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This paper presents a numerical procedure for analysing the progressive collapse of reinforced concrete (RC) moment resisting frame structures due to surface blast loads, addressing the gap in current methodologies. Traditional approaches such as the Alternate Load Path method, which are code-based and threat-independent, mainly focus on sudden column loss scenarios but do not fully capture the dynamic nature of blast-induced, threat-dependent collapses. This study employs a comprehensive numerical investigation using Finite Element Method where a seven-storeyed RC building is assessed for progressive collapse under blast loading. The progressive collapse analysis, focusing on perimeter blast scenarios and excluding internal explosions, is conducted with the ETABS software according to the General Services Administration’s (GSA) Linear Static Procedure, using a nonlinear direct integration time history analysis for blast impact. Different blast parameters, including charge weight and standoff distances, are varied to evaluate their impact on the structural integrity of the building. The Demand Capacity Ratios (DCR) of columns are calculated to determine failure potential, with a DCR greater than 1 indicating failure. The numerical model is validated against the GSA baseline model for the threat-independent analysis. Threat-independent analysis shows that 30–60% of columns exceed the acceptable DCR threshold, while threat-dependent scenarios result in 100% exceedance. This research also identifies critical columns and potential weak points for collapse initiation where for threat-independent analysis, those directly above the removed column and on the topmost floor and for threat-dependent analysis, ground floor columns adjacent to the removed column. Blast-induced progressive collapse analysis results in significantly higher DCRs compared to threat-independent analysis. This study enhances the understanding of structural dynamics under blast loads and provides a framework for analysing progressive collapse in RC buildings, highlighting the significance of scenario-based planning.

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Numerical Simulation of Progressive Collapse of Moment Resisting Frame Structures Under Surface Blast Loads

  • 会议论文

  • 发表日期：

    2025年

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  • N. T. Vandabona,
  • P. L. N. Fernando

摘要

This paper presents a numerical procedure for analysing the progressive collapse of reinforced concrete (RC) moment resisting frame structures due to surface blast loads, addressing the gap in current methodologies. Traditional approaches such as the Alternate Load Path method, which are code-based and threat-independent, mainly focus on sudden column loss scenarios but do not fully capture the dynamic nature of blast-induced, threat-dependent collapses. This study employs a comprehensive numerical investigation using Finite Element Method where a seven-storeyed RC building is assessed for progressive collapse under blast loading. The progressive collapse analysis, focusing on perimeter blast scenarios and excluding internal explosions, is conducted with the ETABS software according to the General Services Administration’s (GSA) Linear Static Procedure, using a nonlinear direct integration time history analysis for blast impact. Different blast parameters, including charge weight and standoff distances, are varied to evaluate their impact on the structural integrity of the building. The Demand Capacity Ratios (DCR) of columns are calculated to determine failure potential, with a DCR greater than 1 indicating failure. The numerical model is validated against the GSA baseline model for the threat-independent analysis. Threat-independent analysis shows that 30–60% of columns exceed the acceptable DCR threshold, while threat-dependent scenarios result in 100% exceedance. This research also identifies critical columns and potential weak points for collapse initiation where for threat-independent analysis, those directly above the removed column and on the topmost floor and for threat-dependent analysis, ground floor columns adjacent to the removed column. Blast-induced progressive collapse analysis results in significantly higher DCRs compared to threat-independent analysis. This study enhances the understanding of structural dynamics under blast loads and provides a framework for analysing progressive collapse in RC buildings, highlighting the significance of scenario-based planning.