Influencing factors of residual drifts of precast segmental bridge columns with energy dissipation bars

Cai, Zhong-Kui; Zhou, Zheng; Wang, Zhenyu

doi:10.1177/1369433218780545

Cited by 22 publications

(7 citation statements)

References 35 publications

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“…A similar simulation method is adopted to model the unbonded segments of the energy dissipation (ED) bars. Truss elements with Reinforcing Steel material are used to model the ED bars, and the ultimate stress is set to 1.35 times as much as the yield stress fy (Priestley et al 2007); the ratio of the tangent at initial strain hardening to the initial elastic tangent can be set to 0.01-0.05 (Cai et al 2019) (0.03 is selected in this study), the ratio of strain corresponding to the initial strain hardening to the yield strain can be set to 3-5 (Cai et al 2019) (3 is selected in this study), and the ultimate strain can be set to 0.1 (Kowalsky et al 1995 The total unbonded length of ED bars in numerical model, Lub, consists of two parts. One is the designed unbonded length (L0) which can prevent the early fracture of ED bars, the other is the equivalent unbonded length (Leu) caused by the strain penetration.…”

Section: Simulation Methodsmentioning

confidence: 99%

Numerical Investigation of Residual Displacement of Rocking Self-Centering Columns Under Cyclic Loading

Shi

Zhong

Zhang

et al. 2021

Preprint

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Well-designed rocking self-centering (RSC) columns are capable of achieving small residual displacement. However, few studies conducted the quantitative analysis for the residual displacement of RSC columns. The residual displacement is the product of the struggle between the self-centering (SC) capacity and the energy dissipation (ED) capacity. In this study, a SC factor and an ED parameter were defined to reflect the SC and ED capacity of the RSC column, respectively. The influence of eight common design parameters on the SC factor and the ED parameter was explored using factorial analysis. Parametric analysis was performed to investigate the tendency of the SC factor and the ED parameter with the increase of maximum drift. According to the results of the parametric analysis, the effect of the SC factor and the ED parameter on the distribution of the residual drift was researched statistically. A simplified formula was proposed to calculate the upper limit of the residual drift. What is more, a set of predictive regression formulas was established to estimate the actual residual drift, these regression formulas have an applicable condition that the ED parameter should be larger than 0.75. When the ED parameter was less than 0.75, the residual drift is approximate to zero.

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Section: Simulation Methodsmentioning

confidence: 99%

Numerical Investigation of Residual Displacement of Rocking Self-Centering Columns Under Cyclic Loading

Shi

Zhong

Zhang

et al. 2021

Preprint

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“…Simplified analytical models ( (Chou and Chen 2006), (Ou et al 2007)) were also developed to predict cyclic behaviour of the PPS piers. Cai et al (2019)…”

Section: Previous Studiesmentioning

confidence: 99%

Seismic vulnerability assessment of precast post-tensioned segmental bridge piers subject to far-fault ground motions

Ahmadi

Kashani

2021

Structures

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“…Numerous research papers have proposed to improve the hysteretic ED ability of precast bridge piers by using mild steel bars over the segment joints [20][21][22][23][24]. Under seismic loading, the precast hybrid system obtains SC by rocking the precast elements over the unbonded tendons and dissipating energy via mild steel bars.…”

Section: Introductionmentioning

confidence: 99%

Self-Centering Precast Unit as Energy Dissipation Members in Precast Segmental Bridge Columns

Moussa,

Fahmy,

Niu

et al. 2024

Buildings

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This research aims to present a new generation of seismic-resisting systems designed for precast reinforced concrete (RC) bridge piers in modern sustainable cities to withstand moderate to high seismic activity. The proposed system consists of two self-centering (SC) systems operating in parallel to bring together all features of the required resiliency during a seismic action. The first/main system is a hollow core precast segmental bridge column, and the second is composed of an SC precast unit and energy dissipation (ED) steel reinforcements positioned in the main pier segment’s hollow core. To study the performance of the proposed system, a finite element model was first developed to capture the behavior of experimentally tested precast bridge columns. After validation, the created model was systematically studied to investigate the performance of the entire proposed system under cyclic loading. The effects of three parameters related to the ED system were investigated, including the reinforcement ratio, the unbonded length of ED bars, and the SC post-tensioned force ratio. Furthermore, the impact of FRP wrapping on the lower part of the core column of the ED system was also investigated. An analytical model predicting the characteristic points of the lateral response of the proposed system based on the superposition concept is also proposed. The FE results showed that the entire proposed system is a new design-based resilient system with the ability to dissipate energy without compromising the SC capacity of the main resisting system. Compared to the typical precast hollow core segmental column, a 6% reinforcement ratio of the ED unit can cause a 60% increase in lateral resistance and a 220% increase in the ED capacity. The analytical model can successfully be applied in the design of the proposed system to provide customized ED capabilities and controlled lateral resistance.

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Influencing factors of residual drifts of precast segmental bridge columns with energy dissipation bars

Cited by 22 publications

References 35 publications

Numerical Investigation of Residual Displacement of Rocking Self-Centering Columns Under Cyclic Loading

Numerical Investigation of Residual Displacement of Rocking Self-Centering Columns Under Cyclic Loading

Seismic vulnerability assessment of precast post-tensioned segmental bridge piers subject to far-fault ground motions

Self-Centering Precast Unit as Energy Dissipation Members in Precast Segmental Bridge Columns

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