Seismic analysis of pile foundation in soft soils subjected to earthquake loading

2003 ◽  
Vol 87 (6) ◽  
pp. 73-79
Author(s):  
Kwang-han Lee ◽  
Si-seong Jeong ◽  
Hee-joong Son
Keyword(s):  
Pile Foundation ◽  
Seismic Analysis ◽  
Earthquake Loading ◽  
Soft Soils

scholarly journals Nonlinear Seismic Behavior of Different Boundary Conditions of Transmission Line Systems under Earthquake Loading

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Li Tian ◽  
Xia Gai
Keyword(s):  
Boundary Conditions ◽  
Transmission Line ◽  
Transmission Lines ◽  
Seismic Analysis ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Earthquake Loading ◽  
Transmission Tower ◽  
Line System ◽  
Different Boundary Conditions

Nonlinear seismic behaviors of different boundary conditions of transmission line system under earthquake loading are investigated in this paper. The transmission lines are modeled by cable element accounting for the nonlinearity of the cable. For the suspension type, three towers and two span lines with spring model (Model 1) and three towers and four span lines’ model (Model 2) are established, respectively. For the tension type, three towers and two span lines’ model (Model 3) and three towers and four span lines’ model (Model 4) are created, respectively. The frequencies of the transmission towers and transmission lines of the suspension type and tension type are calculated, respectively. The responses of the suspension type and tension type are investigated using nonlinear time history analysis method, respectively. The results show that the responses of the transmission tower and transmission line of the two models of the suspension type are slightly different. However, the responses of transmission tower and transmission line of the two models of the tension type are significantly different. Therefore, in order to obtain accurate results, a reasonable model should be considered. The results could provide a reference for the seismic analysis of the transmission tower-line system.

scholarly journals Seismic bridge pier analysis for pile foundation by force and displacement based approaches

2015 ◽  
Vol 13 (2) ◽  
pp. 155-166
Author(s):  
NP.R. Singh ◽  
Hemant Vinayak
Keyword(s):  
Pile Foundation ◽  
Seismic Analysis ◽  
Slenderness Ratio ◽  
Soft Soil ◽  
Time History ◽  
Bridge Pier ◽  
Base Shear ◽  
Displacement Based ◽  
Shear Demand ◽  
Analytical Approaches

Seismic analysis of bridge pier supported on pile foundation requires consideration of soil-pile-structure (kinematic and inertial) interactions. This paper presents the design forces generated for bridge piers with varying height and constant diameter for medium and soft soils in earthquake probability zones considering contribution of soil-pile-structure interactions by developed analytical approaches. The results have shown that the difference in base shear demand between force based and displacement based approach and that between capacity spectrum and displacement based method in general decreases with the increase in slenderness ratio of the pier. The base shear demand by non-linear time history analysis has been found to be much higher compared to that by other methods. The relationship between height and pier cross-section has been developed for different soils and seismic zones such that the base shear demands by force based and displacement based method are of the same order. The overall value of the slenderness ratio works out to be such that failure of the pile shall be as a short column for both medium and soft soil.

scholarly journals Axial Bearing Capacity Analysis of Pile Foundation using Nakazawa Method

Jurnal IPTEK ◽  
2020 ◽  
Vol 24 (1) ◽  
pp. 45-52
Author(s):  
Laras Laila Lestari ◽  
Jaka Propika ◽  
Aisyah Dwi Puspasari
Keyword(s):  
Bearing Capacity ◽  
Soil Type ◽  
Pile Foundation ◽  
Capacity Analysis ◽  
Calculation Methods ◽  
Soft Soils ◽  
N Value ◽  
Axial Forces ◽  
Friction Bearing ◽  
Friction Interaction

Pile foundation serves to distribute all the loads in the building to the ground. There are several calculation methods for bearing capacity of pile foundation, one of them is Nakazawa method. Nakazawa method adapted from calculation used in Japan where it is relevant for soft soils. The aim of this research is to obtain axial bearing capacity of pile foundation that can withstand axial forces using Nakazawa method. The parameter that used for the calculation is modified or average N-value (). The analysis result shows the  value is smaller than N existing, indicate that Nakazawa tend to use weaker value of N blows. It means the calculation is considered softer type of soils than the existing ones.The value of point bearing capacity, Rp, assimilate to the pattern of N-SPT. The result value of friction bearing, Rf, in respect of depth shows the linear trending. Rf along the pile depends on the friction interaction between soil and structure. This phenomena influenced by the soil type. The value of cohession along the pile augment, means the ability of soils to stick to the pile/structure is also high. It explains why the value of friction bearing is bigger in respect of depth.

Pushover Analysis of Pile-Supported Bridge Piers

2013 ◽  
Vol 681 ◽  
pp. 234-239
Author(s):  
Chang Feng Wang ◽  
Yi Jun Bao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Pile Foundation ◽  
Seismic Analysis ◽  
Pushover Analysis ◽  
Element Model ◽  
Vertical Force ◽  
Skeleton Curve ◽  
Seismic Design Code ◽  
Rare Earthquake

According to Japan Railway seismic design code, truss finite element model is established considering the pile components and foundation nonlinear finite element model in this paper, an analysis on the ultimate horizontal bearing capacity of bridge pile foundation of passenger dedicated line is made and the results of m-method calculation are compared. The analysis results show that: when horizontal force at the top of pier is larger, with the pile side soil horizontal and vertical force continuously into the plastic, the calculation results differ greatly with two seismic specification; the pier top level force-displacement skeleton curve considered pile-soil interaction is available in trilinear description, the analysis results can provide a theoretical basis for the seismic analysis of the pile foundation under rare earthquake.

Seismic analysis of the pile foundation of the reactor building of the NPP Angra 2

1981 ◽  
Vol 65 (3) ◽  
pp. 329-341 ◽  
Author(s):  
J.P. Wolf ◽  
G.A. von Arx ◽  
F.C.P. de Barros ◽  
M. Kakubo
Keyword(s):  
Pile Foundation ◽  
Seismic Analysis ◽  
Reactor Building

scholarly journals Seismic Analysis of Deep Water Pile Foundation Based on Three-Dimensional Potential-Based Fluid Elements

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Kai Wei ◽  
Wancheng Yuan
Keyword(s):  
Experimental Data ◽  
Deep Water ◽  
Pile Foundation ◽  
Seismic Analysis ◽  
Three Dimensional ◽  
Time History ◽  
Water Systems ◽  
Interface Elements ◽  
Complex Effect ◽  
Structure Interaction

This paper investigates the use of three-dimensional (3D) ϕ-u potential-based fluid elements for seismic analyses of deep water pile foundation. The mathematical derivations of the potential-based formulations are presented for reference. The potential-based modeling technique is studied and validated through experimental data and analytical solutions. Earthquake time history analyses for a 9-pile foundation in dry and different water environments are conducted, respectively. The seismic responses are discussed to investigate the complex effect of earthquake-induced fluid-structure interaction. Through the analyses, the potential-based fluid and interface elements are shown to perform adequately for the seismic analyses of pile foundation-water systems, and some interesting conclusions and recommendations are drawn.

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