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

Xu, Juncai; Shen, Zhenzhong; Ren, Qingwen

doi:10.21595/jme.2017.18905

Cited by 3 publications

(3 citation statements)

References 6 publications

(2 reference statements)

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“…In [9] the analysis of wave propagation in the pile integrity test was considered, while in [19] the pile integrity was analyzed using the wavelet theory. Numerical analysis of defective piles was considered in studies [28] and [8], and numerical analysis of pile integrity with variable modulus of elasticity in operation was considered in [26]. Analyses of 3D effects in pile integrity tests were presented in [30] and [29].…”

Section: Ispitivanje Integriteta šIpova Testom Integriteta šIpa Sa Sementioning

confidence: 99%

“…U radu [9], razmatrana je analiza propagacije talasa prilikom testa integriteta šipa, dok se u radu [19], primenom teorije talasića, analizira integritet šipa. Numerička analiza defektnih šipova razmatrana je u istraživanjima [28] i [8], a numerička analiza integriteta šipa s promenljivim modulom elastičnosti u radu [26]. Analize 3D efekata, prilikom testa integriteta šipa, prikazane su u radovima [30] i [29].…”

Section: Introductionunclassified

See 1 more Smart Citation

Pile integrity testing: Testing and results analysis

Ćosić¹,

Božić-Tomić²,

Nenad³

2019

Građ materijali i konstrukcije

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Problematika ispitivanja integriteta šipova u poslednjih dvadesetak godina doživela je ekspanziju u pogledu: metodologije ispitivanja, tehnike i instrumentalizacije ispitivanja, raznovrsnosti tipova testova ispitivanja, softversko-hardverske podrške ispitivanju i teorije i obrade signala. U tom smislu, biti građevinski inženjer ili inženjer geotehnike sa iskustvom u oblasti projektovanja i izgradnje fundamenata nije dovoljan uslov, već se zahteva multidisciplinarnost u razmatranju problematike ispitivanja šipova. Pored standardnih naučnih disciplina, kao što su teorija elastičnosti, mehanika tla, dinamika tla, mehanika stena, fundiranje, ispitivanje konstrukcija, zahteva se i dobro poznavanje relativno novije naučne tematike interakcija konstrukcija-tlo, ali i drugih naučnih tematika (koje se primarno ne izučavaju u građevinarstvu ili u geotehnici), kao što su: talasna teorija, metoda karakteristika, teorija i obrada signala, termodinamička teorija i slično. U zavisnosti od stepena poznavanja određenih naučnih disciplina, zavisi i stepen pouzdanosti primenjene metodologije i interpretacije rezultata ispitivanja. Iskustva autora ovog rada pokazuju da se neretko nailazi na neadekvatnu interpretaciju standarda ispitivanja šipova, pa i kompletne metodologije ispitivanja. U tom smislu, težišta ovog rada jesu da se predstave određena iskustva autora rada i da se ukaže na potrebu za doslednošću u primeni metodologije ispitivanja šipova, koja je prikazana u radu [6]. S druge strane, primena nekoliko metoda u ispitivanju integriteta šipova omogućava bolje sagledavanje finalnog rešenja ispitivanja. Sve ove metode, primarno, zasnivaju se na talasnoj teoriji, ali i na procesiranju signala i na numeričkim analizama.

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Section: Ispitivanje Integriteta šIpova Testom Integriteta šIpa Sa Sementioning

confidence: 99%

Section: Introductionunclassified

Pile integrity testing: Testing and results analysis

Ćosić¹,

Božić-Tomić²,

Nenad³

2019

Građ materijali i konstrukcije

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show abstract

“…The lateral dimensions of the surrounding rock have an impact on the test results [9,25]. In such cases, the stress waves propagating in the anchorage system are similar to pile foundations, and under the influence of size effects, the peak of the bottom reflection signal is reduced, making it difficult to identify response peak at the defect [26,27].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Sun,

Zhu,

Song

et al. 2024

Meas. Sci. Technol.

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When the surrounding rock of tunnel anchor bars has boundaries, the signals obtained from NDT of anchor rods will be simultaneously affected by size effects and pull-out loads, leading to potential misinterpretation of the test results. In order to accurately assess the anchorage quality of anchor rods under this interference, NDT and numerical simulations of anchor rods subjected to different anchorage quality were conducted under the influence of size effects and pull-out loads. A signal filtering method, which combines the infinite impulse response-finite difference method , was proposed for identify the impact of size effects. The study analyzed the variations in wave velocity and fundamental frequency of anchor rods with anchorage defects and intact anchor rods under the influence of size effects and pull-out loads. The results indicate that the IIR-FDM method, in comparison to the traditional wavelet method, provides better agreement between the calculated wave velocities and existing findings. With the increase of size effect, the wave velocity and amplitude ratio of the anchor rods decrease, and the fundamental frequency increases first and then decreases. As the working load on the anchor rods increases, the wave velocity initially decreases, then rises, while the fundamental frequency initially increases and then experiences a slight decrease. The presence of anchorage defect results in an increase in the wave velocity and amplitude ratio of the anchor rods, while causing a decrease in the fundamental frequency. This effect of defects on wave velocity and fundamental frequency is more pronounced at lower loads. The wave velocity after IIR-FDM processing has a small error with the simulated wave velocity, indicating the reliability of the processing method.

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Grey Model Based Traffic Analysis on Car-hailing Platforms

Chen

Kou

2019

Proceedings of the 2019 International Conference on Artificial Intelligence and Computer Science

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

Cited by 3 publications

References 6 publications

Pile integrity testing: Testing and results analysis

Pile integrity testing: Testing and results analysis

Investigation on the dynamic characteristics of anchor rods considering size effect and pull-out loads based on IIR-FDM

Grey Model Based Traffic Analysis on Car-hailing Platforms

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