横风向共振对高烟囱爆破倾倒方向的影响  

Effect of Across-wind Resonance Acted on Collapse Direction of High Chimney Blasting

作　　者：韩芳[1,2] 钟冬望[1,2] 龚相超[1,2] 

机构地区：[1]武汉科技大学理学院工程力学系,武汉430081 [2]武汉科技大学冶金工业过程系统科学湖北省重点实验室,武汉430081

出　　处：《爆破》2012年第4期10-13,共4页Blasting

基　　金：国家自然科学基金项目(51108358;51174147)

摘　　要：在顺风向荷载的基础上建立横风向荷载作用下高烟囱爆破倾倒的力学模型,分析了横风荷载对高烟囱定向爆破倾倒方向的影响,得到爆破倾倒偏转角的计算公式,并以南昌电厂210 m高烟囱为例进行验证。计算表明,烟囱共振频带在4～6级风的风振频率区域,定向爆破倾倒偏转角和风向角(0°～30°)呈近似线性关系,随着风向角的增大,偏转角也随之增大,此外,考虑横风共振后倾倒偏转角显著增大,建议在设计爆破参数时应对横风荷载予以考虑。The mechanical model of high chimney under across-wind resonance was established based on the load along-wind. The effect of wind load on deflection angle of high chimney demolition was discussed. The formula of deflection angle was obtained from an example of a 210 m high chimney in Nanchang power plant. The resonance frequency band of chimney was no more than the range of 4 - 6 grade wind vibration frequency. The relationship between deflection angle and the wind direction（0 ° - 30 °） was approximate linear, namely the blasting deflection angle increased with the load direction. Furthermore, the effect of across-wind resonance should be take into considera- tion in blasting parameter design for high chimney.

关 键 词：横风向共振 高烟囱 定向爆破 风荷载 

分 类 号：TU746.5[建筑科学—建筑技术科学]