Numerical investigation on bearing capacity of OWT foundation with large diameter monopile under Seismic load

2021 ◽  
Vol 108 ◽  
pp. 102518
Author(s):  
Qiyi Zhang ◽  
Yuan Zhang ◽  
Haodi Lin ◽  
Liang Feng
Keyword(s):  
Bearing Capacity ◽  
Numerical Investigation ◽  
Large Diameter ◽  
Seismic Load

Numerical investigation of the monotonic drained lateral behaviour of large diameter rigid piles in medium dense uniform sand

Géotechnique ◽  
2021 ◽  
pp. 1-39
Author(s):  
Huan Wang ◽  
M. Fraser Bransby ◽  
Barry M. Lehane ◽  
Lizhong Wang ◽  
Yi Hong
Keyword(s):  
Numerical Investigation ◽  
Load Transfer ◽  
Large Diameter ◽  
Offshore Wind ◽  
Soil Pressure ◽  
Lateral Capacity ◽  
Pile Diameter ◽  
Centrifuge Tests ◽  
Lateral Response ◽  
Loading Eccentricity

This paper presents a numerical investigation of the monotonic lateral response of large diameter monopiles in drained sand with configurations typical of those employed to support offshore wind turbines. Results from new centrifuge tests using instrumented monopiles in uniform dry sand deposits are first presented and used to illustrate the suitability of an advanced hypoplastic constitutive model to represent the sand in finite element analyses of the experiments. These analyses are then extended to examine the influence of pile diameter and loading eccentricity on the lateral response of rigid monopiles. The results show no dependency of suitably normalized lateral load transfer curves on the pile diameter and loading eccentricity. It is also shown that, in a given uniform sand, the profile with depth of net soil pressure at ultimate lateral capacity is independent of the pile diameter because of the insensitivity of the depth to the rotation centre for a rigid pile. A normalization method is subsequently proposed which unifies the load-deflection responses of different diameter rigid piles at a given load eccentricity.

Experiment on the Hysteretic Behaviors of Light-Weight Steel Portal Frame with Tapered Members

2011 ◽  
Vol 368-373 ◽  
pp. 206-210
Author(s):  
Qi Cai Li ◽  
Zhen Shan Wang ◽  
Ming Zhou Su ◽  
Xue Chao Shao ◽  
Lin Shen
Keyword(s):  
Energy Consumption ◽  
Bearing Capacity ◽  
Stiffness Degradation ◽  
Seismic Load ◽  
Seismic Action ◽  
Light Weight ◽  
Loading Test ◽  
Skeleton Curve ◽  
Portal Frame ◽  
Tapered Members

In order to study the seismic behavior of steel portal frame structures, Cyclic loading test on a 1:3-scaled model of single-story single-bay steel portal frame with tapered members has been carried out. Based on test results, hysteretic curve, skeleton curve, stiffness degradation and transverse displacement of the structure are obtained. Meanwhile, the seismic performances of the structure are analyzed from aspects of ductility, energy consumption, stiffness degradation, bearing capacity, etc. It is concluded that ductility and energy consumption capacity of this structure are poor; because of its light weight, the structure attracts little seismic load; when portal frame structure designed according to current Chinese design codes suffers from small seismic action, it has enough seismic bearing capacity.

Construction Method and Numerical Analysis on the Bearing Capacity of the Large Diameter and Abyssal Pile Located in Complex Karst Area

2013 ◽  
Vol 639-640 ◽  
pp. 688-693
Author(s):  
Jin Yi ◽  
Guo Jing He ◽  
Si Si Liu ◽  
Zhi Yong Li ◽  
Zu En Zheng
Keyword(s):  
Bearing Capacity ◽  
Load Transfer ◽  
Large Diameter ◽  
Construction Method ◽  
Karst Area ◽  
Karst Region ◽  
Pile Capacity ◽  
Construction Methods ◽  
Geological Conditions ◽  
Transfer Method

This paper introduced construction method for deep pile of Zishui bridge through karst region and the checking results of the pile bearing capacity. Firstly, main structure of Zishui bridge was simply introduced. Secondly, according to the special geological conditions, construction methods for bored piles in water and drilling platform were described. The discussion focused on the problem of boring and grouting in karst foundation and their solutions. Finally, to ensure that the pile capacity can meet the design requirements, load transfer method was used on the part of pile foundation to calculate the bearing capacity. Results showed that pile bearing capacity meet the requirements, and the feasibility and correctness of construction method of Zishui bridge was also verified,which provides references for the design and construction of the same civil engineering.

Testing Study on Bearing Behavior of Belled Large-Diameter PHC Pipe Pile by NAKS (Nakabori Kakutei System) Construction Method

2013 ◽  
Vol 353-356 ◽  
pp. 533-539 ◽  
Author(s):  
Wen Xu ◽  
Yu Bin Hou
Keyword(s):  
Bearing Capacity ◽  
Large Diameter ◽  
Field Testing ◽  
Construction Method ◽  
Load Test ◽  
Test Field ◽  
Static Load Test ◽  
Pipe Pile ◽  
Bored Pile ◽  
Bearing Behavior

Through field static load test and pile shaft axial force test, field testing study is conducted on bearing behavior of NAKS-construction-method belled large-diameter PHC pipe pile; besides, the test result is compared with that of hammering-method PHC pipe pile and bored pile with same pile length and diameter under the same site condition. The result shows that the ultimate bearing capacity of NAKS-construction-method belled large-diameter PHC pipe pile is slightly inferior to hammering-method PHC pipe pile but obviously superior to that of bored pile. Compared with traditional hammering-method pipe pile, the pile side resistance of NAKS-construction-method belled pipe pile is smaller; however, the higher toe resistance will give better play to bearing capacity of bearing stratum of pile toe; moreover, it is found that under the action of ultimate load and failure load, the maximum settlement and final settlement of NAKS-construction-method belled pipe pile tip are obviously lower than that of other test piles, which is conductive to lessening foundation settlement of upper structure.

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