烟囱定向爆破拆除倒塌过程

言志信; 叶振辉; 刘培林

doi:10.11883/1001-1455(2010)06-0607-07

烟囱定向爆破拆除倒塌过程

doi: 10.11883/1001-1455(2010)06-0607-07

1.
西部灾害与环境力学教育部重点实验室,甘肃兰州730000;
2.
兰州大学土木工程与力学学院,甘肃兰州730000

详细信息

通讯作者:
叶振辉

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出版历程
- 刊出日期: 2010-11-25

Collapsingprocessofchimneydemolitionbydirectionalblasting

1.
KeyLaboratoryof MechanicsonDisasterandEnvironmentin WesternChina,
2.
TheMinistryofEducationofChina,Lanzhou730000,Gansu,China;

More Information

Corresponding author: YE Zhen-hui

摘要

摘要: 针对烟囱爆破拆除,通过建立烟囱倒塌的力学模型,运用数学方法推演了烟囱最大弯矩区域和最大剪应力区域。此外,采用有限元软件ANSYS/LS-DYNA 对烟囱倒塌过程进行了数值模拟,并与实际倒塌过程相比较。数值模拟结果表明,在距离地面约1/3、1/2和2/3处,筒体有应力集中现象,这些部位在烟囱倒塌过程中容易折断,这与理论分析和实际过程相吻合。烟囱折断发生的位置和时间与筒体的切口形状和筒体材料的力学性能密切相关,砖烟囱和钢筋混凝土烟囱的力学性能存在明显的差异。
- 爆炸力学 /
- 力学模型 /
- ANSYS/LS-DYNA /
- 烟囱 /
- 爆破拆除
Abstract: Thebasicprinciplesofchimneyblastingdemolitionwereintroduced.Aimedtothecollapsingprocessofchimneys, themechanicalmodelsweredevelopedtoderivethelargestrangesofchimneybendingmomentandshearstressbythemathematicalmethods. Andthecollapsingprocessesof chimneysweresimulatednumericallybyusingthefiniteelementsoftwareLS-DYNA3Dandthesimulatedresultswerecomparedwiththeactualcollapsingprocessofchimneys. ItisrevealedthatthefiniteelementsoftwareLS- DYNA3Dcanbeusedtostimulatethecollapsingprocessofchimneyblasting, forinstance,thepartsatthedistancesfromthegroundabout1/3,1/2,and2/3,wherethere arestressconcentrationphenomena,areeasilytobebrokenduringthecollapsingprocess.Thebroken partandtimeofthechimneylinkscloselytothecuttingshapeandthephysicalandmechanicalpropertiesofthestructureitself. Thereisobviousdifferencebetweenthebrickchimneyandreinforcedconcretechimney.
- mechanicsofexplosion /
- mechanicalmodel /
- ANSYS/LS-DYNA /
- chimney /
- blastingdemolition