Optimizing Reinforcing Re-Bar for Multi-Story Buildings Using Automated Bending Lists

Document Type : Original Article

Authors

1 Civil Engineering Department, Giza Engineering Institute

2 Civil Engineering Department, Cairo Higher Institute for Eng., Computer Science and Management

Abstract

Controlling amounts of reinforcing re-bar during construction project phases enables contractors to reduce total direct cost of R.C. leading to final com-petitive prices. In this study a computer software RCD-2, using Auto-Lisp Language as a support to Auto-Cad software, is designed to help both designers and con-tractors to automatically produce design and fabrication drawings and bending lists for reinforced concrete sub-systems. The economic implications of using such system is to reduce engineering hours since fabrication drawings are executed au-tomatically leading to savings in both time and cost. An optimization strategy has been developed to help engineers to improve the over all steel bars utilization using the previously produced drawings and bending lists. The optimization process is executed through using several optimization cycles until a minimum amount of used steel bars is reached. A case study of a typical seven stories R.C building with raft foundation is presented. Design and fabrication drawings and reinforcing re-bar bending lists of foundation, columns and slabs (flat slabs) sub-systems were au-tomatically produced. Original re-bars utilization ratio was found to be 88.25%. Optimization cycles were performed for several design alternatives. For each al-ternative, same types of drawings and bending lists were produced. The optimiza-tion procedure suggested in the study was applied and utilization ratio was im-proved to 95.75% resulting a reduction of total steel amount by 8.5%. It is concluded that the proposed technique is an effective and efficient tool for practicing engi-neers and contractors to reduce R.C. subsystems cost. 

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Fayoum University Journal of Engineering
Volume 7, Issue 2
Special Issue, Selected papers from the Third International Conference on Advanced Engineering Technologies for Sustainable Development ICAETSD, held on 21-22 November 2023
2024
Pages 232-236

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