Nonlinear interaction behaviour of plane frame-layered soil system subjected to seismic loading

2012 ◽  
Vol 41 (6) ◽  
pp. 711-734 ◽  
Author(s):  
Ramakant Agrawal ◽  
M.S. Hora
Keyword(s):  
Nonlinear Interaction ◽  
Seismic Loading ◽  
Layered Soil ◽  
Soil System ◽  
Plane Frame

State-of-the-Art Techniques for Seismic Soil-Structure Interaction Analysis of Steel Gravity Structures

2014 ◽  
Author(s):  
Frederick Tajirian ◽  
Mansour Tabatabaie ◽  
Basilio Sumodobila ◽  
Stephen Paulson ◽  
Bill Davies
Keyword(s):  
Soil Structure ◽  
State Of The Art ◽  
Interaction Analysis ◽  
Layered Soil ◽  
Soil Structure Interaction ◽  
Soil System ◽  
Cyclonic Storm ◽  
Structure Interaction ◽  
Analysis Methods ◽  
Moderate Seismicity

The design of steel jacket fixed offshore structures in zones of moderate seismicity is typically governed by Metocean loads. In contrast the steel gravity structure (SGS) presented in this paper, is a heavy and stiff structure. The large mass results in foundation forces from seismic events that may exceed those created by extreme cyclonic storm events. When computing the earthquake response of such structures it is essential to account for soil-structure interaction (SSI) effects. Seismic SSI analysis of the SGS platform was performed using state-of-the-art SSI software, which analyzed a detailed three-dimensional model of the SGS supported on layered soil system. The results of this analysis were then compared with those using industry standard impedance methods whereby the layered soil is replaced by equivalent foundation springs (K) and damping (C). Differences in calculated results resulting from the different ways by which K and C are implemented in different software are presented. The base shear, overturning moment, critical member forces and maximum accelerations were compared for each of the analysis methods. SSI resulted in significant reduction in seismic demands. While it was possible to get reasonable alignment using the different standard industry analysis methods, this was only possible after calibrating the KC foundation model with software that rigorously implements SSI effects. Lessons learned and recommendations for the various methods of analysis are summarized in the paper.

Nonlinear Analysis of Interaction of Superstructure-Pile-Raft-Soil System in Layered Soil — Part II: Characteristics of Reaction Force on Pile Head and Displacement of Raft

2008 ◽  
Vol 400-402 ◽  
pp. 659-666
Author(s):  
Jun Chen ◽  
Yong Hong Chang ◽  
Yin Sheng Zou
Keyword(s):  
Nonlinear Analysis ◽  
Quantitative Data ◽  
Reaction Force ◽  
The State ◽  
Layered Soil ◽  
Analysis Method ◽  
Pile Head ◽  
Soil System ◽  
Piled Raft ◽  
Piled Raft Foundation

Using the nonlinear analysis method and program of the interaction of superstructure- pile-raft-soil system in layered soil in the state of the previous literature, the reaction force on the pile head and the displacement characteristics of raft of the piled-raft foundation are analysed when the thickness of the raft, the spacing of the piles, the length and the diameter of the pile are changed. Some quantitative data and qualitative conclusions are obtained in this paper.

Research on Horizontal Displacement and Torsion Coupling Effect of Structure-Soil System

2013 ◽  
Vol 275-277 ◽  
pp. 1107-1110
Author(s):  
Nan Jiang ◽  
Hui Fang Zhao
Keyword(s):  
Energy Transfer ◽  
Nonlinear Interaction ◽  
Coupling Effect ◽  
Kinematic Hardening ◽  
Horizontal Displacement ◽  
Torsional Stiffness ◽  
Soil System ◽  
Vibration Equation ◽  
Interaction System ◽  
Effect Of Structure

In this paper, the vibration equation of the structure-soil nonlinear interaction system was qualitatively analyzed by using the modern dynamic theory. Based on the multilinear kinematic hardening mode, the nonlinear finite element method was applied for the solution of the horizontal and torsional stiffness between the foundation and soil interaction system. And a mechanical model of the structure-soil nonlinear interaction system was established. The Lagrange energy method is used to build the coupling vibration equation of the structural horizontal displacement and torsion. The Primary resonance of the structure-soil nonlinear interaction system was studied by using the multiple scales method. By analyzing the nonlinear coupling interaction between different structures and soil, the coupling effect of structure system was revealed by appearing energy transfer from high order horizontal vibration to low order torsional vibration, and also the vibration characteristics and the behavior of energy transfer were obtained.

Laterally Loaded Piles in a Layered Soil System

1963 ◽  
Vol 89 (3) ◽  
pp. 63-94 ◽  
Author(s):  
M. T. Davisson ◽  
H. L. Gill
Keyword(s):  
Layered Soil ◽  
Laterally Loaded Piles ◽  
Soil System ◽  
Laterally Loaded

Investigation of Simplified Integrated Model for Soil-Pile Dynamic Interaction System

2008 ◽  
Vol 33-37 ◽  
pp. 1149-1154
Author(s):  
Q.W. Zhang ◽  
Di Tao Niu ◽  
T. Zhang ◽  
B.Y. Zhang
Keyword(s):  
Stiffness Matrix ◽  
Seismic Loading ◽  
Pile Group ◽  
Integrated Model ◽  
Dynamic Interaction ◽  
Simplified Model ◽  
Surface Model ◽  
Working Mechanism ◽  
Soil System ◽  
Interaction System

A simplified integrating model is developed for soil-pile dynamic interaction system under seismic loading. Different from previous work, this simplified model constructs the whole system stiffness matrix by combining the stiffness matrix of pile and near region soil system according to the volumetric ratio of pile group and soil system. This simplified model can avoid deviation brought by previous soil-pile surface model and can felicitously simulate the co-working mechanism between soil and piles. The feasibility of the proposed approach is assessed by comparing with in-site observation result of real project.

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