Analysis Of Buildings Collapsing By Blasting Demolition And Touchdown Vibration Response

In recent years, with the pace of change continues to accelerate themodernization, a large number of towering building, frame structure and bridgeengineering need to be removed. Blasting method becomes one of the mostcompetitive method of demolition industry because of its simple and quick, efficientand economical. However, large-scale applications in Blasting also exist manyproblems. After blasting structural collapse led to the collapse of ground vibration,because the vibration frequency is closer to the natural frequency of the building thanblasting explosives, the safety of the surrounding buildings need attention and thecontrol of slumping touchdown vibration is necessary. Theoretical studies ofcontrolled blasting is far behind engineering practice. The whole process simulationbefore the removal can master the whole process in advance. It greatly compensatesfor the inadequacy of the theory and has great significance to the feasibility study ofthe blasting schemes.This article describes the research status demolition blasting and commonnumerical analysis method, also explained the importance of the slump touchdownvibration research, a brief summary of the propagation of the shock wave and thecurrent vibration safety standards. According to Zhou Jiahan Institute of blastingvibration studies touchdown slump order of removal, the use of LS-DYNA dynamicfinite element software, the first combination of Southlake compaction engineering tosimulate actual test data, the feasibility of the simulation method by comparing theresults of validation and reasonable. On this basis, the establishment of a finiteelement model of chaotic demolition blasting sun overhead and a nine-story shoppingmall frame structure, calculated slump touchdown and propagation of vibrationcurves are basically consistent with the actual structure.Through finite element simulation of three kinds of collapse vibration, we getvibration curves of ground medium under three ground vibration source. According tothe security uniform velocity in safety regulations, we discuss the universality of thesafety standards of common masonry structural residences under the action ofmorphology vibrations. Through respective numerical calculations, the residences are basically safe. It’s affirmed the use of our existing safety procedures in the field ofslumping touchdown vibrations. But it can’t be used as safety standards.