Effect of hanger system on resistance against progressive collapse of RC buildings under column removal in alternate storeys

Abstract

Progressive failure refers to the continuous disintegration of a structure until partial or complete collapse, resulting in severe economic losses and mass casualties. The present study proposes a feasible solution against progressive collapse by the introduction of a hanger system and highlighting its effect on R.C. building under the progressive collapse scenario. The hanger system mainly comprises of a structural wall enacted at the terrace level in place of the parapet wall, which acts as a highly stiff member connecting the columns in various bays and allowing load transfer between these bays, thus creating an alternate path for loads. This study follows the removal of various critical columns on the alternate storeys, in contrast to previously conducted researches which were focused on only removing selected columns on the ground storey. CSI's ETABS 19 software has been used to simulate the progressive collapse of a reinforced concrete building, assessing the behaviour of a 10 storey reinforced concrete building under progressive collapse, with and without designing structural wall at the parapet, using static linear analysis of progressive collapse compliant with the general service administration guidelines (2016). In all the cases of removal of critical columns, the results are compiled in respect of DCR values (Demand Capacity Ratio) at critical locations and joint displacement at the top of removed columns. The hanger system used in this study provides an innovative and feasible solution to prevent progressive collapse by providing alternate load paths and increasing the robustness of the building.