Showing papers on "Soil structure interaction published in 1973"

Dynamic structure-soil-structure interaction

Abstract: A study is made of the dynamic interaction, through the soil, between two parallel infinite shear walls placed on rigid foundations. The steady-state response of both structures for a vertically incident SH wave is obtained and compared with the corresponding values resulting from consideration of only one structure. It is found that the additional interaction effects caused by the presence of a second structure are especially important at low frequencies and in the neighborhood of the fixed-base natural frequencies of the second structure. For high frequencies it is sufficient to consider the interaction between each structure and the soil, ignoring the presence of other structures.

Nonlinear Discrete Element Analysis of Frames

Abstract: A discrete element model of plane frame members is presented that can represent the nonlinear behavior of plane frame members. Nonlinear stress-strain curves, nonlinear soil support characteristics, and the nonlinearities associated with the change in geometry of the structure under load are handled simultaneously in the discrete element model. The tangent stiffness method is used in developing an iterative solution for the displacements of the frame joints. The solution has been programmed and is capable of solving a wide variety of practical problems such as large plane frame supported on piles driven into a highly nonlinear soil and subjected to complex loading conditions that cause large displacements, nonlinear stress-strain response, and nonlinear soil structure interaction.

Investigation of soil-structure interaction of buried concrete pipe

Abstract: A long-range research project has been undertaken to investigation the nature of the loading imposed on a concrete pipe when it is buried at a significant depth below the surface of the ground. The project consists of (a) a series of field installations and (b) development of a comprehensive finite-element program. The initial field tests consisted of a trench installation and an embankment installation. Pipe sections were instrumented with strain gauges, fittings for taking diameter and chord measurements, and surface pressure meters. Stress cells were installed in the soil at various locations in the vicinity of the pipe. Data will be used to verify the accuracy of the computer simulation. The plane strain computer model will permit the use of nonlinear mechanical properties for both concrete and soil materials. A cracking mechanism has been developed that accurately modesl the behavior of concrete pipe at the initiation of, and following the development of, cracking in the concrete. The validity of the finite-element model of the pipe has been established on the basis of the results of a program of laboratory tests on sections of a full-size concrete pipe under controlled loading conditions. The proven computer model of the soil-structure system will help to make it possible to identify the relative significance of various parameters of the interaction system.

Response of Structures to Combined Blast Effects

Abstract: This paper describes methods of computing dynamic structural response, including interaction between the structure and surrounding soil. Two applications of the finite element method to the dynamic response of a small structure embedded in sand are described. One application involves a three dimensional analysis in which the soil is represented by continuum elements and the structure by plate elements. The second application involves an axisymmetric approximation of the structure, in which the effects of nonlinearity of the soil and slip between soil and structure are accounted for. Comparison is made between the analyses and measurements made during the physical experiment which was conducted at U.S. Army Waterways Experiment Station, Vicksburg, Miss. The main goal of the paper is to assess the capabilities and limitations of existing finite element methods to predict response under these conditions. Satisfactory agreement in the frequency domain between about 40 to 200 cps was obtained. A correlation at higher frequencies was not attempted.