The present invention relates to an apparatus for measuring a deformation of a structure in accordance with an internal explosion load, comprising: a side wall portion of a hollow structure having upper and lower openings; a plurality of structural deformation measurement portions spaced apart from an outer side surface of the side wall portion; A structural specimen having An explosive disposed within the structural specimen; And a support frame having a downward beam structure having an upper portion of the support frame disposed outside the side wall portion and a lower portion of the support frame having a larger diameter than the upper portion of the support frame in a shape corresponding to the upper portion of the side wall portion.
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