Cyclic performance and simplified pushover analyses of precast segmental concrete bridge columns with circular section

Bu, Zhan-Yu; Guo, Jian; Zheng, Rong; Song, Jianwei; Lee, George C.

doi:10.1007/s11803-016-0323-3

Cited by 48 publications

(9 citation statements)

References 17 publications

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“…The parameters include the aspect ratio, the ED bar ratio, the strength-yield ratio of ED bars, the unbonded length ratio of ED bars, the gravity loading ratio, the initial PT stress, and the PT tendon ratio. 16,[30][31][32] Prototype dimensions of tested specimens are used in the parametric analysis to accurately consider the size effect of bar-slip and the P-Δ effect. The prototype of specimen S-3 is selected to be the reference marked by specimen PS, of which design parameters are shown in Table 3.…”

Section: Parametric Analysis On Ed and Self-centering Capacitiesmentioning

confidence: 99%

“…15 For example, using more ED bars may improve ED capacity and weaken self-centering capacity. Although some suggestions are proposed to control the amount of ED bars to ensure good self-centering capacity based on results of limited experiments, 3,5 there are few researches concentrating on the contradictory 16,17 and more attentions are paid to cyclic loading tests and analytical model of lateral deformation. 2,4 Is there a measure to enhance self-centering capacity and have no significant effects on ED capacity?…”

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confidence: 99%

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Energy dissipation and self‐centering capacities of posttensioning precast segmental ultra‐high performance concrete bridge columns

Wang

Zhu

et al. 2019

Structural Concrete

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The research aims to better balance energy dissipation (ED) and self-centering capacities of posttensioning (PT) precast segmental ultra-high performance concrete bridge columns by adjusting common design parameters. A numerical model is established based on the equivalent plastic hinge model and validated by the cyclic loading test. The validated model is used to conduct a parametric study to investigate the effects of seven common design parameters on ED and self-centering capacities. The results show the proposed numerical model can accurately predict ED and self-centering capacities of the proposed bridge columns. The effect of the strength-yield ratio can be neglected when it is more than 1.2. The lower aspect ratio can first weaken and then improve the equivalent viscous damping ratio with drift ratio up, while the lower aspect ratio can reduce the residual drift ratio. With larger ED bar ratio, smaller unbonded length of ED bars and lower PT tendon ratio, the equivalent viscous damping ratio, and the residual drift ratio are significantly increased. It is not a perfect way to improve ED capacity by increasing the ED bar ratio, which can significantly magnify the residual drift ratio and limitedly enhance the equivalent viscous damping ratio, besides economical considering. Improving the gravity loading ratio and the initial PT stress are deemed to be effective ways to reduce the residual drift ratio because they not only have little influence on the equivalent viscous damping ratio but also result in no more costs. K E Y W O R D Sbridge columns, numerical model, parametric analysis, precast segmental construction, self-centering, ultra-high performance concrete

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Section: Parametric Analysis On Ed and Self-centering Capacitiesmentioning

confidence: 99%

mentioning

confidence: 99%

Energy dissipation and self‐centering capacities of posttensioning precast segmental ultra‐high performance concrete bridge columns

Wang

Zhu

et al. 2019

Structural Concrete

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“…The modeling techniques of precast segmental piers were described and schematically shown in Figure . OpenSees platform was used for fiber modeling …”

Section: Verification Of the Proposed Equationsmentioning

confidence: 99%

“…OpenSees platform was used for fiber modeling. 23 Column segments were created using DispBeamColumn element, of which section was composed with cover concrete fiber, core concrete fiber, ED bar fiber, and longitude bar fiber, as shown in Figure 8. Both cover concrete and core concrete were modeled with Concrete02 material model, which was shown in Figure 9a and provided by OpenSees platform.…”

Section: Verification Of the Proposed Equationsmentioning

confidence: 99%

Axial compression ratio limit for self‐centering precast segmental hollow piers

Wang

Liu

2017

Structural Concrete

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Axial compression ratio limit was investigated for self‐centering precast segmental hollow piers based on post‐earthquake residual axial loading capacity. The analytical method of unbonded posttensioning tendons (PT) stress increment and the simplified method of compression zone height were developed and validated by the finite element model verified by experiments. An analytical formula was deduced to calculate the critical axial compression ratio, which was regarded as the limit and can be obtained when the capacity provided by the noncompression zone at the bottom is equal to the initial axial compression loading. Parameter analysis was conducted to study effects of eight common design parameters on the critical axial compression ratio. The conclusions are summarized that there is good accuracy between the proposed methods for both unbonded PT stress increment and compression zone height and the finite element analysis. The axial compression ratio limit is proposed to be 0.25 when the ratio of energy dissipation (ED) bars is <1.5%. It is an inadvisable solution that more ED bars are matched with higher initial tensioning force of unbonded PT to fulfill the precast segmental piers with good ED capacity and self‐centering capacity in practice.

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“…For a precast segmental pier, longitudinal ED bars remain continuous across the segmental joints, and consume the majority of input earthquake energy (Bu et al, 2016). Therefore, mechanical properties of the ED bars greatly affect a precast segmental pier’s seismic behaviors.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on cyclic behaviors of precast segmental bridge piers with the hybrid of high-strength bars and unbonded prestressing tendons

Tong

Yuan

Zhuo

et al. 2020

Advances in Structural Engineering

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Precast segmental piers are gaining increasing attentions in low-medium seismic-risked regions. In this paper, cyclic behaviors of two precast segment piers reinforced with the hybrid of high-strength energy dissipation (“H” ED, ≥500 MPa) bars and unbonded tendons were experimentally investigated, accompanied with another two piers reinforced with merely “H” ED bars for the comparative study. It was observed that unbonded tendons benefitted the segmental piers in rising the lateral strength and mitigating the residual drift. On the other aspect, the tendons also made concrete prone to damage. Alongside, the finite element (FE) model is constructed for the four tested segmental piers, discritized with the displacement-controlled beam-colum element with a fiber section. With the bond-slip behavior of the “H” ED bars being incorporated, the numerical model accurately reflects the piers’ seismic behaviors.

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Cyclic performance and simplified pushover analyses of precast segmental concrete bridge columns with circular section

Cited by 48 publications

References 17 publications

Energy dissipation and self‐centering capacities of posttensioning precast segmental ultra‐high performance concrete bridge columns

Energy dissipation and self‐centering capacities of posttensioning precast segmental ultra‐high performance concrete bridge columns

Axial compression ratio limit for self‐centering precast segmental hollow piers

Experimental and numerical investigations on cyclic behaviors of precast segmental bridge piers with the hybrid of high-strength bars and unbonded prestressing tendons

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