Seismic performance and reparability assessment of recycled aggregate concrete columns with ultra-high-strength steel bars

Zhang, Jianwei; Liu, Xiao; Liu, Juan; Zhang, Man; Cao, Wanlin

doi:10.1016/j.engstruct.2022.115426

Cited by 22 publications

(1 citation statement)

References 39 publications

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“…The former provided the RC components with high lateral resistance, while the latter could prevent the premature yielding of WBUHS rebars from endowing both drift-hardening capacity and self-centering capacity. Experimental research has confirmed the feasibility of WBUHS rebars in providing resilience for both square and circular RC columns, regardless of whether they were subjected to high axial compression or deformed in double curvature [26][27][28][29]. In addition, more pronounced resilience can be expected when concrete columns are confined by bolted steel tubes, especially those with circular sections [30].…”

Section: Introductionmentioning

confidence: 75%

Seismic Behavior of Concrete Columns Reinforced with Weakly Bonded Ultra-High Strength Rebars and Confined by Steel Tubes

Luo,

Yuan,

Zhao

et al. 2023

Materials

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The usage of weakly bonded ultra-high strength (WBUHS) rebars has emerged as a promising approach to enhance the resilience of concrete components due to their remarkable mechanical properties. To promote the application of WBUHS rebars, this paper presented an investigation on the seismic behavior of circular concrete columns reinforced with squarely arranged WBUHS rebars and externally confined by bolted steel tubes. Eight columns, including two reinforced with normal strength (NS) rebars and six reinforced with WBUHS rebars, were fabricated and tested under reversed cyclic lateral loading. Experimental results showed that the columns reinforced with WBUHS rebars exhibited remarkable drift-hardening capacity up to the drift of at least 5% as well as significantly reduced residual deformation even when subjected to relatively high axial compression with an axial load ratio of 0.33 in comparison to the traditional ductile columns reinforced with NS rebars. Notably, the precast columns reinforced with WBUHS rebars, with an embedment length of 20 times their diameter, behaved nearly identically in terms of resilience as cast-in-place columns. Additionally, a numerical analysis was performed to assess the hysteretic performance, and the analytical results, with consideration for the slippage of WBUHS rebars, were capable of capturing the hysteretic performance of test columns.

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