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《Journal of Vibration and Shock》 2015-22
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Collapse process and load-bearing process of reinforced concrete chimney during blasting demolition

CHU Huai-bao;XU Peng-fei;YE Hong-yu;YANG Xiao-lin;College of Civil Engineering,Henan Polytechnic University;China University of Mining &Technology;  
Based on the high-speed photography monitoring results and numerical simulation results,the collapse process and load-bearing process of reinforced concrete chimney during blasting demolition were analysed comprehensively. The collapse process of reinforced chimney experiences four stages,including the formation of blasting cut,formation of neutral axis,fixed-axis rotation and collapsing touchdown,the remained supporting segment should have a stable stage of 0. 5 ~ 3. 0 s to ensure a steady formation of the neutral axis in the process of load redistribution. The remained supporting segment retains a short duration of compressive stress state after the formation of a blasting cut,and then compressive areas together with tensile regions will appear. At the top point of the acute angle of directional window,there is high degree of stress concentration,so,here,the structure will be destroyed at first,and at the medial part larger compressive stress exhibits. The results have important practical significance for improving the theory of accurate blasting demolition of reinforced concrete chimneys.
【Fund】: 国家自然科学基金项目(50874039);; 河南省骨干教师资助项目;; 河南理工大学骨干教师资助项目;河南理工大学博士基金
【CateGory Index】: TU746.5
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