Residual displacements of reinforced concrete walls detailed with conventional steel and shape memory alloy rebars

Hoult, Ryan; Almeida, João Pacheco de

doi:10.1016/j.engstruct.2022.114002

Cited by 8 publications

(3 citation statements)

References 67 publications

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“…These characteristics assist in identifying the factors that influence rebar usage and RCW in wall structures. In reinforced concrete (RC) buildings, structural walls function as the principal lateral load-resisting system, resisting wind and earthquake-induced forces and displacement [46]. The typical configuration of reinforcement in RC walls encompasses both vertical and horizontal steel bars, spaced and secured on both sides of the wall [32,47,48].…”

Section: Identification Of Factors Influencing Wall Rebar Usage and C...mentioning

confidence: 99%

Special Length Priority Optimization Model: Minimizing Wall Rebar Usage and Cutting Waste

Kim,

Khant,

Widjaja

et al. 2024

Buildings

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The production of steel rebar is an energy-intensive process that generates CO2 emissions. In construction, waste is generated by cutting stock-length rebar to the required lengths. The reduction rate achieved in most previous studies was limited due to adherence to lap splice positions mandated by building codes and the use of stock-length rebar. A previous study demonstrated a significant reduction in rebar usage and cutting waste, approaching zero, upon optimizing the lap splice position, reducing the number of splices, and utilizing special-length rebar. However, the reference length used to determine the special-length rebar was not clearly optimized. This study proposes a special length priority optimization model to minimize wall rebar usage and waste by reducing the number of splices while simultaneously ensuring an optimal reference length. The proposed model was validated using a case study wall with a standard hook anchorage at the top of the wall reinforcement. The optimization model reduced rebar cutting waste to 0.18% and decreased rebar usage from the original design by 16.16%.

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Section: Identification Of Factors Influencing Wall Rebar Usage and C...mentioning

confidence: 99%

Special Length Priority Optimization Model: Minimizing Wall Rebar Usage and Cutting Waste

Kim,

Khant,

Widjaja

et al. 2024

Buildings

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“…In high-intensity zones, reinforced concrete frame structures are susceptible to large seismic forces under earthquakes and have severe structural damage and large residual deformations after earthquakes, which complicate repair. For this reason, there is an urgent need to study the seismic performance of buildings under different frame structures to ensure the play of structural ductility during strong earthquakes and to improve the speed of structural function repair [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Application and Performance Evaluation of Superelastic Shape Memory Alloys in Building Vibration Isolation Systems

Chen,

Zheng

2024

Applied Mathematics and Nonlinear Sciences

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In this study, the intrinsic model of Shape Memory Alloys (SMA) is employed to facilitate a comprehensive analysis of the phase transition process, encapsulating the evolution of stress and strain across varying temperatures. The martensite volume fraction is quantitatively described using a cosine function, culminating in the formulation of a cosine-type SMA phase transition equation. This model enables the simulation of superelasticity, shape memory effects, and the elastic-thermal behavior of SMA by varying the loading conditions. This approach allows for an assessment of how different material parameters influence SMA properties. Notably, the results highlight that the heating temperature significantly affects the hyperelastic energy dissipation properties of SMA. The energy dissipation coefficient increased by 15.3% when the temperature was increased from 350 to 550 and decreased by 36.3% when the temperature was increased from 550 to 650. The peak values of top acceleration and interstorey displacement of the SMA-isolated structure were 0.826 m/s² and 0.641 mm for EL-centro waves at 7+ seismic intensities. The values of non-isolated were 1.151 m/s², 0.856 mm. 10 ground shaking, the SMA braced structure relative to the steel frame structure on the maximum peak inter-story displacement angle and the structure of the top layer of the permanent displacement, have different degrees of reduction. Therefore, the SMA material possesses good damping performance in the seismic isolation system.

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“…The steel bars in the boundary elements of structural walls will experience a more considerable tensile strain. It can be considered that the yielding and non-elastic behavior of the steel bars in boundary elements are the one of the main causes of residual deformation (permanent deformation) (Hoult and de Almeida 2022). Therefore, earlier research applied prestressed tendons in structural components to recover to the pre-earthquake state, namely the resilient performance.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Seismic and Resilient Performance of Resilient Walls with Concealed Bracings: Experimental and Numerical Investigation

Zhang,

Sun

et al. 2024

Preprint

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Resilient walls incorporating ultra-high-strength bars (UHSB) with weak bond performance are expected to exhibit drift-hardening properties. Thus, to improve the shear stiffness and lateral resistance of the resilient walls, the present research applied the concealed bracings composed of UHSB to the resilient walls and explored the effect on the hysteretic and resilient performance of the proposed walls. Five walls were tested to investigate the effect of relevant variables, including shear span ratio, the presence of steel fibers and recycled aggregate concrete (RAC) strength, on the hysteretic performance and resilience. Reinforced with bracings, test wall showed satisfactory hysteretic and resilient performance up to 2% drift ratio and maintained stable increase in lateral force. Concealed bracings consisted of UHSB were also conducive to reducing residual drift ratio, ranging from 8.7–31.3%. Residual drift ratios of all test walls were within the limit value of 0.5%, until a loading drift ratio of 2%. Additionally, adding steel fibers restricted the development of cracks and had a positive effect on slowing down stiffness degradation. Numerical models were established based on OpenSees platform, and more resilient-related parameters were analyzed, including reinforcement ratio and arrangement height of the concealed bracing ratio, longitudinal reinforcement ratio, axial ratio, and UHSB replacement ratio. Based on the parameter analysis results, design recommendations were given.

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Residual displacements of reinforced concrete walls detailed with conventional steel and shape memory alloy rebars

Cited by 8 publications

References 67 publications

Special Length Priority Optimization Model: Minimizing Wall Rebar Usage and Cutting Waste

Special Length Priority Optimization Model: Minimizing Wall Rebar Usage and Cutting Waste

Application and Performance Evaluation of Superelastic Shape Memory Alloys in Building Vibration Isolation Systems

Enhancing Seismic and Resilient Performance of Resilient Walls with Concealed Bracings: Experimental and Numerical Investigation

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