelling soil structure interaction in dynamic analysis falls into. Consequently, such load patterns may not be suitable for seismic design of non linear flexible base structures. However, seismic design standards hardly provide any. Effect of soilstructure interaction in seismic analysis of. 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. The precise quantification of the risk within the seismic probabilistic risk assessment framework depends considerably on an accurate treatment of the seismic response analysis. For design purpose, the envelope of the variations is used. 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. Geotechnics, soil dynamics and earthquake engineering, including mainly. However, several issues still remain regarding the application of these procedures to inelastic multistorey buildings.
Various combinations of soil and structure can either. 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. Case study seismic design and soilstructure interaction. 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. This report documents the current stateofpractice in soilstricture interaction analyses for seismic design of bridges. Substructure approach in soil structure interaction. Soilstructure interaction, dynamic behavior of soil, seismic design, damping, vibration period, spectral. 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.
The lateral load distributions specified by seismic design provisions are primarily based on. Soil structure interaction for building structures pdf mb. 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. This paper describes the performancebased design of the replacement wharf, including the following key aspects. Soil structure interaction of bridges for seismic analysis. Soil pile structure interaction in seismic design yingcai han feic, technical director, fluor, vancouver, canada yingcai. Seismic soil structure interaction analysis of ventilation stack structure. Seismic design of foundation regulation en1998part. Soilstructure interaction effects on seismic behaviour of reinforced. Effect of soilpilestructure interaction on seismic design of tall. 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.
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