Failure Envelope of Pipe Pile Foundation under Combined Loading

2011 ◽  
Author(s):  
Qinglai Fan ◽  
Xiangbo Meng
Keyword(s):  
Pile Foundation ◽  
Combined Loading ◽  
Failure Envelope ◽  
Pipe Pile

Numerical Study of the Combined Loading Envelope of a Skirted Spudcan Foundation

2014 ◽  
Author(s):  
Ning Cheng ◽  
Mark J. Cassidy ◽  
Yinghui Tian
Keyword(s):  
Clay Soil ◽  
Numerical Study ◽  
Failure Mechanisms ◽  
Small Strain ◽  
Offshore Structures ◽  
Combined Loading ◽  
Finite Element Analyses ◽  
Failure Envelope ◽  
Foundation Type ◽  
Jack Up

Foundations for offshore structures, such as mobile jack-up units, are subjected to large horizontal (H) and moment (M) loads in addition to changing vertical (V) loads. The use of a combined vertical, horizontal and moment (V-H-M) loading envelope to define foundation capacities has become increasingly applied in recent years. However, there is no study on the skirted spudcan, a new alternative foundation type to the conventional spudcan footing for jack-ups. In this study, the combined V-H-M yield envelope of a skirted spudcan foundation in clay soil is investigated with small strain finite element analyses using 3D modeling. The footing’s uniaxial bearing capacities and failure mechanisms are described. The failure envelope for the combined V-H-M loadings is presented. A comparison of the bearing capacities between the spudcan and skirted spudcan of various dimensions is also presented.

scholarly journals Development of a new steel pipe pile foundation constructed by soil-cement mixture method.

1992 ◽  
pp. 137-146
Author(s):  
Hiroaki NAGAOKA ◽  
Harumitsu TAMANO ◽  
Hirohiko TADA ◽  
Shouhei CHIDA
Keyword(s):  
Pile Foundation ◽  
Steel Pipe ◽  
Pipe Pile ◽  
Soil Cement ◽  
Cement Mixture ◽  
Steel Pipe Pile

scholarly journals Failure Envelopes of Composite Bucket Foundation for Offshore Wind Turbines under Combined Loading with considering Different Scour Depths

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yuanxu Jing ◽  
Yuan Wang ◽  
Jingqi Huang ◽  
Wei Wang ◽  
Lunbo Luo
Keyword(s):  
Wind Turbines ◽  
Bending Moment ◽  
Offshore Wind ◽  
Combined Loading ◽  
Failure Envelope ◽  
Bucket Foundation ◽  
Offshore Wind Turbines ◽  
Failure Envelopes ◽  
The Stability ◽  
The Right

The composite bucket foundation of offshore wind turbines is subjected to a variety of loads in the marine environment, such as horizontal load H, vertical load V , bending moment M, and torque T. In addition, due to the characteristics of its connection section, the water flow around the foundation will produce scour pits of various degrees, reducing the depth of the bucket foundation, which has a nonnegligible impact on the overall stability of the bucket foundation. In this paper, the failure envelope characteristics of different combinations of loads on bucket foundations, including V -H-T, V -M-T, conventional V -H-M, and noncoplanar V -H-M, are numerically investigated with considering different scour depths. The numerical results indicate that the V -H-T, V -M-T, conventional V -H-M, and noncongruent V -H-M failure envelopes gradually shrink inwards with increasing scour depth, and the stability of the composite bucket foundation decreases; the conventional V -H-M failure envelope shows an asymmetry of convexity to the right, and the noncongruent V -H-M failure envelope shows an asymmetry of outward convexity to the left and right. The corresponding mathematical expressions for the failure envelope are obtained through the normalized fitting process, which can be used to evaluate the stability of the bucket foundation based on the relative relationship between the failure envelope and the actual load conditions, which can provide practical guidance for engineering design.

scholarly journals Mechanism of Localized Corrosion of Steel Pipe Pile Foundation for Offshore Wind Turbines and Corrosive Action

2016 ◽  
Vol 10 (1) ◽  
pp. 685-694
Author(s):  
Kui Wang ◽  
Zhanqiang Li ◽  
Mingjie Zhao
Keyword(s):  
Wind Turbine ◽  
Ultimate Strength ◽  
Pile Foundation ◽  
Local Corrosion ◽  
Steel Pipe ◽  
Corrosion Mechanism ◽  
General Corrosion ◽  
Splash Zone ◽  
Pipe Pile ◽  
Steel Pipe Pile

