Extension of the Modal Pushover Analysis to Assess Structures Exposed to Blast Load: Fid-Bau Portal

Extension of the Modal Pushover Analysis to Assess Structures Exposed to Blast Load

Saedi-Daryan, Amir / Soleimani, Sahman / Hasanzadeh, Masoud

Blast-load effects on structures are notably dangerous, and the damage and destruction that they cause are considered a great threat to human lives. Nonlinear dynamic analysis (NDA) is recognized as an accurate method for analyzing structures under blast waves. However, because of the time-consuming nature of this analysis, a simple alternative method with a sufficient degree of accuracy is essential. This study aims to extend the concept of the well-known modal pushover analysis (MPA) to assess structures under blast loading. MPA is currently used to analyze structures under seismic excitation. In an earthquake analysis, forces are distributed over the height of the structure in proportion to the mass concentration. However, in the blast-loading scenario, the distribution of forces on the building depends on the magnitude and location of explosion, regardless of the mass distributions. Based on these differences, the fundamental formulations of the MPA are modified, and a step-by-step procedure is accordingly proposed. The effectiveness of the proposed procedure is assessed by examining an eight-story shear-wall structure. The results show that the proposed procedure is sufficiently accurate in comparison with the exact NDA.