Numerical Modeling of Demolition Blasting of Frame Structures by Varying-topological Multibody Dynamics
Using an actual demolishing example of Guangzhou Hengyun Power Rants frame building, this paper proposes a numerical modeling method using varying-topotogical multi-body dynamics for the movement of a collapsing building, from the moment of initial instability to touching the ground. The dynamic movement of n (generally, n = 3) degrees of freedom of framed body, which is composed of beams, posts and boards in space, starting from initial instability to toppling in a whirl and disintegrating is described by dynamical equations of varying-topological multi-bodies. Bodies movement in topological period is simulated numerically by computing the equations and forces between bodies of given degrees of freedom by inverse computing, then body disintegration is judged by its failure criteria. Changing topology involves in time point of delay blasting posts and dynamical changing point of body discrete. Frame structure movement is fallen down and follows approximately the moving law of quality centre after behind pillar blasting to on ground. Thin and long back pillars are crashed to ground and broken into two pieces. Frame structure continues to move, which is modeled by multi-body to front toe crashing to ground. If the structure is broken away from back pillar, the motion of the structure can be simulated by discrete body. The process described above has been demonstrated correctly by surveying the example, that a framed structure is demolished by blasting in Guangzhou Hengyun Power Plant. The error between modeling and field surveying is less than 10％ and this is acceptable by engineering. The varying-topological multi-body dynamics can be applied to predict the results of demolishing structured frames by blasting.
framed structure demolition blasting numerical simulation varying topologkal multi-body dynamics
WEI Xiaolin FU Jianqiu WANG Xuguang
Guangdong Handar Blasting Engr. Co. Ltd., Guangzhou, China;University of Science and Technology Beij University of Science and Technology Beijing, Beijing, China
国际会议
The Asian-Pacific Symposium on Blasting Techniques(亚洲太平洋地区爆破技术研讨会)
昆明
英文
333-339
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）