Multibody-Discretebody Dynamics to Control Building Demolished by Blasting

摘要

The course of the development of science and technology of building demolished by blasting is described.The Building Toppling Dynamics,which includes to Multibody-discretebody Dynamics,is defined.It is stands out that the dynamic characteristic is difference from traditional multi-body system.The dynamic equations are erected.The examples of its representative equations of demolition are enumerated.Their analytic and approximate solutions are obtained.The dynamic equations similarity and applications of dimensionless of standard and regularity are advanced.The complete chessboard emulating of variable topological Multibody-Discretebody Dynamics is realized.The parameters about disrepair material mechanics and impact dynamics of concrete component concerned for equation compute are clarified.It has been demonstrated by field observation and engineering examples that Building Toppling Dynamics,which includes to Multibody-Discretebody Dynamics,is correct.Applied the Multi-body Dynamics of the author,the dimensionless expression of cutting size of incision,cheap of exploded heap(its front wide and height),recoil,sitting down(example: single rear post),burst order and blasting time difference (with the aid of single incision closure) of many collapse manners of many kinds buildings have been simply educed by the demolition model.In order to select reasonable toppling manners,demolition measurements and incision parameters,new comprehensive theory and simple practical algorithm for general are provided and it has been proven by engineering practical examples that exact control of demolition with blasting can be achieved by MBDC.However,the Multibo dy-Discretebody Dynamics is new scientific developing stage of demolition by blasting.