Numerical Analysis of the Bearing Behavior of Single Pile under Horizontal Load

2014 ◽  
Vol 580-583 ◽  
pp. 287-290
Author(s):  
De Fu Ma ◽  
Guang Jun Guo ◽  
Xia Yang ◽  
Zhi Dong Zhou
Keyword(s):  
Mechanical Characteristics ◽  
Bending Moment ◽  
Displacement Curve ◽  
Single Pile ◽  
Horizontal Load ◽  
Soil Resistance ◽  
Distribution Law ◽  
Foundation Design ◽  
Pile Shaft ◽  
Bearing Behavior

Understanding the pile behavior and predicting the capacity of piles under horizontal load are important topics in foundation design. In this paper, the mechanical characteristics of single pile under horizontal load is analyzed based on FLAC3D finite difference software, and the load-displacement curve, the bending moment, shear force, soil resistance under all levels of load and the distribution law of p-y curve along the pile shaft are obtained. accordingly the following conclusions can be made: the bending moment of the upper part of pile body is big, the maximum bending moment is at the height of 2~3 meters and it is almost zero below the depth of 9 meters. The bending moment increases with the increase of load, the point of maximum bending moment moves down along the pile body with the increasing of horizontal load. and the location of the point of maximum bending moment moves from 2 meters below the ground to 3 meters below it. The distribution of soil resistance along the pile shaft is a reverse "S", the maximum of pile lateral soil resistance is at the height of about 2~3 meters below the ground.

scholarly journals A Parametric Study of Effect On Single Pile Integrity Due to An Adjacent Excavation Induced Stress Release in Soft Clay

2018 ◽  
Vol 8 (4) ◽  
pp. 3189-3193 ◽  
Author(s):  
D. A. Mangnejo ◽  
M. A. Soomro ◽  
N. Mangi ◽  
I. A. Halepoto ◽  
I. A. Dahri
Keyword(s):  
Soft Clay ◽  
Bending Moment ◽  
Small Strain ◽  
Single Pile ◽  
Stress Release ◽  
Pile Shaft ◽  
Induced Stress ◽  
Parametric Studies ◽  
Pile Settlement ◽  
Pile Integrity

To gain new insights into single pile responses to adjacent excavations in soft ground, numerical parametric studies are carried out. An advanced hypoplastic (clay) constitutive model which takes account of small-strain stiffness is adopted. The effects of excavation depths (i.e. formation level) relative to pile were investigated by simulating the excavation near the pile shaft (i.e., He/Lp=0.67), next to (He/Lp=1.00) and below the pile toe (He/Lp=1.33). Among the three cases, the excavation in case of He/Lp=1.33 resulted in the largest pile settlement (i.e. 7.6%dp). On the other hand, the largest pile bending moment was induced in case of He/Lp=0.67.

scholarly journals Study of the Force and Deformation Characteristics of Subsea Mudmat-Pile Hybrid Foundations

2018 ◽  
Vol 25 (s3) ◽  
pp. 43-53 ◽  
Author(s):  
Desen Kong ◽  
Meixu Deng ◽  
Yi Liu ◽  
Xiaoyan Tan
Keyword(s):  
Bending Moment ◽  
Simulation Software ◽  
Horizontal Load ◽  
Deformation Characteristics ◽  
Bending Moments ◽  
Vertical Load ◽  
Pile Shaft ◽  
Combined Loads ◽  
Moment Load ◽  
Seabed Soil

Abstract To study the force and deformation characteristics of subsea mudmat-pile hybrid foundations under different combined loads, a project at a water depth of 200 m in the South China Sea was studied. A numerical model of a subsea mudmatpile hybrid foundation is developed using the numerical simulation software FLAC3D. The settlement of the seabed soil, the bending moments of the mudmat, and the displacements and bending moments along the pile shaft under different load combinations, including vertical load and horizontal load, vertical load and bending moment, and horizontal load and bending moment load, are analyzed. The results indicate that settlement of the seabed soil is reduced by the presence of piles. The settlement of the mudmat is reduced by the presence of piles. Different degrees of inclination occur along the pile shaft. The angle of inclination of pile No. 1 is greater than that of pile No. 2. The dip directions of piles No. 1 and No. 2 are identical under the vertical load and bending moment and are opposite to those under the other combined loads. The piles that are located at the junctions between the mudmat and the tops of the piles are easily destroyed.

