The effect of soil-structure interaction on a single-storey, two-bay space frame resting on a pile group embedded in the cohesive soil (clay) with flexible cap is examined in this paper. For this purpose, a more rational approach is resorted to using the finite element analysis with realistic assumptions. Initially, a 3-D FEA is carried out independently for the frame on the premise of fixed
column bases in which members of the superstructure are discretized using the 20-node isoparametric continuum elements. Later, a model is worked out separately for the pile foundation, by using the beam elements, plate elements and spring elements to model the pile, pile cap and soil, respectively. The stiffness obtained for the foundation is used in the interaction analysis of the frame to quantify the effect of soil-structure interaction on the response of the superstructure. In the parametric study using the substructure approach (uncoupled analysis), the effects of pile spacing, pile configuration, and pile diameter of the pile group on the response of superstructure are evaluated. The responses of the superstructure considered include the displacement at top of the frame and moments in the columns. The effect of soilstructure interaction is found to be quite significant for the type of foundation considered in the study. Fair agreement is observed between the results obtained herein using the simplified models for the pile foundation and those existing in the literature based on a complete three dimensional analysis of the
building frame - pile foundation - soil system.

https://www.techno-press.org/download.php?journal=imm&volume=3&num=1&ordernum=4

Building frame - pile foundation - soil interaction analysis: a parametric study

A stiffness matrix for a beam on elastic foundation finite element and element load vectors due to concentrated forces, concentrated moments, and linearly distributed forces are developed for plane frame analysis. This element stiffness matrix can be readily adopted for the conventional displacement method. For the force method, an element flexibility matrix and element displacement vectors due to the aforementioned loads are also presented. Whereas most other analyses of a beam on elastic foundation finite element approximate the foundation by discrete springs or by cubic hermitian polynomials, the present stiffness and flexibility matrices are derived from the exact solution of the differential equation. Thus, results of this finite element analysis are exact for Navier and Winkler assumptions. Numerical examples are given to demonstrate the efficiency and simplicity of the element.

Beam on Elastic Foundation Finite Element

Modelling the response of cyclically loaded bridge columns embedded in warm and seasonally frozen soils

The effect of soil-structure interaction on a simple single storeyed and two bay space frame resting on a pile group embedded in the cohesive soil (clay) with flexible cap is examined in this paper. For this purpose, a more rational approach is resorted to using the three dimensional finite element analysis with realistic assumptions. The members of the superstructure and substructure are descretized
using 20 node isoparametric continuum elements while the interface between the soil and pile is modeled using 16 node isoparametric interface elements. Owing to viability in terms of computational resources and memory requirement, the approach of uncoupled analysis is generally preferred to coupled analysis of the system. However, an interactive analysis of the system is presented in this paper where the building frame and pile foundation are considered as a single compatible unit. This study is focused on the
interaction between the pile cap and underlying soil. In the parametric study conducted using the coupled analysis, the effect of pile spacing in a pile group and configuration of the pile group is evaluated on the
response of superstructure. The responses of the superstructure considered include the displacement at top
of the frame and moments in the superstructure columns. The effect of soil-structure interaction is found to be quite significant for the type of foundation used in the study. The percentage variation in the values of displacement obtained using the coupled and uncoupled analysis is found in the range of 4-17 and that for the moment in the range of 3-10. A reasonable agreement is observed in the results obtained using either approach.

http://www.techno-press.org/download.php?journal=imm&volume=2&num=4&ordernum=4

Building frame-pile foundation-soil interactive analysis

Influence of soil-structure interaction (SSI) on optimal design of passive damping devices

Two methods are described in which the response of plane, framed structures to load can be assessed by accounting for superstructure and substructure as a single compatible unit. Both methods are based on the assumption of linear-elastic behavior in superstructure and raft. The Winkler model is used to represent the behavior of the soil beneath the raft. The first method uses equilibrium equations to describe separately the response of structure and raft. Sufficient relationships to solve the complete problem are obtained by adding the compatibility relationships at the junction of raft and superstructure. In the second method, statically admissible contact pressure distributions beneath the raft are successively modified to converge upon the situation where the deformations at the junction of raft and structure are compatible. Both methods are designed for hand calculations.

Structure and Foundation Interaction Theory

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Structure and Foundation Interaction Theory