Analysis And Experimental Research Of Frame Structure Buildings Due To Blasting Collapse

As a special demotion method, blasting demolition is widely used in the urbanbuildings demolition projects. It’s a hot and difficult problem quantitative analysis theblasting collapse process of frame structure building in the field.Based on the frame structure buildings as the main research object, this papersummarize the internal force calculation method of framework structure under horizontalload and vertical load and the bearing capacity calculation under different load; Comparedthe current critical blasting height calculation method and advantages under severaldifferent models; besides, the approximate analytical solution of dynamic equation ofsingle span frame structure dumping, multi span frame beam step fallen and frame columnbottom dumping has been studied.Combined the blasting demolition project of Hanyang ICBC, the paper use thehigh-speed photography technology and numerical simulation to analyze the instabilityprocess of the frame structure building collapsed. Building the model with SOLID164entity unit, in the follow-up of equivalent strength hardening material to simulate thefailure destruction process of reinforced concrete, the results of collapse attitude, collapsetime and the scope agree with the actual situation. Using high speed camera todynamically monitoring the frame structure building collapse process, adopting the imagepoints in picture processing technology to research the particle movement regular in thestructure collapse process, and obtained the image curves of displacement, velocity,acceleration and structure fixed axis rotation of the particles in the collapse process, anddivide the frame structure collapse process into dour stages: blasting cut formation stage,blasting cut closure stage, dumping disintegration stage, collapse accumulation stage.