Design models for steel encased high-strength precast concrete piles under axial-flexural loads

Thusoo, Shreya; Obara, Taku; Kôno, Susumu; Miyahara, Kiyoshi

doi:10.1016/j.engstruct.2020.111465

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…These problems generally lead to brittle failure in PHC piles under severe horizontal load or seismic load (Uzuoka et al 2007;Wang et al 2019). For this reason, in the medium and high intensity seismic areas, PHC piles are not commonly used for the pile heads, but rather in the lower pile sections (Thusoo et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Pretensioned Centrifugal Spun Concrete Piles with Combined Steel Strands and Deformed Steel Bars

Ren,

Xu,

Chen

et al. 2023

J. Struct. Eng.

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Pretensioned spun high-strength concrete piles usually use the traditional helical grooved steel bars as the main reinforcement, which leads to insufficient ductility. Replacing prestressing steel bars with steel strands can effectively overcome the problem. To further enhance the overall seismic performance of the piles, pretensioned centrifugal spun concrete piles with a combined use of pretensioned steel strands and nonprestressing deformed steel bars (PSRC piles) have been developed. This paper presents the experimental and numerical investigations into the seismic performances of PSRC piles. Three full-scale PSRC pile specimens have been tested under lateral cyclic loading with different axial compressive forces, and the results are analyzed in detail and discussed. The influence of incorporating the deformed steel bars on the cyclic behavior of piles is examined with comparison to the previous test results of the counterpart piles with only steel strands.A detailed finite element model of the PSRC pile specimens is developed and verified against the test results.2 Parametric analyses are then carried out using the validated model. The results show that the incorporation of non-prestressing deformed steel bars markedly improves the cracking behavior of the piles with much diffused crack distributions. The combined use of steel strands and deformed bars also results in better deformation capacity as well as higher load bearing capacity. By adjusting the concrete wall thickness and selecting a desirable ratio of prestressing steel strands and non-prestressing deformed bars, sufficient deformation and load bearing capacities can be ensured with the piles.

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Section: Introductionmentioning

confidence: 99%

Seismic Performance of Pretensioned Centrifugal Spun Concrete Piles with Combined Steel Strands and Deformed Steel Bars

Ren,

Xu,

Chen

et al. 2023

J. Struct. Eng.

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show abstract

“…The collapse of a 13-story high-rise residential building in June 2009 was partly attributable to the low flexural capacity of PHC piles [3]. In fact, the application of PHC piles in seismic regions is generally restricted, for example in China PHC piles can only be used in low seismic intensity regions and for multi-story buildings and in Japan PHC piles are restricted to middle and bottom of the whole pile length, with steel encased piles at the top [4]. Some new types of piles have been developed and studied in recent years, such as steel pipe piles and composite piles, which exhibit good structural performance.…”

Section: Introductionmentioning

confidence: 99%

Flexural performance of pretensioned centrifugal spun concrete piles with combined steel strands and reinforcing bars

Ren

Chen

et al. 2021

Structures

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“…Moreover, the conventional ductility based on yield strain may lose its importance, because a large strain can be generated even when there is no yield. It is also known that ductile fracture behaviour with a sufficiently large strain without failure under nominal flexural strength is possible even when there is no yield [23]. The strain ratio for nominal-strength behaviour versus working-load behaviour thus becomes a more important design factor than ductility.…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of Reinforced Concrete Members with Steel Bars

Lim

Lee

2021

Applied Sciences

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The use of high-tension bars to strengthen flexural members is gaining increasing interest. However, the applicability of current standards to such bars is uncertain, because there may not be a definite yield strength and it may be unclear whether the tensile or compressive failure mode dominates. Determining the balanced–destruction steel ratio is particularly difficult. We measure the bending behaviour of flexural members containing high-tension bars with different yield strengths and tensile steel ratios. We conclude that the maximum-steel-ratio regulation and nominal -strength equation in the current standard remain applicable.

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Design models for steel encased high-strength precast concrete piles under axial-flexural loads

Cited by 8 publications

References 19 publications

Seismic Performance of Pretensioned Centrifugal Spun Concrete Piles with Combined Steel Strands and Deformed Steel Bars

Seismic Performance of Pretensioned Centrifugal Spun Concrete Piles with Combined Steel Strands and Deformed Steel Bars

Flexural performance of pretensioned centrifugal spun concrete piles with combined steel strands and reinforcing bars

Flexural Performance of Reinforced Concrete Members with Steel Bars

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