The wind turbine foundation serves as a permanent construction in the harsh marine corrosive environment, its anti-corrosion design is essential to the safe use of the wind turbine structure. At present, there is a significant controversy over the local corrosion mechanism (such as pitting corrosion, and crevice corrosion) and its diffusion mechanism in the academic circle. In the paper, the Faraday electrochemistry formula was used to compute the local corrosion degree of the steel pipe pile for the wind turbine and obtain the general corrosion equivalent. The local corrosion effect of the offshore steel pipe pile for the wind turbine was converted into homogeneous corrosion thickness loss of certain length, and then the ultimate strength of the offshore steel pipe pile foundation for the wind turbine was analyzed under the conditions of local corrosion. The result indicates that the maximum ultimate strength reductionof the steel pipe pile for the wind turbine induced by the local corrosion in the splash zone is 80.8% of the non-corrosive ultimate strength. The maximum ultimate strength reduction of the steel pipe pile for the wind turbine induced by the local corrosion in the continuous immersion zone is 63% of the non-corrosive ultimate strength. Once the local corrosion rate in the splash zone exceeds 10%, the ultimate strength of the steel pipe pile for the wind turbine will exhibit a negative exponential decrease. The local corrosion in the continuous immersion zone has a huge effect on its ultimate strength. There are no significant signs of the structural strength loss. The areas prone to local corrosion should be prioritized in anti-corrosion design of the steel pipe pile for the wind turbine.

scholarly journals Characteristics and Construction Technology Analysis of Static Pressure Prestressed Pipe Piles in Construction Engineering

2018 ◽  
Vol 2 (3) ◽  
Author(s):  
Cuipeng Wu
Keyword(s):  
Pile Foundation ◽  
High Efficiency ◽  
Static Pressure ◽  
Rapid Development ◽  
Low Noise ◽  
Building Construction ◽  
Construction Technology ◽  
Construction Work ◽  
Construction Engineering ◽  
Pipe Pile

The development of urbanization has led to an increase in the number and scale of construction projects and the types of building construction engineering are getting advance and diverse due to the rapid development of technology. One of them is the static pressure prestressed pipe pile which is the most common used technology in modern building construction work.  It is mainly used for pile foundation in construction work and it has the advantages in less pollution, low noise and high efficiency compared to the traditional pile foundation. Study on the characteristics of static pressure prestressed pipe pile must be carried out and strengthened the research in order to increase the effectiveness and quality of static pressure prestressed pipe pile on construction works. This paper is mainly to analyzed the characteristic and construction technology of static pressure prestressed pipe piles on building construction work.

A New Method to Investigate the Failure Envelopes of Offshore Foundations

2016 ◽  
Author(s):  
Yinghui Tian ◽  
Tianyuan Zheng ◽  
Tao Zhou ◽  
Mark J. Cassidy
Keyword(s):  
Test Method ◽  
New Method ◽  
Combined Loading ◽  
Resistance Force ◽  
Flow Conditions ◽  
Load Path ◽  
Failure Envelope ◽  
Load Paths ◽  
Failure Envelopes ◽  
Probe Test

This paper presents an alternative numerical method in addition to the traditional ‘probe test’ to investigate the combined loading failure envelopes of foundations in soil. In the ‘probe test’ method, the foundation is displaced with a specified displacement path and eventually the soil resistance force reaches a stabilised point sitting on the failure envelope in the load space. While the displacement paths are arbitrarily or empirically set, the positions of the stabilised loads on the failure envelope can not be predetermined or planned. This paper’s new method, however, can specify the load paths, which directly shoot onto the failure envelope. This allows the investigation of the failure envelope can be better achieved with planned load paths. In addition, this new method is advantageous in checking the plastic flow conditions (i.e. normality of the failure envelope) as the load path directions are predetermined.

Effect of Slab Quality on the Microstructure and Performance of Q345C Hot Rolling Strip Used for Pipe Pile Foundation

2012 ◽  
Vol 204-208 ◽  
pp. 1210-1214
Author(s):  
Hai He Luo ◽  
De Hui Zou ◽  
Zhi Fen Wang ◽  
Han Xiong Dong ◽  
Zhong Bo Dong
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Hot Rolling ◽  
Pile Foundation ◽  
Grain Structure ◽  
Pipe Pile ◽  
Corrosion Reaction ◽  
Rolling Strip ◽  
And Performance ◽  
Microstructure And Performance

The Effect of slab quality on the microstructure and performance of Q345C hot rolling strip for pipe pile foundation were studied by SEM, EBSD, mechanical test and corrosion test. The results showed that the dendrite size of the slab had a great impact on the grain size of the steel. The fine grain structure can significantly improve the mechanical properties of the steel, but to some extent, reduce its corrosion resistance. In the early and later stage of the corrosion reaction, the coarse grain structure can improve the corrosion resistance. However, in the middle stage of the corrosion reaction, the grain size had no significant effect on the corrosion resistance. The rust layer included the inner layer and the outer layer, in which the inner layer was relatively compact, and they were mainly composed of the oxide of iron.

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