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<p>High-strength reinforcement bars are gaining popularity in construction due to their cost-effectiveness and ability to reduce rebar congestion in joints, allowing for better concreting. The 2020 Bangladesh National Building Code (BNBC) limits reinforcement up to Grade 550&#xa0;MPa (80 ksi) for general use and Grade 420&#xa0;MPa (60 ksi) for special reinforced concrete moment frames (SMF). In contrast, ACI 318 − 19 allows up to Grade 690&#xa0;MPa (100 ksi) for general cases and Grade 550&#xa0;MPa (80 ksi) for SMF, reflecting a trend in developed countries toward high strength reinforcement bar. This study explores the impact of high-strength reinforcement bar on material efficiency particularly for rebar in Bangladesh’s construction industry, focusing on Grade 500 (500&#xa0;MPa) and Grade 600 (600&#xa0;MPa) reinforcement in six, ten, fifteen, and twenty-storied buildings designed for seismic Zone-II. It compares BNBC-2020 and ACI 318 − 19 standards for 400&#xa0;MPa, 500&#xa0;MPa and 600&#xa0;MPa reinforcement bar, respectively. By analyzing rebar quantities in beams, columns, slabs, and mats, the study quantifies material savings from higher-grade reinforcement. Results show that Grade 500 and 600 significantly reduce total rebar demand compared to Grade 400: in six-storied buildings, savings were 7.93% and 11.93%, while in twenty-storied buildings, savings dropped to 7.06% and 11.04%. Beams showed reductions of 9.5% and 13.2% in six-storied buildings and 8.9% and 13.9% in twenty-storied buildings. For columns, savings were 7.8% and 10.8% in six-storied building and 5.8% and 7.0% in twenty-storied ones. Beyond material savings, the research underscores the environmental and economic benefits, contributing to reduced carbon footprints and more cost-effective construction practices. This paper makes a significant case for revising local construction practices to allow the use of high strength reinforcement, thus enhancing the sustainability and efficiency of future construction projects.</p>

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Variation in reinforcement consumption patterns in RC building designed with a range of reinforcement grade

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Md. Kamruzzaman,
  • Rajib Kanti Biswas,
  • Md. Shafiqur Rahman,
  • Md. Sohel Rahman,
  • Md. Rafiqul Islam,
  • Haisam Bin Mahbub

摘要

High-strength reinforcement bars are gaining popularity in construction due to their cost-effectiveness and ability to reduce rebar congestion in joints, allowing for better concreting. The 2020 Bangladesh National Building Code (BNBC) limits reinforcement up to Grade 550 MPa (80 ksi) for general use and Grade 420 MPa (60 ksi) for special reinforced concrete moment frames (SMF). In contrast, ACI 318 − 19 allows up to Grade 690 MPa (100 ksi) for general cases and Grade 550 MPa (80 ksi) for SMF, reflecting a trend in developed countries toward high strength reinforcement bar. This study explores the impact of high-strength reinforcement bar on material efficiency particularly for rebar in Bangladesh’s construction industry, focusing on Grade 500 (500 MPa) and Grade 600 (600 MPa) reinforcement in six, ten, fifteen, and twenty-storied buildings designed for seismic Zone-II. It compares BNBC-2020 and ACI 318 − 19 standards for 400 MPa, 500 MPa and 600 MPa reinforcement bar, respectively. By analyzing rebar quantities in beams, columns, slabs, and mats, the study quantifies material savings from higher-grade reinforcement. Results show that Grade 500 and 600 significantly reduce total rebar demand compared to Grade 400: in six-storied buildings, savings were 7.93% and 11.93%, while in twenty-storied buildings, savings dropped to 7.06% and 11.04%. Beams showed reductions of 9.5% and 13.2% in six-storied buildings and 8.9% and 13.9% in twenty-storied buildings. For columns, savings were 7.8% and 10.8% in six-storied building and 5.8% and 7.0% in twenty-storied ones. Beyond material savings, the research underscores the environmental and economic benefits, contributing to reduced carbon footprints and more cost-effective construction practices. This paper makes a significant case for revising local construction practices to allow the use of high strength reinforcement, thus enhancing the sustainability and efficiency of future construction projects.