A Study on the Problems and Improvement of the Audit Committee and the Separated Selection System

Kwon, Do-Joong

doi:10.15539/khlj.55.2.6

Cited by 1 publication

(5 citation statements)

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“…Consequently, the model needs to be modified when applied to other wall positions. (5) The proposed model primarily addressed scenarios in which rebar is continuously arranged along the entire span of the wall without openings. Therefore, it has limitations when applied to walls with openings.…”

Section: Discussionmentioning

confidence: 99%

“…That study concluded that a lap splice can be provided beyond the designated region along the structural element if it complies with the specifications of the building codes for the development length, lapping length, and hook length of rebar, as well as concrete strength and cover and steel yield strength [17]. In addition, previous studies [5,18,19] proved that using special lengths for cutting patterns Buildings 2024, 14, 290 2 of 19 can reduce cutting waste more than using stock lengths. Thus, rebar can be arranged with flexible lap splice locations along a structural element by considering special lengths.…”

Section: Introductionmentioning

confidence: 86%

“…A reduction in the number of splices necessitates a recalculation of the total lengths to account for the revised number. This is achieved by substituting the updated number of lap splices into Equation (1), as demonstrated in Equation (5). The new number of splices is determined by subtracting 1 from the required number of rebars, as specified in Equation (4) for the top zone of the wall reinforcement.…”

Section: Generation Modelmentioning

confidence: 99%

“…While studies in diverse regions like New Zealand, Peru, and Hong Kong emphasize the substantial proportion of metal waste, particularly steel reinforcement bars (rebar) [2][3][4], the reusability of such waste poses a greater challenge compared to concrete and bricks. This challenge is further exacerbated when considering life cycle assessment (LCA), which reveals rebar's significant contribution to CO 2 emissions [5][6][7]. Approximately 60% of CO 2 emissions linked to concrete and rebar are attributed to the use of rebar [8].…”

Section: Introductionmentioning

confidence: 99%

“…It is estimated that RCW accounts for 3 to 5% of total rebar usage. Steel rebar generates 9.2 times more CO 2 than concrete [5,9]. Therefore, moving beyond mere rebar waste management, it is crucial to explore strategies to minimize its generation and mitigate its environmental consequences amidst rapid population growth and construction demands [10].…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%