Soil structure interaction

About: Soil structure interaction is a research topic. Over the lifetime, 3653 publications have been published within this topic receiving 48890 citations.

Structural Control Including Soil‐Structure Interaction Effects

Abstract: The effects of soil‐structure interaction on the form of the control rule and on the effectiveness of active control of the seismic response of structures are examined. The structure is modeled as a uniform shear beam supported on a rigid foundation embedded in an elastic soil. The seismic excitation is represented by vertically incident shear waves. Active control in the form of an absorbing boundary located at the top of the structure is considered. The active absorbing boundary cancels the reflection of waves at the top of the structure and eliminates resonance within the superstructure. It is found that the form of the control rule changes as a result of the rocking of the foundation associated with the kinematic and inertial interaction. However, the effectiveness of this form of active control remains unchanged or is improved when soil‐structure interaction effects are included.

Seismic site characterization for nuclear structures and power plants

Abstract: Seismic site characterization is carried out for the co nstruction of nuclear structures and power plants in earthquake-prone areas to establish the occurrence of severe seismic hazards such as tectonic rupture, surface faulting, large scale liquefaction, sliding and seismic settlement which may alter the overall stability of the site. Seismic characterization is required to finalize the design earthquake parameters including choosing input seismic data. As a part of the investigation, mea surements of relevant dynamic parameters both in laboratory and in situ have been made for carrying out dynamic soil structure interaction analysis, for dete rmination of dynamic deformation, seismic settlement and dynamic response spectrum of the site, and for calculating dynamic earth pressure acting on retaining structures. We discuss here the seismic investigation components and methods, measurement of P- and S-wave velocities in the field and estimation of important dynamic parameters such as maximum shear modulus, modulus reduction curve, damping ratio, seismic site classific ation, predominant site period, liquefaction analysis through case studies for nuclear structures at Ka lpakkam and Kudankulam and power plant structures at New Delhi and Konaseema. GEOTECHNICAL site investigations in seismically active regions should include gathering of information about the physical nature of the site and its environment that will allow an adequate evaluation of seismic hazard. The scope of the investigation will be a matter of professional judgement, depending on the seismicity of the area and nature of the site as well as of the proposed or existing construction. In addition to the effects of local soil conditions upon the severity of ground motion, the investigation should cover possible earthquake danger from geological or other cons equential hazards such as fault displacement, subsidence, liquefaction, landslides, mudflows, etc. In this paper, var ious components and methods of seismic site characteri zation for nuclear structures and power plants are discussed through case studies: Prototype Fast Bre eder Reactor (PFBR) site and Spent Fuel Storage Facility (SFSF) site, Kalpakkam (TN); Atomic power project site, Kudankulam (TN); Pragati power project site, New Delhi; and combined cyclic power plant, Konaseema (AP). Investigation components and methods The major components of investigation specified here are particularly pertinent to the conceptual earthquake -resistant design of nuclear structures and power plants to be built in an earthquake zone.