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In this study, a blast demolition planning of buildings based upon the key element index, in which the contribution of a column to the strength of the buildings can be numerically evaluated, is developed. An Adaptively Shifted Integration (ASI) Gauss code is applied to blast demolition analyses of ten-story steel framed building models with different span numbers. Various selection schemes of blasted columns using the index were evaluated by comparing the efficiencies and levels of safety during demolition. The variances of key element index values were considered, in particular, to make a large difference in the distribution of the index values in each layer of the building. Most of the cases using the variance of index values showed a collapse motion in vertical direction, and the scattered distances of structural members were significantly suppressed.

DEVELOPMENT OF BLAST DEMOLITION PLANNING TOOL OF BUILDINGS BASED UPON KEY ELEMENT INDEX