Modeling Studies of High-rise Structure Demolition Blasting with Multi-folding Sequences
According to an engineering practice, which is about demolishing a reinforced chimney of 100m high with multi-folding method blasting sequence in Guangzhou Paper Factory, discrete multi-body system dynamics analysis (DMBA) has been proposed and verified, which can describe high-rise structure dynamics moving after initial destabilization to falling to the ground. The equations of DMBA are composed of dynamics equations of multi-body system with variable topology and of discrete body system. The n-folding chimney dynamics movement in space is described by dynamics equations of multi-body system with variable topology at period of toppling in a whirl and disintegrate moved after initial instability. The bodys mass movement in topological period was modeled numerically by computing the equations and forces between bodies by inverse compulation in order to determine bodys disintegration. Changing topology involves in time points of blasting the cuts with delay sequences, displace of closing cuts and dynamic ?changes of the points in the chimney discrete. After the disintegration of the blasted body, it is produced that downward movement of discrete bodies (single or multi-body) is described by discrete body system dynamics equations for such actions as body separation, steel pulling, crashing and sliding, collapsing and piling up processes of the chimney body. The displacement of topological changing of closing the cuts created the initial conditions for the multi-body system to disintegrate. The above description of the model has been demonstrated correctly by surveying the muck pile of the blasting result.
towering structure demolition blasting numerical simulation multi-body dynamics with variable topology discrete element
ZHENG Bingxu WEI Xiaolin
Guangdong Handar Blasting Engineering Co. , Ltd., Guangzhou, 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
326-332
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）