钢筋混凝土烟囱爆破拆除倒塌与受力过程研究  

Collapse process and load-bearing process of reinforced concrete chimney during blasting demolition

作　　者：褚怀保[1] 徐鹏飞[2] 叶红宇[1] 杨小林 

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]中国矿业大学,北京100083

出　　处：《振动与冲击》2015年第22期183-186,198,共5页Journal of Vibration and Shock

基　　金：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

摘　　要：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。Based on the high-speed photography monitoring results and numerieal 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.

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 

分 类 号：O389[理学—流体力学]