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Design and Cost Analysis of Headed Bars as Mechanical Anchorage System for Reinforced Concrete Beam-Column Joints
https://orcid.org/http://orcid.org/0000-0003-2779-9011
https://orcid.org/http://orcid.org/0000-0001-6595-2465
In reinforced concrete (RC) frames, anchorage system of conventional development length and standard 90º or 180º bend hooked bar anchor terminating at the joint, protruding into the face of the column, have many drawbacks such as reinforcement congestion, improper concreting and compaction, honeycombing, which ultimately leads to joint strength deterioration and joint damage during the earthquakes. Moreover, development length requires high amount of steel, which leads to depletion of natural resources, along with increased cost. This evolved need for development of alternate anchorage systems such as headed bars, which have the potential to eliminate the shortcomings of conventional anchorage without any compromise on economy. Headed bar is formed by welding or threading a steel anchor at the end of beam reinforcement bar. This paper presents design and cost analysis of headed bars which can serve as anchorage for RC beam-column joints. It bestows a cost-effective and construction-efficient alternative to anchorage system of conventional development length. Design specifications in the form of geometrical recommendations for headed bars are made based on pull-out tests. The paper further derives the equation of development length and demonstrates cost-effectiveness of headed bars through rigorous cost analysis and comparison with costing of anchorage system of conventional development length for different rebar diameters.
Design and Cost Analysis of Headed Bars as Mechanical Anchorage System for Reinforced Concrete Beam-Column Joints
https://orcid.org/http://orcid.org/0000-0003-2779-9011
https://orcid.org/http://orcid.org/0000-0001-6595-2465
In reinforced concrete (RC) frames, anchorage system of conventional development length and standard 90º or 180º bend hooked bar anchor terminating at the joint, protruding into the face of the column, have many drawbacks such as reinforcement congestion, improper concreting and compaction, honeycombing, which ultimately leads to joint strength deterioration and joint damage during the earthquakes. Moreover, development length requires high amount of steel, which leads to depletion of natural resources, along with increased cost. This evolved need for development of alternate anchorage systems such as headed bars, which have the potential to eliminate the shortcomings of conventional anchorage without any compromise on economy. Headed bar is formed by welding or threading a steel anchor at the end of beam reinforcement bar. This paper presents design and cost analysis of headed bars which can serve as anchorage for RC beam-column joints. It bestows a cost-effective and construction-efficient alternative to anchorage system of conventional development length. Design specifications in the form of geometrical recommendations for headed bars are made based on pull-out tests. The paper further derives the equation of development length and demonstrates cost-effectiveness of headed bars through rigorous cost analysis and comparison with costing of anchorage system of conventional development length for different rebar diameters.
Design and Cost Analysis of Headed Bars as Mechanical Anchorage System for Reinforced Concrete Beam-Column Joints
https://orcid.org/http://orcid.org/0000-0003-2779-9011
https://orcid.org/http://orcid.org/0000-0001-6595-2465
In reinforced concrete (RC) frames, anchorage system of conventional development length and standard 90º or 180º bend hooked bar anchor terminating at the joint, protruding into the face of the column, have many drawbacks such as reinforcement congestion, improper concreting and compaction, honeycombing, which ultimately leads to joint strength deterioration and joint damage during the earthquakes. Moreover, development length requires high amount of steel, which leads to depletion of natural resources, along with increased cost. This evolved need for development of alternate anchorage systems such as headed bars, which have the potential to eliminate the shortcomings of conventional anchorage without any compromise on economy. Headed bar is formed by welding or threading a steel anchor at the end of beam reinforcement bar. This paper presents design and cost analysis of headed bars which can serve as anchorage for RC beam-column joints. It bestows a cost-effective and construction-efficient alternative to anchorage system of conventional development length. Design specifications in the form of geometrical recommendations for headed bars are made based on pull-out tests. The paper further derives the equation of development length and demonstrates cost-effectiveness of headed bars through rigorous cost analysis and comparison with costing of anchorage system of conventional development length for different rebar diameters.
Design and Cost Analysis of Headed Bars as Mechanical Anchorage System for Reinforced Concrete Beam-Column Joints
Lecture Notes in Civil Engineering
Shukla, Sanjay Kumar (editor) / Raman, Sudharshan N. (editor) / Bhattacharjee, B. (editor) / Singh, Priyanka (editor) / Singhal, Shubham (author) / Chourasia, Ajay (author) / Rai, Pallavi (author)
International Conference on Trends and Recent Advances in Civil Engineering ; 2022 ; Noida, India
2023-06-22
11 pages
Article/Chapter (Book)
Electronic Resource
English
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