混凝土烟囱爆破拆除的下坐及早期断裂预测

Prediction of sinking down and early breaking for blasted reinforced concrete chimney

摘要: 钢筋混凝土烟囱爆破拆除时发生的下坐与空中断裂现象严重影响工程安全，为分析该现象发生的机制并对其进行判别，开展了180m烟囱下坐和空中断裂过程的观测和分析。基于混凝土的压缩全应力应变曲线特征分析了支撑区的破坏过程，构建了烟囱的失稳下坐判别模型。通过建立底部冲击作用下烟囱的动力响应模型，分析了下坐冲击产生的附加动应变在烟囱中的传播特征。研究结果表明，考虑混凝土全应力应变曲线特征和支撑区横截面应力和应变分布特征的倾覆力矩与抵抗力矩的比值f可作为失稳下坐的
- 钢筋混凝土烟囱 /
- 爆破拆除 /
- 空中断裂 /
- 下坐 /
- 预测模型
Abstract: The support part collapse and breaking in air of reinforced concrete chimney during blasting demolition seriously affect the engineering safety. To analyze the mechanism of these phenomenon and distinguish them, the monitoring and analysis of a 180m chimney were carried out. Based on the characteristics of the full stress-strain curve of concrete, the progressive failure process of the support part is analyzed, the static equation of the cross section is constructed, and the discrimination model
- reinforced concrete chimney /
- blasting demolition /

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