Numerical Algorithm for Dynamic Impedance of Bridge Pile-Group Foundation and Its Validation
Abstract
:1. Introduction
2. Project-Oriented Numerical Algorithm for Impedance of Pile-Group Foundation
2.1. Definition of the Impedance Functions
2.2. Refined FE Model of the Cap–Pile Group–Surrounding Soil System
2.3. Boundary Conditions
2.4. Calculation of the Impedance Funcitons
3. Verification of the Numerical Algorithm
3.1. Comparison with Existing Methods
3.2. Field Experiment
3.2.1. Description of the Experiment
- (1)
- Impact the top of the cap in a vertical direction and obtain its vertical acceleration response;
- (2)
- Impact the north side of the cap and obtain its acceleration response in a north–south direction;
- (3)
- Impact the east side of the cap and obtain its acceleration response in an east–west direction.
3.2.2. Experimental Results
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Item | Parameter | Value |
---|---|---|
Piles | Pile diameter | 1.0 m |
Pile length | 20 m | |
Pile spacing | 5.0 m | |
Unit weight | 20 kN/m3 | |
Poisson’s ratio | 0.25 | |
Elasticity modulus | 3.92 × 109 N/m2 | |
Soil | Unit weight | 14 kN/m3 |
Dam** ratio | 0.05 | |
Velocity of shear wave | 100 m/s | |
Poisson’s ratio | 0.4 |
Item | Unit Weight (kN/m3) | Poisson’s Ratio | Elasticity Modulus (N/m2) |
---|---|---|---|
Soil type 1 | 20 | 0.25 | 7.08 × 107 |
Soil type 2 | 20 | 0.35 | 4.37 × 107 |
Soil type 3 | 20 | 0.25 | 10.8 × 107 |
Soil type 4 | 18.5 | 0.35 | 12.3 × 107 |
Pile | 25 | 0.25 | 3.25 × 1010 |
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Wang, C.; Qiao, H.; Wang, Y.; Du, X. Numerical Algorithm for Dynamic Impedance of Bridge Pile-Group Foundation and Its Validation. Algorithms 2021, 14, 247. https://doi.org/10.3390/a14080247
Wang C, Qiao H, Wang Y, Du X. Numerical Algorithm for Dynamic Impedance of Bridge Pile-Group Foundation and Its Validation. Algorithms. 2021; 14(8):247. https://doi.org/10.3390/a14080247
Chicago/Turabian StyleWang, Chenyu, Hong Qiao, Yi Wang, and **anting Du. 2021. "Numerical Algorithm for Dynamic Impedance of Bridge Pile-Group Foundation and Its Validation" Algorithms 14, no. 8: 247. https://doi.org/10.3390/a14080247