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A Study on Progressive Collapse Behavior of Steel Structures Subjected to Fire Loads

Affiliations

  • Structural Engineering, SMBS, VIT University, Chennai Campus, Chennai - 600127, Tamil Nadu, India

Abstract


Progressive collapse is one of the main reasons for the failure of structure. It occurs due to removal/ damage of a column or a shear wall by fire, blast or vehicle impact. In this study, aG+7 moment resisting steel frame residential building was analysed using ETABS to predict the sensitivity of the structure to progressive collapse due to fire loads. Columns at different levels were given a temperature of 550̊ C with reduced material properties and yield strength as per code IS 800. Progressive collapse load combination was adoptedas per GSA guidelines. Corner, edge, intermediate and re-entrant columns were removed separately at alternate storeys. The lower storeys were found to be more susceptible than the upper storeys. The structure may be redesigned to avoid progressive collapse, with a significant increase in steel consumption. This study can be useful for important structures..

Keywords

ETABS, Fire Load, GSA Guidelines, Moment Resistingsteel Frame, Progressive Collapse.

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