Improved performance-based plastic design method for post-tensioned connection systems

Moradifard, Reza; Alibazi, Ali; Shiravand, M.R.; Gholami, Mohammad

doi:10.1016/j.engstruct.2022.113931

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…Building frames and their connections have also benefited from this mechanism. 1,2 The study of structures with rocking motion is not a new subject. The first research done in this regard goes way back to 1963 to the research done by Housner.…”

Section: Introductionmentioning

confidence: 99%

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Segments arrangement effect on improvement of self‐centering precast post‐tensioned segmental piers seismic performance

Poorahad Anzabi,

Shiravand

2023

Structural Concrete

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In bridge engineering, the use of precast post‐tensioned segmental (PPS) piers is increasingly expanding due to the Accelerated Bridge Construction viewpoint. Recent experimental and numerical researches have studied general seismic performance and nonlinear behavior of PPS piers without much attention to segment arrangements or joint openings. The aim of this paper is to utilize innovative segment arrangements to reduce the residual deformation, without reducing the energy dissipation capacity of PPS piers with internal energy dissipation (ED) bars. For this purpose, nonlinear rocking dynamics of a multiple‐block assembly of tied rigid rocking blocks equipped with ED bars at joints are firstly developed so that uplift moment for each joint is derived to obtain the threshold joint opening height (height above which no joint opens). Then, nonlinear static, quasi‐static, and dynamic analyses are conducted on different segment arrangements of finite element models of PPS piers. It is proposed to place more segments within the threshold joint opening height by using unequal segments so that the total rotation is shared among critical joints (joints that open), and the nonlinear extent of ED bars at the bottom joint is reduced, resulting in the reduced residual deformation. It is also proposed to place a lower ratio of ED bars at the critical intermediate joints or place ED bars of a lower yield stress there so that the intermediate joints can be more effective even with small rotations. Results indicate that using the proposed segment arrangement, enhances both seismic and post‐earthquake performance of PPS piers.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Combination of rocking and self‐centering mechanism is not only limited to bridge piers. Building frames and their connections have also benefited from this mechanism 1,2 …”

Section: Introductionmentioning

confidence: 99%

Segments arrangement effect on improvement of self‐centering precast post‐tensioned segmental piers seismic performance

Poorahad Anzabi,

Shiravand

2023

Structural Concrete

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show abstract

“…Combination of rocking and self-centering mechanism is not only limited to bridge piers. Building frames and their connections have also benefited from this mechanism (Kibriya, et al, 2018;Moradifard, et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Segments arrangement effect on improvement of self-centering PPS piers seismic performance

Anzabi

Shiravand

2022

Preprint

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In bridge engineering, the use of precast post-tensioned segmental (PPS) piers is increasingly expanding due to the Accelerated Bridge Construction viewpoint. Recent experimental and numerical researches have studied general seismic performance and nonlinear behavior of PPS piers without much attention to segment arrangements or joint openings. The aim of this paper is to utilize innovative segment arrangements to reduce the residual deformation, and also enhance the energy dissipation capacity of PPS piers with internal energy dissipation (ED) bars. For this purpose, nonlinear rocking dynamics of a multiple-block assembly of tied rigid rocking blocks equipped with ED bars at joints are firstly developed so that uplift moment for each joint is derived to obtain the threshold joint opening height (height above which no joint opens). Then, nonlinear static, quasi-static, and dynamic analyses are conducted on different segment arrangements of finite element models of PPS piers. It is proposed to place more segments within the threshold joint opening height by using unequal segments so that the total rotation is shared among critical joints (joints that open), and the nonlinear extent of ED bars at the bottom joint is reduced, resulting in the reduced residual deformation. It is also proposed to place a lower ratio of ED bars at the critical intermediate joints or place ED bars of a lower yield stress there so that the intermediate joints can be more effective even with small rotations. Results indicate that using the proposed segment arrangement, enhances both seismic and post-seismic performance of PPS piers.

show abstract

Seismic reliability analysis of self-centering post-tensioned piers under influence of prestress loss

Poorahad Anzabi,

Shiravand

2024

Engineering Structures

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Improved performance-based plastic design method for post-tensioned connection systems

Cited by 7 publications

References 47 publications

Segments arrangement effect on improvement of self‐centering precast post‐tensioned segmental piers seismic performance

Segments arrangement effect on improvement of self‐centering precast post‐tensioned segmental piers seismic performance

Segments arrangement effect on improvement of self-centering PPS piers seismic performance

Seismic reliability analysis of self-centering post-tensioned piers under influence of prestress loss

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