Experimental Study on Bending Resistance of New Type Joint of Prestressed Concrete Pipe Pile

Wang, Bo; Liu, Qi; Yang, Yue

doi:10.3390/sym14091920

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Although there have been developments in the machine learning method [11][12][13], its application in crack identification of pipe pile engineering has not been reported yet. For improving the construction efficiency and ensuring the stability of the mechanical properties of joints, some improvement measures or new joints have been developed and applied [14][15][16][17]. Among them, the connections of end plate welding combined with welding angle steel [14], new elastic clip type [15], and screw-locked type [16] are all beneficial to improve the ultimate bending capacity of solid square piles, and the ultimate bending moments of such joint specimens are larger than that calculated theoretically.…”

Section: Introductionmentioning

confidence: 99%

Bending Strength of Connection Joints of Prestressed Reinforced Concrete Pipe Piles

Tang

Ling

Qi³

2023

Buildings

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The connection joint of prestressed concrete pipe piles is a typical steel–concrete structure, and its bending strength has evolved into a critical factor affecting the safety of supporting structures in underground engineering. Based on full-scale bending tests of five specimens of large-diameter prestressed reinforced concrete (PRC) pipe piles and connection joints, as well as the corresponding finite element numerical simulation, the bending bearing and deformation characteristics of connection joints of PRC pipe piles were analyzed, together with the effects of concrete strength, precompression stress, and connection mode of joints. The results showed that the crack resistance of the welded joint of PRC pipe piles was equivalent to that of the pipe pile shaft, but the ultimate bending moment of the joint was about 58–87% of that of the pile shaft. The bending failure mode of the pipe pile joint was mainly manifested in the end plate yielding into a drum shape, with the tension side of the pile hoop and the end plate clearly separated from the pipe pile, and crushed concrete at the upper edge of the pile hoop. The bending strength of the joint can be improved by increasing the bonding strength between the end plates of the joint or embedding Rachel reinforcement in concrete. In addition, synchronously increasing the strength grade and reinforcement ratio of concrete or strengthening the precompression stress of concrete are favorable measures.

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Section: Introductionmentioning

confidence: 99%

Bending Strength of Connection Joints of Prestressed Reinforced Concrete Pipe Piles

Tang

Ling

Qi³

2023

Buildings

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“…A pretensioned prestressed high strength concrete pipe is called a PHC pile for short [1][2][3][4]. Its bearing capacity includes vertical bearing capacity, horizontal bearing capacity and seismic bearing capacity [5][6][7][8][9][10][11][12]. A single pile static load test is currently the most reliable method for a quality inspection of pile foundation engineering, and it is also a method that can measure the relationship between pile-soil stress and strain, and the results can be used as the basis for pile foundation engineering design [13].…”

Section: Introductionmentioning

confidence: 99%

Field Test Study on the Bearing Capacity of Extra-Long PHC Pipe Piles under Dynamic and Static Loads

Xiao¹,

Liu²,

Zhou³

et al. 2023

Sustainability

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Pretensioned prestressed high strength concrete (PHC) pipe piles are widely used in various engineering foundations, which have the advantages of high single pile bearing capacity, strong adaptability to geological conditions and high degree of construction mechanization. In order to study the vertical compressive bearing performance and settlement characteristics of ultra-long PHC pipe piles, high strain dynamic detections and static load tests were carried out on four PHC piles with a diameter of 0.9 m on site. It can be seen from the field test that the bearing capacity of the prefabricated pipe piles was time-dependent. By the end of the dynamic test, the bearing capacity of each test pile increased by 27% to 66%. The static load test also verified the rationality of the value of the restitution coefficient. Therefore, the final bearing capacity of the pile foundation can be predicted by using the high strain initial driving results and the restitution coefficient, which can reduce the repeated driving process, effectively save the cost and improve the engineering efficiency. Under 2.1 times the design load, the change range of the pile concrete modulus is from 37.5 GPa to 52 GPa, the change range of the pile side friction resistance is from 0 kPa to 97 kPa and the change range of the pile end to pile bottom load ratio is from 0% to 7.54%. During the test, the shaft friction and end bearing of the lower part of the piles were not fully mobilized. The shaft friction resistance, the end resistance and the movement behavior of the pile top and the end of the piles can provide parameter references for the subsequent design and construction of the piles.

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An Experimental Study on Industrial Concete Pile Foundation in Soft Soil: Comparison of Monolithic and Pile with Welded Joints

Effendi,

Pratiwi,

Chairunnisa

et al. 2024

Eng. Technol. Appl. Sci. Res.

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This study presents an experimental investigation into the industrial foundation piles. The research carried out employed both destructive and non-destructive testing methods to evaluate the concrete compressive strength and flexural strength capacity of the piles under monotonic loading. The Destructive Test (DT) involves a 28-day cylinder concrete compressive test, while the Non-Destructive Test (NDT) utilizes the Ultrasonic Pulse Velocity (UPV) and Rebound Hammer (RH) tests. The flexural strength test is conducted using a loading frame, and the results are compared to the GeoPIV-RG, which measures the displacement during the test. The experimental investigations provide insights into the behavior of pile joints when subjected to monotonic load in soft and loose soil. The results indicate a significant difference between the compressive strength obtained from the DT and NDT, with a ratio of 0.64-0.74. Furthermore, the failure occurred at the joints, rather than the welded area, with the ratio of the initial stiffness of the piles with joints to the monolithic pile being 0.15 for zig-zag welded and 0.30 for circular welded, and reaching an average value of 0.225. According to the GeoPIV-RG result, the displacement is similar to the flexural strength test result.

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Experimental Study on Bending Resistance of New Type Joint of Prestressed Concrete Pipe Pile

Cited by 3 publications

References 21 publications

Bending Strength of Connection Joints of Prestressed Reinforced Concrete Pipe Piles

Bending Strength of Connection Joints of Prestressed Reinforced Concrete Pipe Piles

Field Test Study on the Bearing Capacity of Extra-Long PHC Pipe Piles under Dynamic and Static Loads

An Experimental Study on Industrial Concete Pile Foundation in Soft Soil: Comparison of Monolithic and Pile with Welded Joints

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