The Influence of Moment Redistribution on the Optimization of Beam Reinforcement in Multistorey Structures
Chaitali Bangar1, Roshni John2
1Chaitali Bangar, Department of Civil Engineering, Mumbai University, Pune (Maharashtra), India.
2Prof. Roshni John, Associate Professor, Department of Civil Engineering, Saraswati College of Engineering, Navi Mumbai (Maharashtra), India.
Manuscript received on 29 October 2024 | First Revised Manuscript received on 11 November 2024 | Second Revised Manuscript received on 19 November 2024 | Manuscript Accepted on 15 January 2025 | Manuscript published on 30 January 2025 | PP: 8-13 | Volume-13 Issue-5, January 2025 | Retrieval Number: 100.1/ijrte.E817813050125 | DOI: 10.35940/ijrte.E8178.13050125
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The redistribution of design bending moments in continuous reinforced concrete beams is widely acknowledged as a valuable resource for designers of reinforced concrete structures. Moment redistribution is beneficial for practical design, as it provides flexibility in reinforcement arrangement. According to IS 13920:2016, the minimum reinforcement at the bottom face of the beam at support locations must be 50% of the top reinforcement at the same point. At the same time, it should be no less than 25% of the support reinforcement at midspan to meet ductility requirements. In detailing the junctions between columns and beams, the author has noted that congestion of reinforcement at the column faces of the beams poses practical challenges when placing both longitudinal and transverse rebars for the columns. This congestion can lead to inadequate concrete compaction, increasing the risk of honeycombing. By redistributing the top moment in the beam at the support location to the bottom face at midspan, it becomes possible to reduce both the top and bottom reinforcement at the supports, thus optimizing the reinforcement allocation in beams. This study examines a three-dimensional G+20-storey building, which includes both laterally stiffened and unstiffened designs with symmetrical plans. The entire structure is situated in zone III on medium soil conditions, incorporating partial moment releases. The percentages of moment redistributed in the beams were determined at 10%, 20%, and 30% for the laterally unstiffened structure, and 10% for the laterally stiffened structure. Following this, a response spectrum analysis was performed using STAAD Pro. By IS 13920:2016, comparisons were made between the beams’ top and bottom-face longitudinal reinforcement across various moment redistribution values
Keywords: Building With and Without a Shear Wall, Moment Redistribution in Beams, Longitudinal Reinforcement in Beam
Scope of the Article: Structural Engineering