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.

Study on the Bearing Mechanism of Bucket Foundation for Offshore-Wind Turbine in Soft Clay

2011 ◽  
Vol 71-78 ◽  
pp. 1795-1804
Author(s):  
Jian Feng Wang ◽  
Hai Tao Dai ◽  
Ming Qin
Keyword(s):  
Large Scale ◽  
Soft Clay ◽  
Bending Moment ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Horizontal Load ◽  
Vertical Load ◽  
Bucket Foundation ◽  
Finite Element Software ◽  
Moment Load

Based on numerical platform of large-scale finite element software, this paper investigates the function mechanisms of vertical load, horizontal load, and bending moment load of soft-clay-base bucket foundation. Then the corresponding load bearing characteristics of each load type of soft-clay-base bucket foundation are determined.

Model Test Study on the Effect of Horizontal Load on the Vertical Bearing Capacity of Disk Pile

2011 ◽  
Vol 368-373 ◽  
pp. 2571-2574
Author(s):  
Cheng Yuan Lu ◽  
Jin Jin Li ◽  
Fan Li Meng
Keyword(s):  
Bearing Capacity ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Initial Time ◽  
Horizontal Load ◽  
Vertical Load ◽  
Soil Pressure ◽  
Test Study ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

A group of model tests were designed to study the effect of horizontal load on the vertical bearing capacity of disk pile. Three double-disk piles were used in the test, and the distance of the two disks is 5 times as the disk diameter. Drew a horizontal load H=100N/200N/300N on the top of pile1/2/3 respectively, and put on the vertical load stage by stage, then studied the differences of three piles’ bearing properties such as changes of the pile bending moment, the horizontal and vertical deformation on the top, and soil pressure around the pile. Experiment showed that when the horizontal load is quite small, the existence of horizontal load has little to do with vertical bearing capacity. When the load reached a certain level, the p-∆ effect under the vertical load will significantly affect the vertical bearing capacity of the pile. Especially during the initial time while there is a large horizontal displacement or rotation generated by the horizontal load, the pile’s bearing capacity is controlled by the horizontal displacement.

Combination of Multiple Extreme Bending Moment Components

2012 ◽  
Author(s):  
Bernt J. Leira
Keyword(s):  
Bending Moment ◽  
Geometric Approach ◽  
Bending Moments ◽  
Load Effect ◽  
Zero Crossing ◽  
Combined Load ◽  
Component Processes ◽  
Velocity Variances ◽  
Moment Load ◽  
Wave Induced

A procedure for estimating the combined load effect for processes with different zero-crossing periods is described. The procedure is illustrated by application to the combination of wave-induced bending moments. The basic formulations related to the distribution of maxima and extremes for a scalar Gaussian process are first reviewed. Subsequently, an outline of the procedure for multi-component processes is given. The developed formulation is then applied for analysis of the combined bending moment load effect. Two cases of such combinations are addressed (i) A case with widely different velocity variances (ii) A case involving a non-linear combination of the bending moments. A geometric approach to the interpretation and derivation of associated load effect combination factors is also demonstrated.

scholarly journals EXPERIMENTAL AND ANALYTICAL COMPARISON OF TORSION, BENDING MOMENT AND SHEAR FORCES IN REINFORCED CONCRETE BEAMS USING BS 8110, EURO CODE 2 AND ACI 318 PROVISIONS

2017 ◽  
Vol 36 (3) ◽  
pp. 705-711
Author(s):  
CP Amulu ◽  
CA Ezeagu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Testing Machine ◽  
Bending Moment ◽  
Reinforced Concrete Beams ◽  
Bending Moments ◽  
Shear Forces ◽  
Combined Loads ◽  
Angle Crack ◽  
Set Up

This study investigated the effect of combined actions of torsional moments, bending moments and shear forces in reinforced concrete beams with concrete compressive strength of 30N/mm2.The ultimate torsional moments, bending moments, and shear forces of the beams were determined experimentally, through a simple test arrangement set-up on fifteen beam specimens grouped from BC1 to BC5, three beam specimens in each group. The combined loads were induced by loading the test beams at an eccentricity of  from the beam’s principal axis at the mid-span, using Computerized Universal Testing Machine TUE-C-100. BS 8110, Euro code 2 and ACI 318 were used to calculate the ultimate torsional moments provided by both longitudinal and transverse reinforcements, bending moments and shear forces induced. The values obtained from the codes were compared with those of experimental results for validation. It was observed that Eurocode 2 predicted the highest bending moment of 21.1530kNm, the highest torsional moments of 9.8470kNm and 12.6193kNm, for torsional resistance provided by longitudinal and transverse reinforcements respectively, at an angle crack of 45°, while BS 8110 predicted the least values. ACI 318 predicted the highest value of internal shear forces that the beams possessed before yielding to the applied loads. http://dx.doi.org/10.4314/njt.v36i3.7

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.

