Strengthening system using post-tension tendon with an internal anchorage of concrete members

Mimoto, Tatsuhiko; Sakaki, Takuya; Mihara, Takafumi; Yoshitake, Isamu

doi:10.1016/j.engstruct.2016.06.003

Cited by 12 publications

(5 citation statements)

References 16 publications

(14 reference statements)

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“…In this part, the advantage of using HSC clearly appeared. Compared to other studies, the reinforcing level of this study was lower [ 11 , 12 , 14 , 16 , 19 , 20 ]. In particular, Marchão et al [ 16 ] installed lateral reinforcements with 60 mm spacing, and the size of specimens was similar to this study.…”

Section: Resultscontrasting

confidence: 81%

“…However, SP-N-LT-3 and 4 showed satisfying strain stabilization and exceeding 1.0 Fpk. These results mean that the SP-N-LT-3 and SP-N-LT-4 specimens had the poorest performance, even smaller reinforcing and without spiral reinforcement, comparing other studies [11,12,14,16,19,20,27]. In the same way, the combination of HSC and confinement effect by lateral reinforcement (secondary confining) can be confirmed from the results of Figure 14b.…”

Section: Load-displacement and Reinforcement Strain Resultssupporting

confidence: 77%

“…In this study, the load transfer performance of post-tension anchorage members using HSC was evaluated by changing the number of lateral reinforcements and with/without spiral reinforcement. Usually, the previous studies checked the effect of the shape of the bearing plate or confirmed the performance of the developed anchorage system [ 11 , 14 , 20 ]. Therefore, it was considered that the confinement effect with HSC and simple reinforcing should be determined.…”

Section: Introductionmentioning

confidence: 99%

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Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect

et al. 2021

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Post-tensioned anchorage zones need enough strength to resist large forces from jacking forces from prestress and need spiral reinforcement to give confinement effect. High-strength concrete (HSC) has high-strength and brings the advantage of reducing material using and simplifying reinforcing. We tested strain stabilization, load–displacement, and strain of lateral reinforcements. Specimens that used one and two lateral reinforcements without spiral reinforcement did not satisfy the strain stabilization. Load capacity also did not satisfy the condition of 1.1 times the nominal tensile strength of PS strands presented in ETAG 013. On the other hand, specimens that used three and four lateral reinforcements without spiral reinforcement satisfied the strain stabilization but did not satisfy 1.1 times the nominal tensile strength of PS strands. However, the secondary confinement effect could be confirmed from strain stabilization. In addition, the affection of HSC characteristics could be confirmed from a reinforcing level comparing other studies. The main confinement effect could be confirmed from the reinforcement strain results; there was a considerable difference between with and without spiral reinforcement at least 393 MPa. Comprehensively, main and secondary confinement effects are essential in post-tensioned anchorage zones. In addition, the performance of the anchorage zone could be increased by using HSC that the combination of high-strength and confinement effect.

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Section: Resultscontrasting

confidence: 81%

Section: Load-displacement and Reinforcement Strain Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect

et al. 2021

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“…In the presented paper, simply supported prestressed composite girders with alternating prestressing levels, eccentricity of tendons, and tendon properties are examined. Mimoto et al [15] developed a strengthening system using post-tensioned tendons with internal anchorages in the existing concrete. e internal anchorage hole is made using a special drilling machine, and the system provides joints between the existing and additionally cast concrete parts.…”

Section: Introductionmentioning

confidence: 99%

Strengthening and Rehabilitation of U-Shaped RC Bridges Using Substitute Cable Ducts

Svoboda

Klusáček

Olšák

2019

Advances in Materials Science and Engineering

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e presented paper deals with strengthening and rehabilitation of U-shaped reinforced concrete bridges from the period of 1905-1930 using post-tensioning, which is a suitable, reliable, and durable method. ese bridges have two main beams pulled over the bridge deck, which is supported by cross girders. e cross girders connect the two main beams forming a half-frame in the transverse direction, which provides spatial rigidity to the structure. e spans of these bridges are usually between 15 and 25 m. e high efficiency of post-tensioning can be seen on many implemented applications for bridge reconstructions worldwide. However, in this paper, the post-tensioning method is extended by a unique structural system of substitute cable ducts that allows for significantly expanding applicability of this method on existing concrete bridges. is method is highly recommended due to minimization of interventions into the constructions, unseen method of cable arrangement, and hence the absence of impact on appearance, which is appreciated not only in case of valuable historical structures but in general as well. In conclusion, the posttensioning by monostrands in substitute cable ducts is a highly efficient method for strengthening of existing bridges in order to increase their load-bearing capacities in terms of current traffic load and to extend their service life. is method was also verified by monitoring the behavior of rehabilitated bridges before and after strengthening.

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“…Three main approaches are generally chosen to represent 1D steel members in 3D concrete structures when large-scale structures are considered [10]: the "classical" 1D approach [11], the homogenized 2D approach [12], and the richer "full 3D" approach [13,14].…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling of 1D steel components in reinforced and prestressed concrete structures

Llau

Jason

Dufour

et al. 2016

Engineering Structures

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International audienceThis paper introduces a new approach for FE modelling of 1D steel inclusions within a 3D concrete domain. Reinforcements modelled with 1D meshes, when included in 3D domains, are indeed responsible for pathological effects like stress concentration at the local scale. The alternative solution of an explicit 3D mesh of the steel elements requires a large amount of work, and a relatively fine conform mesh (and therefore, additional computation cost). It is thus hardly applicable to large-scale structures. The approach proposed in this contribution, called “1D-3D”, generates an equivalent volume from a 1D mesh of the reinforcements. Associated stresses and stiffnesses, which can be condensed on the boundaries of the newly created volume, are then applied to concrete 3D elements using kinematic relations. This approach is validated on two representative cases of civil engineering applications, including active and passive steel reinforcements. It provides results similar to an explicit 3D approach, without its meshing complexity. It thus combines the advantages of 1D and 3D approaches in a single modelling

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Strengthening system using post-tension tendon with an internal anchorage of concrete members

Cited by 12 publications

References 16 publications

Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect

Performance Assessment of the Post-Tensioned Anchorage Zone Using High-Strength Concrete Considering Confinement Effect

Strengthening and Rehabilitation of U-Shaped RC Bridges Using Substitute Cable Ducts

Finite element modelling of 1D steel components in reinforced and prestressed concrete structures

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