摘要
在烟囱爆破拆除倒塌过程中,不同形式的风可使烟囱产生顺风向效应及横风向效应。横风向效应又包括横风向旋涡脱落及共振效应、横风向空气动力失稳。烟囱在风的长期作用下会发生失稳倾斜。揭示了爆破拆除过程中烟囱由于风振影响而发生倾斜、失稳的机理,分析了不同风向的三类风效应对爆破拆除时烟囱倒塌方向发生偏移的影响。根据分析计算结果可得,纵向风振影响最为显著,静力风效应影响相对较小,横向风振产生影响随机性较强。同时作者得出了爆破拆除烟囱时考虑风效应影响需采取的相应技术手段和措施。
In blasting demolition process of a chimney,along wind effect and across wind one are produced on the chimney under wind loads.The effect of across wind includes horizontal wind direction swirl,resonance effect and air dynamic destabilizing in horizontal wind direction.The long time action of wind load on a chimney during blasting demolition leads to sloping and destabilizing.The mechanism of sloping and destabilizing of a chimney due to wind-induced vibration in its blasting demolition process was presented,and the deviations of the chimney collapsing direction during blasting demolition as results of three kinds of wind effect in different directions were analyzed.It was shown from the calculation results that the influence of along wind resonance is significant,the static wind effect is relatively small,and the influence of across wind resonance has a little stronger randomness.Also,the relevant technological measures needed considering the effect of wind in blasting demolition process of a chimney were obtained.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第13期133-136,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(51178259)
中国博士后科学基金(2013T60681
2012M521364)
山东省高等学校科技计划项目(J11LE10)
青岛经济技术开发区重点科技计划项目(2012-2-49)
关键词
烟囱
风效应
爆破
基底弯矩
顶部位移
chimney
wind effect
blasting
base moment
top displacement
