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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

邮发代号 80-968

2019 Impact Factor: 1.68

Frontiers of Structural and Civil Engineering  2018, Vol. 12 Issue (4): 594-608   https://doi.org/10.1007/s11709-017-0446-2
  本期目录
ANN-based empirical modelling of pile behaviour under static compressive loading
Abdussamad ISMAIL()
Department of Civil Engineering, Bayero University, Kano, Nigeria
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Abstract

Artificial neural networks have been widely used over the past two decades to successfully develop empirical models for a variety of geotechnical problems. In this paper, an empirical model based on the product-unit neural network (PUNN) is developed to predict the load-deformation behaviour of piles based SPT values of the supporting soil. Other parameters used as inputs include particle grading, pile geometry, method of installation as well as the elastic modulus of the pile material. The model is trained using full-scale pile loading tests data retrieved from FHWA deep foundations database. From the results obtained, it is observed that the proposed model gives a better simulation of pile load-deformation curves compared to the Fleming’s hyperbolic model and t-z approach.

Key wordspiles in compression    load-deformation behaviour    product-unit neural network
收稿日期: 2017-04-10      出版日期: 2018-11-20
Corresponding Author(s): Abdussamad ISMAIL   
 引用本文:   
. [J]. Frontiers of Structural and Civil Engineering, 2018, 12(4): 594-608.
Abdussamad ISMAIL. ANN-based empirical modelling of pile behaviour under static compressive loading. Front. Struct. Civ. Eng., 2018, 12(4): 594-608.
 链接本文:  
https://academic.hep.com.cn/fsce/CN/10.1007/s11709-017-0446-2
https://academic.hep.com.cn/fsce/CN/Y2018/V12/I4/594
Fig.1  
Type of pile material Driven Bored
dry excavation wet excavation
Concrete piles 38 49 5
H-Steel piles 14 - -
Pipe piles 9 - -
Tab.1  
Length (m) Perimeter (m) Base area (m2) Elastic modulus (GPa)
Concrete Steel
Set Training Testing Training Testing Training Testing Training Testing Training Testing
x ¯ 11.785 15.782 1.5627 1.3405 0.37230 0.26920 28.93 28.93 200 200
xmin 30.480 31.590 3.8023 2.3939 2.63885 0.51890 28.975 28.975 200 200
xmax 3.650 6.240 0.3990 0.6384 0.00033 0.00032 28.9 28.9 200 200
Tab.2  
Training
algorithm
No. of
nodes
R-RMSE
(training)
Id
(training)
R-RMSE
(testing)
Id
(testing)
BP 2 0.34338 0.85678 0.35488 0.83603
3 0.29353 0.86996 0.36032 0.80784
PSO 2 0.34134 0.84912 0.37485 0.78259
3 0.35212 0.84419 0.38264 0.81474
BP-PSO (I) 2 0.45053 0.80113 0.46770 0.74878
3 0.28873 0.87660 0.24173 0.86268
BP-PSO (II) 2 0.16947 0.90233 0.22429 0.89563
3 0.36282 0.85703 0.38482 0.80109
Tab.3  
Parameter Training method
BP PSO BP-PSO (I) BP-PSO (II)
Duration (s) 223 279 236 211
No. of evaluations 350 720 430 310
Tab.4  
Parameter Concrete pile Steel pile
Driven Bored (dry) Bored (wet) H-steel Pipe
C1* -1.2617 -1.5265 -3.158 -0.4825 -1.2477
C2* 7.4131 4.0196 9.417 1.2000 9.8365
C3* -1156.7931 -2773.5869 -1743.864 -497.4374 -778.0912
C4* 12.5277 1.8631 0.086 58.9117 9.7524
C5* 843.1412 2280.6517 1520.356 520.3886 586.0043
C6* -0.0544 -0.0035 -0.006 -0.1629 -0.1430
Tab.5  
Piles in silt Piles in clay
C1= C1* ( fm+1 ) α1| ( f P+1) 1.1674 C1= C1* ( fc+1 ) β1| ( f P+1) 1.1674
C2= C2* ( fm+1 ) α2| ( f P+1) 1.0706 C2= C2* ( fc+1 ) β2| ( f P+1) 1.0706
C3= C3* ( fm+1 ) α3| ( f P+1) 0.1185 C3= C3* ( fc+1 ) β3| ( f P+1) 0.1185
C4= C4* ( fm+1 ) α4| ( f P+1) 1.8514 C4= C4* ( fc+1 ) β4| ( f P+1) 1.8514
C5= C5* ( fm+1 ) α5| ( f P+1) 0.1248 C5= C5* ( fc+1 ) β5| ( f P+1) 0.1248
C6= C6* ( fm+1 ) α6| ( f P+1) 1.4099 C6= C6* ( fc+1 ) β6| ( f P+1) 1.4099
Tab.6  
Parameter Pile type Parameter Pile type
Driven Bored Driven Bored
α1 1.2116 0.0954 β1 -0.0544 -0.2202
α2 -3.5895 0.9541 β2 -6.4958 0.4383
α3 -0.9161 0.1716 β3 -0.6348 -0.1101
α4 3.7225 3.7366 β4 2.0345 2.2703
α5 -0.1026 2.0021 β5 0.1708 0.0957
α6 1.0802 2.3988 β6 0.6985 6.8073
Tab.7  
Fig.2  
Fig.3  
Fig.4  
Fig.5  
Fig.6  
Fig.7  
Fig.8  
Fig.9  
Fig.10  
Fig.11  
Fig.12  
Fig.13  
Fig.14  
Fig.15  
Fig.16  
Fig.17  
Fig.18  
Fig.19  
Fig.20  
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