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.

FE Analyses: Compaction-Induced Stresses and Deformations

Abstract: Analytical models and a finite element analysis methodology are presented for evaluation of compactioninduced soil stresses and resulting soilstructure interaction effects. These analytical methods...

Dynamic stiffness of pile in a layered elastic continuum

Abstract: A set of formulas for the dynamic stiffness of a pile (spring and dashpot coefficients) to use in inertial interaction analysis is proposed, utilising elastodynamic solutions. The method is based on solving a Lagrangian system of coupled equations for the pile and the soil motions for a range of vibration frequencies and also by considering the vertical, radial and angular stresses on the pile–soil interface. The solution extensively uses Bessel functions of the second kind and results are compared with finite-element models and field pile load tests. A dimensionless frequency related to the well-known active length of pile is proposed to separate inertial and kinematic interactions. A formula is also proposed for estimation of the active length of a pile in a two-layered soil. A specific depth is introduced beyond which soil layering does not have any appreciable effects on dynamic stiffness. It is commonly (rather arbitrarily) assumed that the first natural frequency of soil strata differentiates radiat...

Evaluation of soil–foundation–structure interaction effects on seismic response demands of multi-story MRF buildings on raft foundations

Abstract: Soil conditions have a great deal to do with damage to structures during earthquakes. Hence the investigation on the energy transfer mechanism from soils to buildings during earthquakes is critical for the seismic design of multi-story buildings and for upgrading existing structures. Thus, the need for research into soil–structure interaction (SSI) problems is greater than ever. Moreover, recent studies show that the effects of SSI may be detrimental to the seismic response of structure and neglecting SSI in analysis may lead to un-conservative design. Despite this, the conventional design procedure usually involves assumption of fixity at the base of foundation neglecting the flexibility of the foundation, the compressibility of the underneath soil and, consequently, the effect of foundation settlement on further redistribution of bending moment and shear force demands. Hence the SSI analysis of multi-story buildings is the main focus of this research; the effects of SSI are analyzed for typical multi-story building resting on raft foundation. Three methods of analysis are used for seismic demands evaluation of the target moment-resistant frame buildings: equivalent static load; response spectrum methods and nonlinear time history analysis with suit of nine time history records. Three-dimensional FE model is constructed to investigate the effects of different soil conditions and number of stories on the vibration characteristics and seismic response demands of building structures. Numerical results obtained using SSI model with different soil conditions are compared to those corresponding to fixed-base support modeling assumption. The peak responses of story shear, story moment, story displacement, story drift, moments at beam ends, as well as force of inner columns are analyzed. The results of different analysis approaches are used to evaluate the advantages, limitations, and ease of application of each approach for seismic analysis.