Issues on Design of Piled Raft Foundation

2018 ◽  
Vol 14 (1) ◽  
pp. 6057-6061 ◽  
Author(s):  
Padmanaban M S ◽  
J Sreerambabu
Keyword(s):  
Contact Area ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Foundation Design ◽  
Detailed Review ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation ◽  
Influencing Parameters

A piled raft foundation consists of a thick concrete slab reinforced with steel which covers the entire contact area of the structure, in which the raft is supported by a group of piles or a number of individual piles. Bending moment on raft, differential and average settlement, pile and raft geometries are the influencing parameters of the piled raft foundation system. In this paper, a detailed review has been carried out on the issues on the raft foundation design. Also, the existing design procedure was explained.

Study and Application on Computational Methods for Ultimate Bearing Capacity of Single Pile

2008 ◽  
Vol 400-402 ◽  
pp. 329-334
Author(s):  
Ze Liang Yao ◽  
Zhen Jian ◽  
Guo Liang Bai
Keyword(s):  
Bearing Capacity ◽  
Computational Methods ◽  
Ultimate Bearing Capacity ◽  
Contact Element ◽  
Computational Formula ◽  
Single Pile ◽  
Foundation Design ◽  
Experiment Method ◽  
Contact Element Method ◽  
Element Method

It is difficult and important to accurately calculate single pile ultimate bearing capacity during pile foundation design. Typical computational methods on single pile ultimate bearing capacity are contrastively analyzed in this paper. Contact element method on single pile ultimate bearing capacity is relatively accurate and economical, but it isn’t used in practical projects until now because its computational process is complicated. 343 different single pile ultimate bearing capacities are calculated with the contact element method in order to study a simple computational formula based on the contact element method. All data calculated are analyzed with a linear recursive multi-analysis program which is programmed with Fortran90. A simple computational formula on the contact element method is presented based on the analysis results. The simple computational formula, the experiential formula in the code, the contact element method and the static load experiment method are respectively used to calculate single pile ultimate bearing capacity in two practical projects in order to test the simple computational formula. The results show that the simple computational formula is relatively accurate. Some advice is presented based on the analysis results.

scholarly journals Numerical Simulation of Dynamic Response and Evaluation of Flexural Damage of RC Columns under Horizontal Impact Load

2021 ◽  
Vol 11 (23) ◽  
pp. 11223
Author(s):  
Bin Hu ◽  
Jian Cai ◽  
Jiabin Ye
Keyword(s):  
Static Load ◽  
Impact Load ◽  
Bending Moment ◽  
Internal Force ◽  
Displacement Curve ◽  
Fe Model ◽  
Damage State ◽  
Rc Columns ◽  
Equivalent Static Load ◽  
The Impact

By using the ABAQUS finite element (FE) model, which has been verified by experiments, the deformation and internal force changes of RC columns during the impact process are investigated, and a parametric analysis is conducted under different impact kinetic energies Ek. According to the development path of the bottom bending moment-column top displacement curve under impact, the member is in a slight damage state when the curve rebounds before reaching the peak and in a moderate or severe damage state when the curve exceeds the peak, in which case the specific damage state of the member needs to be determined by examining whether there is a secondary descending stage in the curve. Accordingly, a qualitative method for evaluating the bending failure of RC column members under impact is obtained. In addition, the damage state of RC columns under impact can also be quantitatively evaluated by the ratio of the equivalent static load Feq and the ultimate static load-bearing capacity Fsu.

Study on the Design Method of Deepwater Steel Lazy Wave Riser

2019 ◽  
Author(s):  
Zhao Wang ◽  
Wei Qin ◽  
Xiaojie Zhang ◽  
Jiannan Zhao ◽  
Yong Bai
Keyword(s):  
Oil And Gas ◽  
Design Method ◽  
Bending Moment ◽  
Design Criterion ◽  
Design Flow ◽  
Distribution Law ◽  
Gas Field ◽  
Field Development ◽  
Moment Distribution ◽  
Oil And Gas Field

Abstract The steel lazy wave riser has been used in deep-water oil and gas field development because it has good adaption to the movement of the upper platform and economic efficiency. The typical design criterion and design flow of steel lazy wave riser are introduced in this paper. The design method and the equivalence principle of distributed buoyancy modules are given. The formulas of equivalent hydrodynamic parameters are derived in this paper. The influences of distributed buoyancy modules (DBM) and the buoyancy factor on the configuration of the riser, the top tension, and the bending moment distribution are discussed and summarized. The distribution law of effective stress response along the pipe can be analyzed by dynamic analysis, and it provides reference for the global design of steel lazy wave riser.

scholarly journals Influence of the phase difference between kinematic and inertial loads on seismic behaviour of pile foundations in layered soils

