Static and Dynamic Models for CAPWAP Signal Matching

Rausche, Frank; Likins, Garland; Liang, Liqun; Hussein, Mohamad H.

doi:10.1061/41093(372)27

Cited by 29 publications

(10 citation statements)

References 6 publications

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“…The authors view that effectiveness and efficiency cannot be maintained simultaneously for such difficult problems. The concept of the present proposal is also general in that it can be applied to different types of problems, and the authors have also applied the present method to pile driving back analysis (similar to the CAPWAP procedure as discussed by Rausche et al 2010) with satisfaction. The present formulation is not limited to any special problem so that any general function can be used with satisfaction.…”

Section: Discussionmentioning

confidence: 99%

A coupled particle swarm and harmony search optimization algorithm for difficult geotechnical problems

Cheng

Sun

et al. 2011

Struct Multidisc Optim

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Many solutions in geotechnical problems are the result of optimization analysis. There are many practical engineering problems where the objective function is nonconvex, discontinuous with the presence of multiple strong local minima, and the classical optimization methods may sometime be trapped by the local minimum during the analysis. In this paper, a coupled optimization method is proposed for such difficult cases. The mixed optimization algorithm can takes the advantage of different algorithms, and the proposed algorithm is demonstrated to be effective and efficient in solving a very complicated hydropower problem with a high level of confidence. The proposed method can further be applied to different kinds of difficult engineering problems.

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Section: Discussionmentioning

confidence: 99%

A coupled particle swarm and harmony search optimization algorithm for difficult geotechnical problems

Cheng

Sun

et al. 2011

Struct Multidisc Optim

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“…2. A wave is reflected when the incident wave meets the location of the impedance change, which may be produced by a reduction in the pile cross‐sectional area, change in the concrete qualities, or changes in soil resistance forces 10–12 …”

Section: Surface Reflection Methodsmentioning

confidence: 99%

Integrity Evaluation of PCC Piles Using the Surface Reflection Method

Yan

2012

Experimental Techniques

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The surface reflection method was used in this study to evaluate its applicability and limitations in the evaluation of the integrity of pour concrete‐cased (PCC) piles. Parametric studies of the surface reflection technique were carried out numerically and experimentally, and the responses were analyzed both in the time and frequency domains. It was found that the length of the PCC piles can be determined with confidence in both domains. However, detecting the integrity of PCC piles in the time domain seems more appropriate than that in the frequency domain. Also, the relative angle between the impact and receivers should not be larger than 90° to obtain satisfactory accuracy in the determination of the defect depth.

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“…It is also possible to use the analysis to do the reverse: estimate the static resistance from the force and velocity measured during a hammer blow. This approach to static resistance calculation is referred to as signal matching (Rausche et al, 1985(Rausche et al, , 2000(Rausche et al, , 2010Likins et al, 2012;Ng & Sritharan, 2013) and may be viewed as a more refined tool for doing what the Case method (Rausche et al, 1985) was intended to do: estimate static resistance from force and velocity measured during a hammer blow. Signals may, in theory, be matched by more than one distribution of static resistance along the pile (in other words, signal matching, as many inverse methods, is subject to the potential limitation of non-uniqueness).…”

Section: Signal Matchingmentioning

confidence: 99%

The role of soil stiffness non-linearity in 1D pile driving simulations

Salgado¹,

Loukidis²,

Abou-Jaoude³

et al. 2015

Géotechnique

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Drivability studies and determination of pile static capacity from driving resistance are an integral part of present foundation engineering practice. The success of both pile driving simulations and backcalculation of static resistance from pile driving resistance (signal matching analyses) depends on the model used for the interaction of the shaft and base of the pile with the soil. In this paper, a set of advanced base and shaft dynamic reaction models is formulated that accounts explicitly for soil stiffness non-linearity. Comparisons between predictions of the proposed soil reaction models and of various existing reaction models used in practice with measured pile driving data from two wellinstrumented field cases allow assessment both of the importance of stiffness non-linearity in accurate pile driving simulations and of the usefulness of various levels of sophistication in the shaft and base reaction models.

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Static and Dynamic Models for CAPWAP Signal Matching

Cited by 29 publications

References 6 publications

A coupled particle swarm and harmony search optimization algorithm for difficult geotechnical problems

A coupled particle swarm and harmony search optimization algorithm for difficult geotechnical problems

Integrity Evaluation of PCC Piles Using the Surface Reflection Method

The role of soil stiffness non-linearity in 1D pile driving simulations

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