Model Test Study on the Effect of Vertical Lode on Horizontal Bearing Capacity of Disk Pile

2012 ◽  
Vol 446-449 ◽  
pp. 1804-1807
Author(s):  
Fan Li Meng ◽  
Guang Yu Sun ◽  
Cheng Yuan Lu
Keyword(s):  
Bearing Capacity ◽  
Model Test ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Combined Loading ◽  
Horizontal Load ◽  
Vertical Deformation ◽  
Vertical Load ◽  
Disk Diameter ◽  
Test Study

In order to study how it influence the horizontal bearing capacity of the disk pile when there exists a vertical load, a group of model tests has been designed. Three double-disk piles were used in the test, and the distance of the two disks is 5 times as the disk diameter. First drew a vertical load V=200N/300N/400N on the top of pile1/2/3 respectively, then put on the horizontal load stage by stage. And by the test, we can study the differences of the pile bearing properties such as changes in the pile bending moment, the horizontal and vertical deformation on the top. Experiment showed that when the vertical load is quite small（V=200N、300N）, the existence of vertical load has little to do with horizontal bearing capacity. When a vertical load increases to a certain value（V=400N）, The maximum bending moment and horizontal displacement of the pile under the same horizontal load reduce, which indicates that the disks of the pile play a significant role in bearing combined loading.

scholarly journals Behavior Characteristics of Single Batter Pile under Vertical Load

2021 ◽  
Vol 11 (10) ◽  
pp. 4432
Author(s):  
Jiseong Kim ◽  
Seong-Kyu Yun ◽  
Minsu Kang ◽  
Gichun Kang
Keyword(s):  
Bearing Capacity ◽  
Relative Density ◽  
Model Test ◽  
Ground Surface ◽  
Bending Moment ◽  
Vertical Position ◽  
Vertical Load ◽  
Behavior Characteristics

The purpose of this study is to grasp the behavior characteristics of a single batter pile under vertical load by performing a model test. The changes in the resistance of the pile, the bending moment, etc. by the slope of the pile and the relative density of the ground were analyzed. According to the results of the test, when the relative density of the ground was medium and high, the bearing capacity kept increasing when the angle of the pile moved from a vertical position to 20°, and then decreased gradually after 20°. The bending moment of the pile increased as the relative density of the ground and the batter angle of the pile increased. The position of the maximum bending moment came closer to the ground surface as the batter angle of the pile further increased, and it occurred at a point of 5.2~6.7 times the diameter of the pile from the ground surface.

Cyclic behavior of wood-frame shear walls with vertical load and bending moment for mid-rise timber buildings

2021 ◽  
Vol 240 ◽  
pp. 112298
Author(s):  
Paúl Orellana ◽  
Hernán Santa María ◽  
José Luis Almazán ◽  
Xavier Estrella
Keyword(s):  
Bending Moment ◽  
Shear Walls ◽  
Cyclic Behavior ◽  
Vertical Load ◽  
Wood Frame

Effect of Torsion on Collapse Bending Moment for 24-Inch Diameter Schedule 80 Pipes With Wall Thinning

2012 ◽  
Author(s):  
Kunio Hasegawa ◽  
Yinsheng Li ◽  
Bostjan Bezensek ◽  
Phuong Hoang
Keyword(s):  
Power Plants ◽  
Bending Moment ◽  
Combined Loading ◽  
Bending Moments ◽  
Compressive Stresses ◽  
Wall Thinning ◽  
Nominal Thickness ◽  
Calculation Results ◽  
Loading Modes ◽  
Local Wall Thinning

Piping items in power plants may experience combined bending and torsion moments during operation. Currently, there is a lack of guidance in the ASME B&PV Code Section XI for combined loading modes including pressure, torsion and bending. Finite element analyses were conducted for 24-inch diameter Schedule 80 pipes with local wall thinning subjected to tensile and compressive stresses. Plastic collapse bending moments were calculated under constant torsion moments. From the calculation results, it can be seen that collapse bending moment for pipes with local thinning subjected to tensile stress is smaller than that subjected to compressive stress. In addition, equivalent moment is defined as the root the sum of the squares of the torsion and bending moments. It is found that the equivalent moments can be approximated with the pure bending moments, when the wall thinning length is equal or less than 7.73R·t for the wall thinning depth of 75% of the nominal thickness, where R is the mean radius and t is the wall thickness of the pipe.

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