scholarly journals SEISMIC SOIL-STRUCTURE INTERACTION OF CROSS SECTIONS OF FLEXIBLE UNDERGROUND STRUCTURES SUBJECTED TO SOIL LIQUEFACTION

2003 ◽  
Vol 43 (2) ◽  
pp. 69-87 ◽  
Author(s):  
YUKIO TAMARI ◽  
IKUO TOWHATA
Keyword(s):  
Cross Sections ◽  
Soil Structure ◽  
Soil Liquefaction ◽  
Soil Structure Interaction ◽  
Underground Structures ◽  
Structure Interaction

Finite Element Modeling of Buried Pipelines Subjected to Seismic Loads: Soil Structure Interaction Using Contact Elements

2006 ◽  
Author(s):  
Nikos K. Kokavessis ◽  
George S. Anagnostidis
Keyword(s):  
Finite Element ◽  
Contact Surface ◽  
Soil Structure ◽  
Soil Surface ◽  
Soil Liquefaction ◽  
Traffic Load ◽  
Soil Structure Interaction ◽  
Seismic Loads ◽  
Buried Pipelines ◽  
Structure Interaction

Buried pipelines pass under lands exposed to traffic, railroads and highways, and cross through seismically active lands. The pipelines are exposed to the combined loads of soil weight, traffic load and seismic loads, and internal pressure. Several design practices exist for the combination of stresses due to soil, seismic and traffic loads, such as ASME design guide, VDTUV 1063, and DIN 2413. However, the soil structure interaction is not considered especially in the case of seismic loads. When the pipeline loses its support due to soil liquefaction then the problem can only be solved using the finite element method. Customarily, spring elements have been used to model the pipeline-soil interaction under the combined action of action of seismic, soil and pressure loads. This meshing technique, however, is tedious and time consuming. Furthermore it requires the analyst to kill spring elements that are not active. Verification of the model is thus difficult and prone to errors. In this work frictional elements are used to model the pipeline-soil interaction. This meshing technique is automatic and it does not require keeping track of the contact surfaces. The soil surface is the contact surface and the pipeline outside diameter is the target. The pipeline can be modelled as either a contact surface or a contact line depending on the dimensionality of the model.

About Contemporary Seismic Analysis of Underground Structures

2018 ◽  
Vol 931 ◽  
pp. 91-99
Author(s):  
Alexander M. Belostotskiy ◽  
Pavel A. Akimov ◽  
Dmitry S. Dmitriev
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soil Structure ◽  
Seismic Analysis ◽  
Underground Structure ◽  
Soil Structure Interaction ◽  
Underground Structures ◽  
Structure Interaction ◽  
Second Stage ◽  
Element Method

This paper is devoted to actual problems of seismic analysis of underground structures. Brief classification and overview of corresponding methods of analysis (force-based methods, displacement-based methods, numerical methods of seismic analysis of coupled system “soil – underground structure” and approaches to problems of soil-structure interaction) is presented. Special static finite element method with substructure technique for seismic analysis of underground structures is described. Dynamic soil-structure interaction system can be decomposed into three sub-structures: structure, near-field and far-field soil. The first stage of static finite element method is solving the free field shear stress, acceleration, velocity and displacement, when the moment that the relative displacement of the soil that the underground structure located in reaches the maximum. The second stage is computing of internal forces and parameters of boundary conditions. The third stage is construction of the static finite element model and imposing the loads and constrains computed at the second stage and then making a static analysis.

Sign in / Sign up

Export Citation Format

Share Document