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Journal of Geotechnical Engineering Original Research

Structural Integrity Analysis of Reinforced Concrete Frames Under Progressive Collapse Scenarios

  1. Pragati Bibhishan Sirsat Department of Applied Mechanics, Government College of Engineering,, Aurangabad
  2. R. S. Londhe Department of Applied Mechanics, Government College of Engineering, Aurangabad, Chhatrapati Sambhajinagar

Abstract

This study examines how a tall reinforced concrete (RC) frame may gradually collapse under several column removal situations, such as edge, end, center, zigzag, and two-column failures. The study assesses the structural reaction based on displacement, inter-story drift, and Demand–Capacity Ratio (DCR) using nonlinear static pushover analysis carried out in ETABS. According to the analysis, the frame's stability is seriously jeopardized when two nearby columns and end columns are removed, which results in the highest degrees of displacement and drift. Due to the changed pathways for loads and a drop in lateral resistance such situations become the most vulnerable. Structurally, the Center and Zig-Zag column removal proposals work slightly better than the other two scenarios. The symmetrical design and balanced way in which loads are shared help a bridge withstand failure situations better. The structure stays within its elastic or near-elastic range in all circumstances because the DCR values stay below acceptable bounds (below 1.0), meeting the safety requirements set forth in GSA 2016 and IS 456:2000. To measure the reliability of structures, displacement and drift-based robustness indices are introduced to make a comparison across different failure cases. As well, the places where nonlinear behavior happens are recognised by studying the way plastic hinges are formed, as this shows where collapse might occur. All in all, the study proves that keeping structures connected and organized, as well as including extra supports, greatly reduce the chance of progressive collapse. The study gives structural designers knowledge to build safer and stronger reinforced concrete frames under different types of stresses.

Keywords

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