论文以高速摄影监测结果和数值模拟计算结果为基础，对钢筋混凝土烟囱爆破拆除倒塌过程和保留筒壁受力过程与状态进行了综合分析研究。烟囱倒塌过程经历了爆破切口形成、中性轴形成、定轴转动和塌落触地四个阶段，爆破切口形成后保留筒壁须有0.5s～3.0s的稳定阶段来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的短时间内保留筒壁均承受压应力，随着中性轴的形成出现受压区和受拉区；定向窗锐角顶点处具有较高的应力集中程度，最先发生破坏，且内侧承受的压应力大于外侧。研究成果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。
Abstract
Based on the high-speed photography monitoring results and numerical simulation results, the author analyzed and studied the collapse process and load-bearing process of reinforced concrete chimney by blasting demolition comprehensively. the collapse process of reinforced chimney experienced four stages that including the formation of blasting cut, the formation of neutral axis, fixed-axis rotation and collapsing touchdown, The remained supporting segment should have a stable stage of 0.5s～3.0s to ensure the formation of the neutral axis in the process of load redistribution. The remained supporting segment under compressive stress after the formation of a blasting cut, and this compressive stress state duration is very short. Then appeared the pressure areas and tensile region; the acute angle of directional window has the high degree of stress concentration, it be destroyed firstly, and the medial part has the larger compressive stress. Research results have important practical significance for improving the accurate theory of reinforced concrete chimney blasting demolition.
关键词
钢筋混凝土烟囱 /
爆破拆除 /
倒塌过程 /
受力过程 /
数值计算 /
高速摄影
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Key words
reinforced concrete chimney /
blasting demolition /
collapse process /
load-bearing process /
numerical simulation /
high speed photography
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