CAJ | 학술논문

以高速摄影监测、数值模拟结果为基础，对钢筋混凝土烟囱爆破拆除倒塌过程及保留筒壁受力过程与状态进行综合分析研究。烟囱倒塌经历爆破切口形成、中性轴形成、定轴转动及塌落触地4阶段。爆破切口形成后保留筒壁须有0．5～3．0 s稳定阶段保证在荷载重新分布过程中中性轴的稳定形成。爆破切口形成后初始短时间内保留筒壁均承受压应力，随中性轴形成出现受压、受拉区；定向窗锐角顶点处应力集中程度较高，先发生破坏，且内侧承受压应力大于外侧。该研究对进一步完善钢筋混凝土烟囱精确爆破拆除理论具有重要的现实意义。
이고속섭영감측、수치모의결과위기출，대강근혼응토연창폭파탁제도탑과정급보류통벽수력과정여상태진행종합분석연구。연창도탑경력폭파절구형성、중성축형성、정축전동급탑락촉지4계단。폭파절구형성후보류통벽수유0．5～3．0 s은정계단보증재하재중신분포과정중중성축적은정형성。폭파절구형성후초시단시간내보류통벽균승수압응력，수중성축형성출현수압、수랍구；정향창예각정점처응력집중정도교고，선발생파배，차내측승수압응력대우외측。해연구대진일보완선강근혼응토연창정학폭파탁제이론구유중요적현실의의。
Basedonthehigh-speedphotographymonitoringresultsandnumericalsimulationresults,thecollapse 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.