钢筋混凝土高烟囱定向爆破拆除倒塌过程研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (9) : 197-201.

论文

钢筋混凝土高烟囱定向爆破拆除倒塌过程研究

言志信1,2; 叶振辉1,2; 刘培林1,2; 曹小红1,2

作者信息 +

Research of collapsing process of high reinforced concrete chimney blasting demolition

Yan Zhi-xin1, 2; Ye Zhen-hui1, 2; Liu Pei-lin1, 2; Cao Xiao-hong1, 2

Author information +

文章历史 +

摘要

烟囱爆破拆除无论是拆除高度还是拆除难度都在日益增大。运用动力学原理建立了钢筋混凝土烟囱在爆破后余留支撑部的应力模型，分析了切口中性轴的变化规律和决定因素，提出用冲压系数来考虑突加载荷的影响。进而采用共用节点分离式模型，利用ANSYS/LS-DYNA有限元软件对钢筋混凝土烟囱倒塌过程进行了数值模拟研究。通过对混凝土和钢筋单元应力-时程曲线的分析，指出共用节点分离式模型能够较好地反映钢筋和混凝土两种材料的力学性能差异。

Abstract

Both the height and the difficulty of chimney blasting demolition are increasing gradually. This paper establishes stress models of the supported segment of the remaining based on dynamic principle, and analyzes the regulation and the determining factor of the variation of cut neutral axis. The punching factor is used to consider with influence of sudden load. We adopt the node-split reinforced concrete model, and make the numerical simulation study of the reinforced concrete chimney collapse process by means of ANSYS/LS-DYNA. Through the analysis of the stress-time curve of reinforced concrete element, it is indicated that a node split model can reflect the difference of the mechanical properties between materials of steel and concrete.

导出引用

言志信;叶振辉;刘培林;曹小红;. 钢筋混凝土高烟囱定向爆破拆除倒塌过程研究[J]. 振动与冲击, 2011, 30(9): 197-201

Yan Zhi-xin;;Ye Zhen-hui;;Liu Pei-lin;;Cao Xiao-hong;. Research of collapsing process of high reinforced concrete chimney blasting demolition[J]. Journal of Vibration and Shock, 2011, 30(9): 197-201