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  Volume 6, Number 4, October 2021 , pages 257-278

Study on non-linear static behavior of 2D low-rise RCC framed structure subjected to progressive collapse
Tariq Ahmad Sheikh, J.M. Banday and Mohammed A. Hussain

    In this study, the progressive collapse behavior (full load and displacement control methods) of low-rise models representing 2-bay2storey and 3-bay3storey reinforced concrete framed structures located in high seismic zone, designed by Indian codes (IS 456:2000 and IS 1893-2016) for envelope loading combination are assessed with and without U.S. General Services Administration (GSA) guidelines. For displacement-controlled mechanism, a target displacement of 2%, 4% and 5% of the height of structure are considered. Non-linear static behavior of the structure is investigated through (a) Hinge formation pattern (b) Displacement of Joints adjacent to removed column along x-axis and z-axis (c) and Pushdown capacity curves. The results indicate that the Hinge formation patterns are similar for envelope loading combination and GSA loading combination, and the accuracy of the displacement-controlled method is much remarkable compared to full load method, therefore a standard formula is obligatory for calculating the target displacement to control progressive collapse, based on structural requirements unlike the dynamic increase factor calculations based on the structural capacity. With increase in each span and height of structure consecutively, pushdown capacity curves indicate that the base shear increases approximately by two times whereas the displacement in downward direction reduces by 59% and 62.4% for corner column removal and middle column removal cases respectively.
Key Words
    displacement-controlled method; envelope loading combination; full load-controlled method; nonlinear static analysis; progressive collapse; U.S. General services administration (GSA) Guidelines
Tariq Ahmad Sheikh:Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, India

J.M. Banday:Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, India

Mohammed A. Hussain:Department of Civil Engineering, I.S.L Engineering College, Bandlaguda, Chandrayangutta, Hyderabad, Telangana, India

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