Analysis of Dynamic Stiffness of Bridge Cap‐Pile System

Jun-Hao, Chu; Ma, Meng; Wang, Zhibin

doi:10.1155/2018/7645726

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Ma et al [13] also measured the dynamic stiffness for 680 bridge piles and found that an obvious positive correlation exits between the dynamic stiffness and bearing capacity of intact piles. To consider the influence of pile cap in the method, Chu et al [20] performed a laboratory test and a numerical model to investigate the dynamic stiffness of the cappile system. In addition, the dynamic stiffness index was also employed to detect the void behind the tunnel linings [21].…”

Section: Introductionmentioning

confidence: 99%

A Full‐Scale Experimental Study of the Vertical Dynamic and Static Behavior of the Pier‐Cap‐Pile System

Liu

Stochino³

2020

Advances in Civil Engineering

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The bearing capacity evaluation of bridge substructures is difficult as the static loading test (SLT) cannot be employed for the bridges in services. As a type of dynamic nondestructive test technique, the dynamic transient response method (TRM) could be employed to estimate the vertical bearing capacity when the relationship between static stiffness and dynamic stiffness is known. The TRM is usually employed to evaluate single piles. For the pier-cap-pile system, its applicability should be investigated. In the present study, a novel full-scale experimental study, including both TRM test and SLT, was performed on an abandoned bridge pier with grouped pile foundation. The test included three steps: firstly, testing the intact pier-cap-pile system; then, cutting off the pier and testing the cap-pile system; finally, cutting off the cap and testing the single pile. The TRM test was repeatedly performed in the above three steps, whereas the SLT was only performed on the cap-pile system. Based on the experimental results, the ratio of dynamic and static stiffness of the cap-pile system was obtained. The results show that (1) in the low-frequency range (between 10 and 30 Hz in this study), the dynamic stiffness of the whole system is approximately four times of that of a single pile; (2) the ratio of dynamic and static stiffness of the cap-pile system tested in the study is approximately 1.74, which was similar to other tested values of a single pile; (3) to evaluate the capacity of similar cap-pile system and with similar soil layer conditions by TRM, the value of Kd/Ks tested in the study can be used as a reference.

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Section: Introductionmentioning

confidence: 99%

A Full‐Scale Experimental Study of the Vertical Dynamic and Static Behavior of the Pier‐Cap‐Pile System

Liu

Stochino³

2020

Advances in Civil Engineering

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Numerical and test study on vertical vibration characteristics of pile group in slope soil topography

Ding

Zheng

et al. 2021

Earthq. Eng. Eng. Vib.

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A Model Test of the Dynamic Stiffnesses and Bearing Capacities of Different Types of Bridge Foundations

Liu

2022

Applied Sciences

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With the rapid development of traffic infrastructures in developing countries, the evaluation demands for the vertical capacities of in-service bridges are increasing. The feasibilities of the transient response method (TRM) and index of dynamic stiffness for evaluating pile foundations are proven. However, their applicability to other types of bridge foundations must be investigated, and the correlation between the dynamic and static stiffnesses is also needed for analysis. In the present study, model tests were performed in a laboratory for various types of bridge foundations. A total of eight foundation models were fabricated for three types of bridge foundations. Both TRM and static loading tests were applied on each model. The influence of the foundation constraint state was tested as well. The results show that there is an obvious correlation between the dynamic and static stiffnesses and that the index of dynamic stiffness can reflect the foundation bearing capacity. Accordingly, the TRM can be employed to evaluate different foundation types, including spread, caisson, and pile foundations.

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Analysis of Dynamic Stiffness of Bridge Cap‐Pile System

Cited by 3 publications

References 17 publications

A Full‐Scale Experimental Study of the Vertical Dynamic and Static Behavior of the Pier‐Cap‐Pile System

A Full‐Scale Experimental Study of the Vertical Dynamic and Static Behavior of the Pier‐Cap‐Pile System

Numerical and test study on vertical vibration characteristics of pile group in slope soil topography

A Model Test of the Dynamic Stiffnesses and Bearing Capacities of Different Types of Bridge Foundations

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