2020 ◽  
Author(s):  
Thejesh Kumar Garala ◽  
Gopal Madabhushi
Keyword(s):  
Natural Frequency ◽  
Free Field ◽  
Phase Relationship ◽  
Phase Variation ◽  
Bending Moment ◽  
Pile Group ◽  
Pile Foundations ◽  
Single Pile ◽  
Seismic Behaviour ◽  
Soil Layers

A series of dynamic centrifuge experiments was conducted on model pile foundations embedded in a two-layered soil profile consisted of soft-clay layer underlain by dense sand. These experiments were specifically designed to investigate the individual effect of kinematic and inertial loads on a single pile and a 3×1 row pile group during model earthquakes. It was observed that the ratio of free-field soil natural frequency to the natural frequency of structure might not govern the phase relationship between the kinematic and inertial loads for pile foundations as reported in some previous research. The phase relationship obtained in this study agrees well with the conventional phase variation between the force and displacement of a viscously damped simple oscillator subjected to a harmonic force. Further, as expected, the pile accelerations and bending moments can be smaller when the kinematic and inertial loads act against each other compared to the case when they act together on the pile foundations. This study also revealed that the peak kinematic pile bending moment will be at the interface of soil layers for both single pile and pile group. However, in the presence of both kinematic and inertial loads, the peak pile bending moment can occur either at the shallower depths or at the interface of soil layers depending on the pile cap rotational constraint.

Numerical Analysis of the Influence of Vertical Load on the Horizontal Bearing Capacity of Single Pile

2011 ◽  
Vol 374-377 ◽  
pp. 1947-1952 ◽  
Author(s):  
Zhao Yun Xiao ◽  
Guo Xun Zhang ◽  
Wei Xu ◽  
Zhong Ming Xue
Keyword(s):  
Numerical Simulation ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Sandy Soils ◽  
Single Pile ◽  
Horizontal Load ◽  
Clayey Soils ◽  
Vertical Load ◽  
Concrete Pile ◽  
Finite Element Numerical Simulation

It is a complicated progress of interaction between pile and soil when pile is under both vertical load and horizontal load. This paper analyzes the variation of stress, strain, deformation and deflection of the pile body by finite element numerical simulation of single bored concrete pile under vertical load together with horizontal load. Based on the existing research results, conclusions could be that the vertical load can increase horizontal bearing capacity of the pile in sandy soils, but horizontal bearing capacity of the pile in clayey soils is more complicated. Hope that the simulation can provide some references for the design of pile foundation.

scholarly journals A Blast-Resistant Method Based on Wave Converters with Spring Oscillator for Underground Structures

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Yu Zhang ◽  
Yuanxue Liu ◽  
Runze Wu ◽  
Jichang Zhao ◽  
Ming Hu ◽  
...  
Keyword(s):  
High Frequency ◽  
Mechanical Characteristics ◽  
Peak Pressure ◽  
Low Frequency ◽  
Bending Moment ◽  
Dynamic Responses ◽  
Shopping Malls ◽  
Underground Structures ◽  
Periodic Stress ◽  
Resistant Structure

Researches on blast-resistant measures for underground structures such as tunnels and underground shopping malls are of great importance for their significant role in economic and social development. In this paper, a new blast-resistant method based on wave converters with spring oscillator for underground structures was put forward, so as to convert the shock wave with high frequency and high peak pressure to the periodic stress wave with low frequency and low peak pressure. The conception and calculation process of this new method were introduced. The mechanical characteristics and motion evolution law of wave converters were deduced theoretically. Based on the theoretical deduction results and finite difference software FLAC3D, the dynamic responses of the new blast-resistant structure and the traditional one were both calculated. Results showed that, after the deployment of wave converters, the peak absolute values of the bending moment, shear force, and axial force of the structure decreased generally, which verified the good blast-resistant effect of the new blast-resistant method.

Structural Analysis for Bitumen Residuum Concrete Inclined Wall Rockfill Dam of Fengguo Reservoir

2013 ◽  
Vol 394 ◽  
pp. 385-389
Author(s):  
Dongy Yu Ji
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Analysis ◽  
Mechanical Characteristics ◽  
Process Analysis ◽  
Dam Construction ◽  
Construction Process ◽  
Distribution Law ◽  
Operational Process ◽  
Rockfill Dam

Through analyzing bitumen residuum concrete inclined wall rockfill dam structures mechanical characteristics in construction process and operational process, this paper adopts finite element method to carry out structural analysis for bitumen residuum concrete inclined wall rockfill dam of Fengguo reservoir. Deducing distribution law of the dams stress and displacement in construction process and operational process. Analysis results show that, bitumen residuum concrete inclined wall rockfill dam construction of Fengguo reservoir is reasonable, it meets the requirements for design.

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