What is soil structure interaction analysis?
Ground–structure interaction (SSI) consists of the interaction between soil (ground) and a structure built upon it. The process in which the response of the soil influences the motion of the structure and the motion of the structure influences the response of the soil is termed as soil-structure interaction (SSI).
How do you model soil structure interactions?
A simple three-dimensional soil–structure interaction (SSI) model is proposed. First, a model is developed for a layered soil medium. In that model, the layered soil medium is divided into thin layers and each thin layer is represented by a parametric model.
What is inertial interaction?
The effect of inertia of the structure on the overall system is called inertial interaction. The inertial loads exerted on the structure result in base shear and an overturning moment on the foundation level, which in turn cause relative displacement between the foundation and the free-field [10].
What is soil structure interface?
The phenomenon is described by a mathematical model of interface behaviour which employs the concepts of directional dependence and rheological interpolation. The element tests used in that approach are direct shear tests at constant normal stress, at constant volume, and (pseudo) oedometers.
What is Winkler model?
Winkler Model ➢ Winkler’s idealization represents the soil medium as a. system of identical but mutually independent, closely. spaced, discrete, linearly elastic springs. ➢ According to this idealization, deformation of foundation. due to applied load is confined to loaded regions only.
What are the limitations of Winkler model?
Limitations of the Winkler Method As the springs are independent and do not interact, the deformation of the ground is constricted in the loaded region, an assumption that is unrealistic since the soil is a continuous material as it deforms as depicted in Figure 3.
What is the scope of soil foundation interaction analysis?
Conventional design practice for ordinary structures usually neglect soil-structure interaction effects, but for important structures it may be considered in the design. The scope of soil-structure interaction includes retaining walls, buried pipe lines, bridge abutments, tunnels etc.
What is a Winkler spring?
➢ Winkler’s idealization represents the soil medium as a. system of identical but mutually independent, closely. spaced, discrete, linearly elastic springs. ➢ According to this idealization, deformation of foundation. due to applied load is confined to loaded regions only.
What is a Winkler foundation?
The Winkler foundation is a simple model widely used for decades to account for the surface response of elastic bodies. It models the response as purely local, linear, and perpendicular to the surface.
What is subgrade reaction?
The subgrade reaction is the resistance from peripheral ground layers. It is a reaction force which depends on the ground displacement. It is assumed to be proportional to ground displacement with a proportionality factor that depends on the ground stiffness and lining dimensions (Fig. 3.15).
What are the criteria for shallow and deep foundation?
A shallow foundation can be constructed in as little as a one-foot depth, whereas a deep foundations is formed at a depth of 10-300 feet. As such, a shallow foundation is used for projects that are small or lighter-weight buildings, and deep foundations for larger or hillside developments, or those on poor soil.
What are the limitations of Winkler’s model?