On the demolition works of steel buildings which reach their durable peri 〔 )d , the blasting demolition method might be very effective . In order to control the demolition of steel buildings safely and surely , it is necessary that the minimum amount of high explosives can be estimated , Theref { )re , as 【 he basic smdy which probes the impact f士acture mechanisms of H − sh 叩 ed steel columns with shaped charges , we prepared the shaped charges , whose design parameters are materials of hners,

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... and obtained 1he contrOI of 1he cutting and removal of H − shaped steels through many experiments . And we are based upon the photograph with a high speed camera , measured cutting behaviors and plastic def { )rmatio 騒 s of H − shaped steel columns ,