钢筋混凝土高烟囱定向爆破拆除倒塌过程研究  

Collapsing process of high reinforced concrete chimney in blasting demolition

作　　者：言志信[1,2] 叶振辉[1,2] 刘培林[1,2] 曹小红[1,2] 

机构地区：[1]西部灾害与环境力学教育部重点实验室,兰州730000 [2]兰州大学土木工程与力学学院,兰州730000

出　　处：《振动与冲击》2011年第9期197-201,共5页Journal of Vibration and Shock

基　　金：甘肃省科技支撑计划项目(1011GKCA019);甘肃省建设科技攻关项目(JK2010-43)

摘　　要：烟囱爆破拆除无论是拆除高度还是拆除难度都在日益增大。运用动力学原理建立了钢筋混凝土烟囱在爆破后余留支撑部的应力模型,分析了切口中性轴的变化规律和决定因素,提出用冲压系数ks来考虑突加载荷的影响。进而采用共用节点分离式模型,利用ANSYS/LS-DYNA有限元软件对钢筋混凝土烟囱倒塌过程进行了数值模拟研究。通过对混凝土和钢筋单元应力-时程曲线的分析,指出共用节点分离式模型能够较好地反映钢筋和混凝土两种材料的力学性能差异。Stress models of the remained supporting segment of a high reinforced concrete chimney in blasting demolition was established based on dynamics principle.The regulation and the governing factors of the variation of neutral axis of cutting faces were analysed.The punching factor was used to consider the influence of sudden load.Adopting the node-split reinforced concrete model,the collapse process was numerically simulated by means of ANSYS/LS-DYNA.Through the analysis of the stress-time curve of reinforced concrete element,it is indicated that a node-split model can reflect the difference of the mechanical properties between materials of steel and concrete.

关 键 词：切口支撑部应力 钢筋混凝土高烟囱 分离式模型 爆破拆除 ANSYS/LS-DYNA 

分 类 号：O38[理学—流体力学]