Role of coupler in structural behavior of RC elements

Moka, Vijay Tarun Kumar; Rajendran, Siva Chidambaram

doi:10.1016/j.matpr.2022.05.097

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…A variety of couplers are commercially accessible and available on the market, namely, (1) shear screw couplers [31,32], (2) grouted sleeve couplers [31,32], (3) parallel threaded couplers [4,31,32], (4) swaged couplers [4,31,32], and (5) rib-thread couplers [4,31,32], as illustrated in Figure 1. Threaded couplers are the most prevalent type of coupler, characterized by their short length and ease of installation [14,33]. Threaded couplers can be categorized as parallel threaded couplers (PTCs), taper threaded couplers (TTCs), upset-headed couplers (UHCs), and rib-thread couplers (RTCs) [34].…”

Section: Rebar Splicing Methodsmentioning

confidence: 99%

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Optimizing Rebar Consumption and Cutting Waste in Column Reinforcement: Integrated Mechanical Couplers and a Special-Length-Priority Minimization Algorithm

Widjaja,

Kim,

Kim

2024

Buildings

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The construction of reinforced concrete (RC) structures inevitably consumes an excessive number of rebars, leading to significant cutting waste and carbon emissions. Extensive research has been conducted to minimize this issue and its consequences; however, these methods consistently consume a substantial number of rebars. This includes a previous study that utilizes the lap splice position optimization and special-length rebar concept without considering the lapping zone regulation. Moreover, conventional lap splices pose inherent drawbacks that could jeopardize the structural integrity of RC members. In contrast, mechanical couplers eliminate the need for rebar lapping, effectively reducing rebar consumption. This research aims to evaluate the impact of an integrated mechanical coupler and special-length-priority minimization algorithm on the reduction in rebar consumption and cutting waste in RC columns, achieving near-zero cutting waste. To validate the effectiveness of the proposed algorithm, it was applied to the column rebars of an RC building. The results revealed a significant reduction in the ordered rebar consumption by 18.25%, accompanied by substantial reductions in the cutting waste (8.93%), carbon emissions (12.99%), and total costs (9.94%) compared with a previous study. The outcomes provide the industry with insights into further reducing rebar consumption and its related consequences. Applying the proposed algorithm to various construction projects will further amplify the corresponding benefits.

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Section: Rebar Splicing Methodsmentioning

confidence: 99%

“…In addition, the application of conventional lap splicing has several drawbacks, including rebar congestion, increased rebar waste, higher costs, and impaired structural integrity [4,[10][11][12][13][14][15]. The emergence of mechanical splices or couplers sheds light on this issue.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Rebar Consumption and Cutting Waste in Column Reinforcement: Integrated Mechanical Couplers and a Special-Length-Priority Minimization Algorithm

Widjaja,

Kim,

Kim

2024

Buildings

View full text Add to dashboard Cite

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“…The five types of couplers that are readily available are (1) shear screw couplers, (2) headed bar couplers, (3) grouted sleeve couplers, (4) threaded couplers, and (5) swaged couplers [37]. The most prevalent type is the threaded coupler, characterized by its short length and ease of installation [39,40]. Four types of threaded couplers are commonly used: parallel threaded couplers (PTC), taper threaded couplers (TTC), upset-headed couplers (UHC), and rib thread couplers (RTC) [41].…”

Section: Shokrzadeh Et Al [31]mentioning

confidence: 99%

Optimization of Rebar Usage and Sustainability Based on Special-Length Priority: A Case Study of Mechanical Couplers in Diaphragm Walls

Widjaja,

Khant,

Kim

et al. 2024

Sustainability

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The construction industry generates significant CO2 emissions and reinforcing bars (rebar), which are a major contributor to this environmental impact. Extensive research has been conducted to address this particular issue. Recent research advances have introduced algorithms to reduce rebar waste and consumption, demonstrating the feasibility of achieving near-zero rebar cutting waste (N0RCW) through the consideration of special-length rebars. However, conventional lap splices, the most common rebar joint method, continue to consistently consume excessive quantities of rebar, despite extending beyond their mandated zones. Conversely, couplers can eliminate rebar lengths required for lapping splices, reducing the usage of rebar. Applying special-length rebars and couplers in heavily loaded structures like diaphragm walls can also significantly reduce rebar usage and cutting waste, consequently reducing CO2 emissions and the environmental and economic impacts. This research aims to optimize rebar consumption and sustainability in diaphragm wall structures by integrating mechanical couplers with a special-length rebar approach. A case study confirmed a substantial reduction in purchased rebar usage (17.95% and 5.38%), carbon emissions (15.24% and 2.25%), water footprint (17.95% and 5.38%), and environmental impact (95.18% and 30.27%) compared to the original design and recent diaphragm wall study, respectively. The broad implementation of the proposed method across various buildings and infrastructure projects could further multiply these benefits, enabling the achievement of the sustainable development goals (SDGs) adopted by the United Nations to foster sustainable construction.

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Role of coupler in structural behavior of RC elements

Cited by 2 publications

References 15 publications

Optimizing Rebar Consumption and Cutting Waste in Column Reinforcement: Integrated Mechanical Couplers and a Special-Length-Priority Minimization Algorithm

Optimizing Rebar Consumption and Cutting Waste in Column Reinforcement: Integrated Mechanical Couplers and a Special-Length-Priority Minimization Algorithm

Optimization of Rebar Usage and Sustainability Based on Special-Length Priority: A Case Study of Mechanical Couplers in Diaphragm Walls

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