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.

Efficient modal analysis for structures with soil‐structure interaction

Abstract: An efficient methodology is presented which uses modal analysis implemented in the frequency domain to obtain the structural response of a system with soil-structure interaction. The interaction effects are represented using a free-field ground motion modification factor, derived for each mode of vibration and used in the determination of structural response. Applying this algorithm, the advantages of the modal superposition method are fully exploited, and the interaction problem can be solved easily and effectively within the framework of the conventional frequency domain analysis for a fixed-base structure. In addition, this method produces accurate approximation with less computational effort due to consideration of only the first few vibration modes of the structure.

Liquefaction hazards and their effects on buried pipelines. technical report

Abstract: The research described in this work involves the evaluation of liquefaction-induced ground movements and their effects on buried pipelines. The work is divided into three components: 1) review of liquefaction phenomena and associated ground displacements, 2) characterization of liquefaction-induced lateral spreading through observations and measurements of lateral spread deformations during past earthquakes, and 3) parametric study to evaluate buried pipeline response as a function of soil properties and geometric characteristics of lateral spreads. Case studies of four earthquakes were reviewed in which occurrences of lateral spreading have been reported. These include the 1906 San Francisco, 1964 Alaska, 1971 San Fernando, and 1983 Nihonkai-Chubu earthquakes. From these case studies, the geologic and morphologic features which control the displacement patterns of lateral spreads are identified. The damage caused by lateral spreading to lifeline system, and pipeline networks in particular, are examined. A detailed investigation was performed of ground movements associated with the 1906 San Francisco earthquake. The direction and magnitude of soil deformations are plotted on the city street system, using as references both historical accounts and photographs of damaged parts of the city after the earthquake. The pattern of soil movements are related to former topographical features of the region, the location and nature of filled areas, and the location of breaks in the pipeline system. Displacement patterns typical of those observed during the 1906 San Francisco earthquake were used as a basis for a parametric study of buried pipeline response to lateral spreading. The soil/pipeline interaction was analyzed by means of a special computer code, UNIPIP, which is capable of evaluating the elasto-plastic behavior of both the soil and the pipeline material well into the post-yield range. The strains and deformation of a 610-mm-diameter continuous steel pipeline were evaluated as a function of the maximum displacement of a lateral spread, the width over which the maximum displacement develops, and the shear strength and density of the surrounding soil.

Cost assessment of isolation technique applied to a benchmark bridge with soil structure interaction

Abstract: Bridges are lifeline structures acting as an important link in surface transportation network and their collapse under seismic excitations affects social and civil functionality. Historical bridge seismic collapses under earthquake actions have proved the significant role of soil structure interaction. The paper aims at evaluating bridge protection and seismic strengthening applying isolation technique. It is based on the application of a Performance-Based Earthquake Engineering methodology, introduced by the Pacific Earthquake Engineering Research Center. The study presents a representative two—span bridge with several isolated configurations as affected by soil deformability. Isolation technique contribution is assessed in terms of costs quantities with peak ground acceleration levels. The study can be considered a first attempt to evaluate seismic effects of SSI by taking into account economic performance.

Advanced computation methods for soil-structure interaction analysis of structures resting on soft soils

Abstract: Adopting the most accurate and realistic modelling technique and computation method for treatment of dynamic soil–structure interaction (SSI) effects in seismic analysis and design of structures re...