A study on low strain integrity testing of platform-pile system using staggered grid finite difference method

Jiang, Jin He; Liu, Dong Jia; Lu, Zhi Tang; Tao, Jun Lin; Liu, Huaxuan

doi:10.1016/j.soildyn.2014.10.009

Cited by 7 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e velocity components are located on the physical surface of the computational model, the shear stress terms are also on the surface so that they can be set to zero, and guided elastic waves in structures are analyzed at MHz frequencies [24]; thus, these free surface treatments limit the SFD modeling and generalization ability. e SFD method has been used for the analysis of platform-pile systems without considering the free surface of 3D structures [26,30,31]. e computational domain is a regular cuboid domain.…”

Section: Discretization Schemesmentioning

confidence: 99%

“…Stress imaging was suggested for P-SV wave propagation using a finite-difference scheme and free surface boundary conditions [25]. e staggered-grid finite-difference (SFD) method was used to model a platform-pile system, considering zero stress on the free surface and absorbing boundary conditions [26]. Zero-stress formulation was used to deal with a planar free surface problem in SFD simulation [27].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study on Integrity Testing for Platform-Pile Systems considering Wave Propagation

Lin

2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Platform-pile systems are typically used in bridge foundations and seaport structures. These systems are difficult to analyze using a conventional low-strain integrity test (LST) due to periodic oscillations. A staggered-grid finite-difference (SFD) method is proposed for a platform-pile system in soil and verified with ABAQUS and measured data. Different impact locations on the top surface of the platform and the lateral surface of the pile are analyzed, and parallel velocities are obtained at different locations. Choosing an appropriate impact location reduces the influence of the periodic oscillation signal; the impact locations at the center of symmetry are the best choices. At the same impact energy, the impact location should not be outside the cross section of the pile when the impact occurs on the top surface of the platform to achieve a meaningful damage signal. When the impact locations are on the lateral surface of the pile, the interferences are relatively small, and the damage vibration signal can be detected. The material and size of the hammer determine the impact duration and should be chosen to reduce the high-frequency influences and obtain reasonable data for analysis.

show abstract

Section: Discretization Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study on Integrity Testing for Platform-Pile Systems considering Wave Propagation

Lin

2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Consolidation wave velocity was used to test the anchorage quality for an anchorage system [18]. For piles, the PIT (Pile Integritiy Test) low strain instrument was used to test pile integrity [19], and the characteristics of stress wave propagation in pile were studied [20,21].…”

Section: Article No 21 the Civil Engineering Journal 4-2016 --------mentioning

confidence: 99%

Comparison of Propagation Characteristics of Excited Stress Waves in Pile and Anchorage With Bolt Systems

Zeng

Zhang

Sun

2016

CEJ

View full text Add to dashboard Cite

Dynamic testing methods for pile systems and anchorage-with-bolt systems are similar and often confused with each other, possibly resulting in incorrect assessment of the quality of the pile and the anchorage systems. The stress wave velocity is one of the most important parameters for evaluating the quality of dynamic tests. In this paper, the stress wave velocities in standard concrete specimens of the free rock bolt and the different ages were a reference for comparing the stress wave velocities in a pile-and-anchor system. The tests were conducted using the low strain reflected wave method. Results indicate that the wave velocity in a pile is larger than that in the standard samples, and that the wave velocity in an anchorage-with-bolt system is smaller than that in a free steel bar, but larger than that in a pile and in standard samples. Wave velocities in the pile and in the standard samples were found to raise as the ages of samples increased. The wave velocity in the anchorage-with-bolt system initially decreased as specimen age increased, but increased with increasing specimen age afterward. KEYWORDSLow strain reflected wave method, stress wave velocity, pile, anchorage with bolt systém

show abstract

“…The finite difference method (FDM) was first used in the numerical simulation of pile dynamic responses. Due to the lack of ability to adapt to the boundary, the FEM has become the numerical simulation method today [1,2]. As a result of increasing complexity and difficulty, the simulation developed from being one-dimensional to three-dimensional.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of low strain dynamic testing of pile with inhomogeneous elastic modulus

Xu¹,

Shen²,

Ren³

2017

J. meas. eng.

View full text Add to dashboard Cite

Abstract. Low strain dynamic testing is an important nondestructive testing method in the engineering. However, the pile foundation material is usually assumed as having a uniform elastic modulus in low strain simulations. In this paper, we consider the elastic modulus of concrete as having an inhomogeneous elastic modulus that is described by the Weibull distribution model. An explicit algorithm was adopted in order to solve the model. The finite element method (FEM) was used to simulate the low strain dynamic test of a 3D pile. The response velocity characteristics of different shape parameters were obtained using this method, and the Daubechies wavelet transform was used to analyze the characteristics of the wavelet modulus. The result shows that simulation response velocity has a correlation with the different homogeneity of the elastic modulus.

show abstract

A study on low strain integrity testing of platform-pile system using staggered grid finite difference method

Cited by 7 publications

References 12 publications

A Study on Integrity Testing for Platform-Pile Systems considering Wave Propagation

A Study on Integrity Testing for Platform-Pile Systems considering Wave Propagation

Comparison of Propagation Characteristics of Excited Stress Waves in Pile and Anchorage With Bolt Systems

Simulation analysis of low strain dynamic testing of pile with inhomogeneous elastic modulus

Contact Info

Product

Resources

About