Close-range Photogrammetry Analysis Of Building-collapse Due To Blasting Demolition

The research, close-range photogrammetry analysis of building-collapse due to blasting demolition, is a typical interdisciplinary subject, which relate to the three branches of close-range photogrammetry, computer vision and blasting demolition. The significance of this subject is to introduce the technology of close-range photogrammetry to the region of blasting engineering. In order to analysis the progress of building-collapse due to balsting deolition quantitatively, camara is used as eyes, and coputer is used as brain, there to sum up experience and listen to lessons and open out mechanical mechanism, which are benefit to the perfect practice of blasting demolition engineer for the future.In order to realize the aim, analysising building-collapse due to blasting demolition by the technology of close-range photogrammetry, there are three main steps. Firstly, the structure of this testing system is designed, and then be refined from data flow and framework design of the program. And then, the process of movement, the transformation of energy, the distribution of fragment and the mechanis of dynamics are dicussed sequently by this photogrammetry system. According to the analysis from the four aspects above, the system is optimized to reduce error and avoid shortcomings of the original program, and the research is summed and looked forword at last.The contents of this subject are as follow:(1) The subject, close-range photogrammetry analysis of building-collapse due to blasting demolition, which comes from engineering practices, is a link of theoretic analysis, experimential research and digital simulation, which are the three main branches in the region of engineering blasting. And this method is benefit for summing up experience from practices, and then can promote the level of the technology of blasting demolition by the circulate system of PDCA (Plan, Do, Check, Action). For a comprehensive study, the references about close-range photogrammetry, computer vision and blasting demolition are all collected and analyzed, and the framework of the research is formed at the same time.(2) According to the characteristics of non-metric camera and demolition blasting, the fit theory and method about photogrammetry analysis are be selected. And the framework and operational steps of this close-range photogrammetry technology are analyzed in the three aspects, which are image collection, image process and data postprocess with speciality acknowledge.(3) Based on the analysis of data flow and framework design of the program, the system of close-range photogrammetry is be refined from the three aspects (idea design, module design and optimization design), and then form a digital and module programme.(4) By the the technology of close-range photogrammetry, the movement track of building during the process of blasting demolition is measured. And the function of this system is to translate the two-dimension data in photo ordinariate to the three-demension in realistic ordinariate.(5) By the system of close-range photogrammetry, the transformation and dissipation of energy in the process of building-collapse is measured directly, and then the disaggregation of the building and the vibration of the ground due to the shock of building-collapse can be analyzed expediently, and which avoided the complicated process-analysis with shock dynamics.(6) By the system of close-range photogrammetry, the distrubtion of fragment of the building demolished with explosives is discussed, and the distrubtion of fragment depends on the movement trace of the dumping building in air and the shock-process to the ground.(7) Based on the movement data of dumping building, which got by the system of close-range photogrammetry, the mechanical mechanism in the dumping process of building demolished with explosives is analyzed by the theory of multibody-discretebody dynamics.(8) According the practices analyzed by this system in recent years, the system is optimized to reduce error and avoid shortcomings of the original program. And the error of initial evaluation, photography orientation and tracing marking-points all can be mined or avoided through the technology of camera calibration and image matching.