Study on the Flexural Performance of Prestressed Concrete Solid Square Piles and Resilient Clamping Connections

Xu, Yunsheng; Chen, Zhongfan; Fan, Jie; Li, Zhiqiang; Zhang, Kai; Tu, Xuesong

doi:10.1007/s12205-022-0148-8

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…The results of these tests and simulations confirmed that the joint specimens met the specified requirements, indicating the effectiveness and suitability of the embedded anchorage connection for its intended purpose. Xu et al [15][16][17] designed a new type of connection joint for composite reinforced concrete precast square piles. Flexural performance tests on full-size specimens revealed that the ultimate flexural capacity of this joint exceeds the calculated value of the pile specification formula, indicating excellent load-carrying capacity and deformation performance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Tensile Properties of High-Strength Bolted Joints in Static Drill Rooted Nodular Piles

Wang,

Du,

Zhang

et al. 2024

Applied Sciences

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To address the persistence of traditional welded joints in the construction of static drill rooted nodular piles, high-strength bolted connections are introduced. Tensile performance tests were conducted on seven sets of full-scale joint specimens to evaluate the ultimate tensile bearing capacity, deformation ductility, and damage characteristics of high-strength bolted joints. Numerical models were established using ABAQUS 2020 software to complement the experimental findings. The results indicate that the ultimate tensile capacity test values of high-strength bolted joints and welded joints are comparable, both exceeding the values calculated by the pile ultimate tensile capacity specification formula. Moreover, the ultimate tensile capacity values of specimens with improved high-strength bolted joints surpass those of ordinary joints. Notably, in the final stages of testing, both high-strength bolted joints and welded joints experienced pull-off at the pier head of the prestressing reinforcement, with the joints remaining intact. The load-displacement curves obtained from the ABAQUS numerical model align closely with the experimental measurements. These findings offer valuable insights and serve as an experimental foundation for promoting the adoption and utilization of high-strength bolt joints.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Tensile Properties of High-Strength Bolted Joints in Static Drill Rooted Nodular Piles

Wang,

Du,

Zhang

et al. 2024

Applied Sciences

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“…Te tensile and fexural behaviors of prestressed concrete square pile connection joint with resilient clamping were studied by Wang et al [19,20]. Te fexural performance of prestressed concrete solid square piles and resilient clamping connections were studied by Xu et al [21]. Te experimental results indicated that the head of rebar and end of plate were the weak parts of piles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flexural Behavior of Connected Precast Concrete Square Piles

Dong¹,

Dang

Gao

2023

Advances in Civil Engineering

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Part of deep foundation pit support engineering needs to select connected precast concrete square piles (CPCSPs). Under the premise that the quality of precast concrete square piles (PCSPs) meets engineering requirements, the quality of CPCSPs becomes the key factor to ensure the safety of foundation pit support structures. This paper puts forward a new connection technology of CPCSPs and carries out the flexural behavior experiment of unconnected precast concrete square piles (UPCSPs) and CPCSPs. The distribution of crack and strain on different surfaces of UPCSPs and CPCSPs are measured by carbon fiber composite strain sense optical cables, glass fiber composite strain sense optical cables, and fixed-point polyurethane strain sense optical cables. The anti-crack load, ultimate load, bending moment, and flexural deformation of UPCSPs and CPCSPs are measured. The experimental results of UPCSPs and CPCSPs are compared. The results show that the anti-crack strength of CPCSPs is greatly increased while the flexural deformation of CPCSPs is decreased before the occurrence of crack. With the development of crack (failure stage), the outside areas of hoop steel plate exhibit cracks. At this moment, the strength of CPCSPs is no longer controlled by the strength of middle areas. The ultimate strength of CPCSPs is basically equivalent to that of UPCSPs. The ultimate bending moment of CPCSPs is higher than its design value (about 66%∼76%). The selection of CPCSPs in the design of foundation pit support has good reliability.

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Experimental study on seismic performance of prestressed concrete solid square piles

Gong,

Zhao,

Fan

et al. 2024

Advances in Structural Engineering

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Prestressed concrete solid square (PCSS) piles exhibit superior lateral bearing capacity and durability compared to pretensioned spun concrete pipe piles, and are more suitable for pile foundation engineering in high-intensity seismic regions and corrosive environments. There is still a lack of research on the seismic performances of the pile body of PCSS piles. This paper presents an experimental study and the associated theoretical and finite element (FE) analyses on the seismic performance of PCSS piles. Three full-scale PCSS pile specimens were tested under lateral cyclic loads with various axial force ratios, and the results are analyzed. Following the tests, a theoretical calculation method is proposed for the bearing capacity of PCSS piles. A FE model for PCSS pile specimens is established and validated against the test observations. Based on this model, a parametric analysis is then conducted. The results show that the PCSS pile specimens all exhibit typical flexural failure. Under a low axial force ratio, the failure mode of PCSS pile specimen is governed by the tensile rupture of prestressing tendons. Under a high axial force ratio, the failure is influenced by the crushing of cover concrete, while the concrete in the core zone remains intact, and there is no outward buckling of prestressing tendons and no rupture of stirrups. Increasing the prestressing tendon ratio can simultaneously improve the bearing and deformation capacity under a lower axial force. Under higher axial force ratios, however, increasing the prestressing tendon ratio or concrete strength can improve the bearing capacity but lead to a decline in deformation capacity. Compared to pretensioned spun high-strength concrete (PHC) piles, PCSS piles exhibit better seismic behavior on aspects of deformation capacity and ductility.

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Study on the Flexural Performance of Prestressed Concrete Solid Square Piles and Resilient Clamping Connections

Cited by 4 publications

References 20 publications

Investigation of the Tensile Properties of High-Strength Bolted Joints in Static Drill Rooted Nodular Piles

Investigation of the Tensile Properties of High-Strength Bolted Joints in Static Drill Rooted Nodular Piles

Experimental Study on the Flexural Behavior of Connected Precast Concrete Square Piles

Experimental study on seismic performance of prestressed concrete solid square piles

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